diff --git a/Tests/LinuxMain.swift b/Tests/LinuxMain.swift
index 1192d74f..27b4e20a 100644
--- a/Tests/LinuxMain.swift
+++ b/Tests/LinuxMain.swift
@@ -31,76 +31,87 @@ import XCTest
    @testable import NIOTests
    @testable import NIOWebSocketTests
 
-   XCTMain([
-         testCase(AcceptBackoffHandlerTest.allTests),
-         testCase(AdaptiveRecvByteBufferAllocatorTest.allTests),
-         testCase(ApplicationProtocolNegotiationHandlerTests.allTests),
-         testCase(Base64Test.allTests),
-         testCase(BaseObjectTest.allTests),
-         testCase(BlockingIOThreadPoolTest.allTests),
-         testCase(BootstrapTest.allTests),
-         testCase(ByteBufferTest.allTests),
-         testCase(ByteBufferUtilsTest.allTests),
-         testCase(ByteToMessageDecoderTest.allTests),
-         testCase(ByteToMessageDecoderVerifierTest.allTests),
-         testCase(ChannelNotificationTest.allTests),
-         testCase(ChannelOptionStorageTest.allTests),
-         testCase(ChannelPipelineTest.allTests),
-         testCase(ChannelTests.allTests),
-         testCase(CircularBufferTests.allTests),
-         testCase(CodableByteBufferTest.allTests),
-         testCase(CustomChannelTests.allTests),
-         testCase(DatagramChannelTests.allTests),
-         testCase(EchoServerClientTest.allTests),
-         testCase(EmbeddedChannelTest.allTests),
-         testCase(EmbeddedEventLoopTest.allTests),
-         testCase(EventCounterHandlerTest.allTests),
-         testCase(EventLoopFutureTest.allTests),
-         testCase(EventLoopTest.allTests),
-         testCase(FileRegionTest.allTests),
-         testCase(GetaddrinfoResolverTest.allTests),
-         testCase(HTTPClientUpgradeTestCase.allTests),
-         testCase(HTTPDecoderLengthTest.allTests),
-         testCase(HTTPDecoderTest.allTests),
-         testCase(HTTPHeadersTest.allTests),
-         testCase(HTTPRequestEncoderTests.allTests),
-         testCase(HTTPResponseEncoderTests.allTests),
-         testCase(HTTPResponseStatusTests.allTests),
-         testCase(HTTPServerClientTest.allTests),
-         testCase(HTTPServerPipelineHandlerTest.allTests),
-         testCase(HTTPServerProtocolErrorHandlerTest.allTests),
-         testCase(HTTPServerUpgradeTestCase.allTests),
-         testCase(HTTPTest.allTests),
-         testCase(HTTPTypesTest.allTests),
-         testCase(HappyEyeballsTest.allTests),
-         testCase(HeapTests.allTests),
-         testCase(IdleStateHandlerTest.allTests),
-         testCase(IntegerTypesTest.allTests),
-         testCase(MarkedCircularBufferTests.allTests),
-         testCase(MessageToByteEncoderTest.allTests),
-         testCase(MessageToByteHandlerTest.allTests),
-         testCase(MulticastTest.allTests),
-         testCase(NIOAnyDebugTest.allTests),
-         testCase(NIOCloseOnErrorHandlerTest.allTests),
-         testCase(NIOConcurrencyHelpersTests.allTests),
-         testCase(NIOHTTP1TestServerTest.allTests),
-         testCase(NonBlockingFileIOTest.allTests),
-         testCase(PendingDatagramWritesManagerTests.allTests),
-         testCase(PipeChannelTest.allTests),
-         testCase(PriorityQueueTest.allTests),
-         testCase(SNIHandlerTest.allTests),
-         testCase(SelectorTest.allTests),
-         testCase(SocketAddressTest.allTests),
-         testCase(SocketChannelTest.allTests),
-         testCase(SocketOptionProviderTest.allTests),
-         testCase(StreamChannelTest.allTests),
-         testCase(SystemTest.allTests),
-         testCase(ThreadTest.allTests),
-         testCase(TypeAssistedChannelHandlerTest.allTests),
-         testCase(UtilitiesTest.allTests),
-         testCase(WebSocketClientEndToEndTests.allTests),
-         testCase(WebSocketFrameDecoderTest.allTests),
-         testCase(WebSocketFrameEncoderTest.allTests),
-         testCase(WebSocketServerEndToEndTests.allTests),
-    ])
+// This protocol is necessary to we can call the 'run' method (on an existential of this protocol)
+// without the compiler noticing that we're calling a deprecated function.
+// This hack exists so we can deprecate individual tests which test deprecated functionality without
+// getting a compiler warning...
+protocol LinuxMainRunner { func run() }
+class LinuxMainRunnerImpl: LinuxMainRunner {
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
+   func run() {
+       XCTMain([
+             testCase(AcceptBackoffHandlerTest.allTests),
+             testCase(AdaptiveRecvByteBufferAllocatorTest.allTests),
+             testCase(ApplicationProtocolNegotiationHandlerTests.allTests),
+             testCase(Base64Test.allTests),
+             testCase(BaseObjectTest.allTests),
+             testCase(BlockingIOThreadPoolTest.allTests),
+             testCase(BootstrapTest.allTests),
+             testCase(ByteBufferTest.allTests),
+             testCase(ByteBufferUtilsTest.allTests),
+             testCase(ByteToMessageDecoderTest.allTests),
+             testCase(ByteToMessageDecoderVerifierTest.allTests),
+             testCase(ChannelNotificationTest.allTests),
+             testCase(ChannelOptionStorageTest.allTests),
+             testCase(ChannelPipelineTest.allTests),
+             testCase(ChannelTests.allTests),
+             testCase(CircularBufferTests.allTests),
+             testCase(CodableByteBufferTest.allTests),
+             testCase(CustomChannelTests.allTests),
+             testCase(DatagramChannelTests.allTests),
+             testCase(EchoServerClientTest.allTests),
+             testCase(EmbeddedChannelTest.allTests),
+             testCase(EmbeddedEventLoopTest.allTests),
+             testCase(EventCounterHandlerTest.allTests),
+             testCase(EventLoopFutureTest.allTests),
+             testCase(EventLoopTest.allTests),
+             testCase(FileRegionTest.allTests),
+             testCase(GetaddrinfoResolverTest.allTests),
+             testCase(HTTPClientUpgradeTestCase.allTests),
+             testCase(HTTPDecoderLengthTest.allTests),
+             testCase(HTTPDecoderTest.allTests),
+             testCase(HTTPHeadersTest.allTests),
+             testCase(HTTPRequestEncoderTests.allTests),
+             testCase(HTTPResponseEncoderTests.allTests),
+             testCase(HTTPResponseStatusTests.allTests),
+             testCase(HTTPServerClientTest.allTests),
+             testCase(HTTPServerPipelineHandlerTest.allTests),
+             testCase(HTTPServerProtocolErrorHandlerTest.allTests),
+             testCase(HTTPServerUpgradeTestCase.allTests),
+             testCase(HTTPTest.allTests),
+             testCase(HTTPTypesTest.allTests),
+             testCase(HappyEyeballsTest.allTests),
+             testCase(HeapTests.allTests),
+             testCase(IdleStateHandlerTest.allTests),
+             testCase(IntegerTypesTest.allTests),
+             testCase(MarkedCircularBufferTests.allTests),
+             testCase(MessageToByteEncoderTest.allTests),
+             testCase(MessageToByteHandlerTest.allTests),
+             testCase(MulticastTest.allTests),
+             testCase(NIOAnyDebugTest.allTests),
+             testCase(NIOCloseOnErrorHandlerTest.allTests),
+             testCase(NIOConcurrencyHelpersTests.allTests),
+             testCase(NIOHTTP1TestServerTest.allTests),
+             testCase(NonBlockingFileIOTest.allTests),
+             testCase(PendingDatagramWritesManagerTests.allTests),
+             testCase(PipeChannelTest.allTests),
+             testCase(PriorityQueueTest.allTests),
+             testCase(SNIHandlerTest.allTests),
+             testCase(SelectorTest.allTests),
+             testCase(SocketAddressTest.allTests),
+             testCase(SocketChannelTest.allTests),
+             testCase(SocketOptionProviderTest.allTests),
+             testCase(StreamChannelTest.allTests),
+             testCase(SystemTest.allTests),
+             testCase(ThreadTest.allTests),
+             testCase(TypeAssistedChannelHandlerTest.allTests),
+             testCase(UtilitiesTest.allTests),
+             testCase(WebSocketClientEndToEndTests.allTests),
+             testCase(WebSocketFrameDecoderTest.allTests),
+             testCase(WebSocketFrameEncoderTest.allTests),
+             testCase(WebSocketServerEndToEndTests.allTests),
+        ])
+    }
+}
+(LinuxMainRunnerImpl() as LinuxMainRunner).run()
 #endif
diff --git a/Tests/NIOConcurrencyHelpersTests/NIOConcurrencyHelpersTests+XCTest.swift b/Tests/NIOConcurrencyHelpersTests/NIOConcurrencyHelpersTests+XCTest.swift
index b952b960..bbe9292f 100644
--- a/Tests/NIOConcurrencyHelpersTests/NIOConcurrencyHelpersTests+XCTest.swift
+++ b/Tests/NIOConcurrencyHelpersTests/NIOConcurrencyHelpersTests+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension NIOConcurrencyHelpersTests {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (NIOConcurrencyHelpersTests) -> () throws -> Void)] {
       return [
                 ("testLargeContendedAtomicSum", testLargeContendedAtomicSum),
diff --git a/Tests/NIOFoundationCompatTests/Codable+ByteBufferTest+XCTest.swift b/Tests/NIOFoundationCompatTests/Codable+ByteBufferTest+XCTest.swift
index 1a4f23d7..5733169c 100644
--- a/Tests/NIOFoundationCompatTests/Codable+ByteBufferTest+XCTest.swift
+++ b/Tests/NIOFoundationCompatTests/Codable+ByteBufferTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension CodableByteBufferTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (CodableByteBufferTest) -> () throws -> Void)] {
       return [
                 ("testSimpleDecode", testSimpleDecode),
diff --git a/Tests/NIOHTTP1Tests/ByteBufferUtilsTest+XCTest.swift b/Tests/NIOHTTP1Tests/ByteBufferUtilsTest+XCTest.swift
index 48270965..98983637 100644
--- a/Tests/NIOHTTP1Tests/ByteBufferUtilsTest+XCTest.swift
+++ b/Tests/NIOHTTP1Tests/ByteBufferUtilsTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension ByteBufferUtilsTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (ByteBufferUtilsTest) -> () throws -> Void)] {
       return [
                 ("testComparators", testComparators),
diff --git a/Tests/NIOHTTP1Tests/HTTPClientUpgradeTests+XCTest.swift b/Tests/NIOHTTP1Tests/HTTPClientUpgradeTests+XCTest.swift
index 140e61f6..616c9ba7 100644
--- a/Tests/NIOHTTP1Tests/HTTPClientUpgradeTests+XCTest.swift
+++ b/Tests/NIOHTTP1Tests/HTTPClientUpgradeTests+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension HTTPClientUpgradeTestCase {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (HTTPClientUpgradeTestCase) -> () throws -> Void)] {
       return [
                 ("testSimpleUpgradeSucceeds", testSimpleUpgradeSucceeds),
diff --git a/Tests/NIOHTTP1Tests/HTTPDecoderLengthTest+XCTest.swift b/Tests/NIOHTTP1Tests/HTTPDecoderLengthTest+XCTest.swift
index 48b518ec..83a20ef0 100644
--- a/Tests/NIOHTTP1Tests/HTTPDecoderLengthTest+XCTest.swift
+++ b/Tests/NIOHTTP1Tests/HTTPDecoderLengthTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension HTTPDecoderLengthTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (HTTPDecoderLengthTest) -> () throws -> Void)] {
       return [
                 ("testHTTP11SemanticEOFOnChannelInactive", testHTTP11SemanticEOFOnChannelInactive),
diff --git a/Tests/NIOHTTP1Tests/HTTPDecoderTest+XCTest.swift b/Tests/NIOHTTP1Tests/HTTPDecoderTest+XCTest.swift
index fbdea2b7..54f1633c 100644
--- a/Tests/NIOHTTP1Tests/HTTPDecoderTest+XCTest.swift
+++ b/Tests/NIOHTTP1Tests/HTTPDecoderTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension HTTPDecoderTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (HTTPDecoderTest) -> () throws -> Void)] {
       return [
                 ("testDoesNotDecodeRealHTTP09Request", testDoesNotDecodeRealHTTP09Request),
diff --git a/Tests/NIOHTTP1Tests/HTTPHeadersTest+XCTest.swift b/Tests/NIOHTTP1Tests/HTTPHeadersTest+XCTest.swift
index 70b16d33..17a5f2ea 100644
--- a/Tests/NIOHTTP1Tests/HTTPHeadersTest+XCTest.swift
+++ b/Tests/NIOHTTP1Tests/HTTPHeadersTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension HTTPHeadersTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (HTTPHeadersTest) -> () throws -> Void)] {
       return [
                 ("testCasePreservedButInsensitiveLookup", testCasePreservedButInsensitiveLookup),
diff --git a/Tests/NIOHTTP1Tests/HTTPRequestEncoderTest+XCTest.swift b/Tests/NIOHTTP1Tests/HTTPRequestEncoderTest+XCTest.swift
index 868e4a67..cd8a96a8 100644
--- a/Tests/NIOHTTP1Tests/HTTPRequestEncoderTest+XCTest.swift
+++ b/Tests/NIOHTTP1Tests/HTTPRequestEncoderTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension HTTPRequestEncoderTests {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (HTTPRequestEncoderTests) -> () throws -> Void)] {
       return [
                 ("testNoAutoHeadersForHEAD", testNoAutoHeadersForHEAD),
diff --git a/Tests/NIOHTTP1Tests/HTTPResponseEncoderTest+XCTest.swift b/Tests/NIOHTTP1Tests/HTTPResponseEncoderTest+XCTest.swift
index 7a33e098..f5a4f2a2 100644
--- a/Tests/NIOHTTP1Tests/HTTPResponseEncoderTest+XCTest.swift
+++ b/Tests/NIOHTTP1Tests/HTTPResponseEncoderTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension HTTPResponseEncoderTests {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (HTTPResponseEncoderTests) -> () throws -> Void)] {
       return [
                 ("testNoAutoHeadersFor101", testNoAutoHeadersFor101),
diff --git a/Tests/NIOHTTP1Tests/HTTPResponseStatusTests+XCTest.swift b/Tests/NIOHTTP1Tests/HTTPResponseStatusTests+XCTest.swift
index 2a63506b..10799c74 100644
--- a/Tests/NIOHTTP1Tests/HTTPResponseStatusTests+XCTest.swift
+++ b/Tests/NIOHTTP1Tests/HTTPResponseStatusTests+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension HTTPResponseStatusTests {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (HTTPResponseStatusTests) -> () throws -> Void)] {
       return [
                 ("testHTTPResponseStatusFromStatusCode", testHTTPResponseStatusFromStatusCode),
diff --git a/Tests/NIOHTTP1Tests/HTTPServerClientTest+XCTest.swift b/Tests/NIOHTTP1Tests/HTTPServerClientTest+XCTest.swift
index f7dd54bc..d85372e7 100644
--- a/Tests/NIOHTTP1Tests/HTTPServerClientTest+XCTest.swift
+++ b/Tests/NIOHTTP1Tests/HTTPServerClientTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension HTTPServerClientTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (HTTPServerClientTest) -> () throws -> Void)] {
       return [
                 ("testSimpleGetByteBuffer", testSimpleGetByteBuffer),
diff --git a/Tests/NIOHTTP1Tests/HTTPServerPipelineHandlerTest+XCTest.swift b/Tests/NIOHTTP1Tests/HTTPServerPipelineHandlerTest+XCTest.swift
index f84f27a0..c0228f98 100644
--- a/Tests/NIOHTTP1Tests/HTTPServerPipelineHandlerTest+XCTest.swift
+++ b/Tests/NIOHTTP1Tests/HTTPServerPipelineHandlerTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension HTTPServerPipelineHandlerTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (HTTPServerPipelineHandlerTest) -> () throws -> Void)] {
       return [
                 ("testBasicBufferingBehaviour", testBasicBufferingBehaviour),
diff --git a/Tests/NIOHTTP1Tests/HTTPServerProtocolErrorHandlerTest+XCTest.swift b/Tests/NIOHTTP1Tests/HTTPServerProtocolErrorHandlerTest+XCTest.swift
index 69d4d1eb..c3372343 100644
--- a/Tests/NIOHTTP1Tests/HTTPServerProtocolErrorHandlerTest+XCTest.swift
+++ b/Tests/NIOHTTP1Tests/HTTPServerProtocolErrorHandlerTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension HTTPServerProtocolErrorHandlerTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (HTTPServerProtocolErrorHandlerTest) -> () throws -> Void)] {
       return [
                 ("testHandlesBasicErrors", testHandlesBasicErrors),
diff --git a/Tests/NIOHTTP1Tests/HTTPServerUpgradeTests+XCTest.swift b/Tests/NIOHTTP1Tests/HTTPServerUpgradeTests+XCTest.swift
index 38a7d91f..26aca4f6 100644
--- a/Tests/NIOHTTP1Tests/HTTPServerUpgradeTests+XCTest.swift
+++ b/Tests/NIOHTTP1Tests/HTTPServerUpgradeTests+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension HTTPServerUpgradeTestCase {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (HTTPServerUpgradeTestCase) -> () throws -> Void)] {
       return [
                 ("testUpgradeWithoutUpgrade", testUpgradeWithoutUpgrade),
diff --git a/Tests/NIOHTTP1Tests/HTTPTest+XCTest.swift b/Tests/NIOHTTP1Tests/HTTPTest+XCTest.swift
index 03471251..844b9efe 100644
--- a/Tests/NIOHTTP1Tests/HTTPTest+XCTest.swift
+++ b/Tests/NIOHTTP1Tests/HTTPTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension HTTPTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (HTTPTest) -> () throws -> Void)] {
       return [
                 ("testHTTPSimpleNoHeaders", testHTTPSimpleNoHeaders),
diff --git a/Tests/NIOHTTP1Tests/HTTPTypesTest+XCTest.swift b/Tests/NIOHTTP1Tests/HTTPTypesTest+XCTest.swift
index fc5e3489..e4dffd16 100644
--- a/Tests/NIOHTTP1Tests/HTTPTypesTest+XCTest.swift
+++ b/Tests/NIOHTTP1Tests/HTTPTypesTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension HTTPTypesTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (HTTPTypesTest) -> () throws -> Void)] {
       return [
                 ("testConvertToString", testConvertToString),
diff --git a/Tests/NIOTLSTests/ApplicationProtocolNegotiationHandlerTests+XCTest.swift b/Tests/NIOTLSTests/ApplicationProtocolNegotiationHandlerTests+XCTest.swift
index c7d13819..fd86f046 100644
--- a/Tests/NIOTLSTests/ApplicationProtocolNegotiationHandlerTests+XCTest.swift
+++ b/Tests/NIOTLSTests/ApplicationProtocolNegotiationHandlerTests+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension ApplicationProtocolNegotiationHandlerTests {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (ApplicationProtocolNegotiationHandlerTests) -> () throws -> Void)] {
       return [
                 ("testChannelProvidedToCallback", testChannelProvidedToCallback),
diff --git a/Tests/NIOTLSTests/SNIHandlerTests+XCTest.swift b/Tests/NIOTLSTests/SNIHandlerTests+XCTest.swift
index 1fbfb1ea..ea54ad25 100644
--- a/Tests/NIOTLSTests/SNIHandlerTests+XCTest.swift
+++ b/Tests/NIOTLSTests/SNIHandlerTests+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension SNIHandlerTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (SNIHandlerTest) -> () throws -> Void)] {
       return [
                 ("testLibre227NoSNIDripFeed", testLibre227NoSNIDripFeed),
diff --git a/Tests/NIOTestUtilsTests/ByteToMessageDecoderVerifierTest+XCTest.swift b/Tests/NIOTestUtilsTests/ByteToMessageDecoderVerifierTest+XCTest.swift
index ac3aaaee..01c8a1ea 100644
--- a/Tests/NIOTestUtilsTests/ByteToMessageDecoderVerifierTest+XCTest.swift
+++ b/Tests/NIOTestUtilsTests/ByteToMessageDecoderVerifierTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension ByteToMessageDecoderVerifierTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (ByteToMessageDecoderVerifierTest) -> () throws -> Void)] {
       return [
                 ("testWrongResults", testWrongResults),
diff --git a/Tests/NIOTestUtilsTests/EventCounterHandlerTest+XCTest.swift b/Tests/NIOTestUtilsTests/EventCounterHandlerTest+XCTest.swift
index 7f992859..a9d8eb9c 100644
--- a/Tests/NIOTestUtilsTests/EventCounterHandlerTest+XCTest.swift
+++ b/Tests/NIOTestUtilsTests/EventCounterHandlerTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension EventCounterHandlerTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (EventCounterHandlerTest) -> () throws -> Void)] {
       return [
                 ("testNothingButEmbeddedChannelInit", testNothingButEmbeddedChannelInit),
diff --git a/Tests/NIOTestUtilsTests/NIOHTTP1TestServerTest+XCTest.swift b/Tests/NIOTestUtilsTests/NIOHTTP1TestServerTest+XCTest.swift
index 92c6fb3b..bc7ba646 100644
--- a/Tests/NIOTestUtilsTests/NIOHTTP1TestServerTest+XCTest.swift
+++ b/Tests/NIOTestUtilsTests/NIOHTTP1TestServerTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension NIOHTTP1TestServerTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (NIOHTTP1TestServerTest) -> () throws -> Void)] {
       return [
                 ("testTheExampleInTheDocs", testTheExampleInTheDocs),
diff --git a/Tests/NIOTests/AcceptBackoffHandlerTest+XCTest.swift b/Tests/NIOTests/AcceptBackoffHandlerTest+XCTest.swift
index 7993a5db..688cce7e 100644
--- a/Tests/NIOTests/AcceptBackoffHandlerTest+XCTest.swift
+++ b/Tests/NIOTests/AcceptBackoffHandlerTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension AcceptBackoffHandlerTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (AcceptBackoffHandlerTest) -> () throws -> Void)] {
       return [
                 ("testECONNABORTED", testECONNABORTED),
diff --git a/Tests/NIOTests/BaseObjectsTest+XCTest.swift b/Tests/NIOTests/BaseObjectsTest+XCTest.swift
index cea2a3fc..f48f9aaf 100644
--- a/Tests/NIOTests/BaseObjectsTest+XCTest.swift
+++ b/Tests/NIOTests/BaseObjectsTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension BaseObjectTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (BaseObjectTest) -> () throws -> Void)] {
       return [
                 ("testNIOByteBufferConversion", testNIOByteBufferConversion),
diff --git a/Tests/NIOTests/BlockingIOThreadPoolTest+XCTest.swift b/Tests/NIOTests/BlockingIOThreadPoolTest+XCTest.swift
index 4f8f672b..bf42e25f 100644
--- a/Tests/NIOTests/BlockingIOThreadPoolTest+XCTest.swift
+++ b/Tests/NIOTests/BlockingIOThreadPoolTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension BlockingIOThreadPoolTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (BlockingIOThreadPoolTest) -> () throws -> Void)] {
       return [
                 ("testDoubleShutdownWorks", testDoubleShutdownWorks),
diff --git a/Tests/NIOTests/BootstrapTest+XCTest.swift b/Tests/NIOTests/BootstrapTest+XCTest.swift
index f21329ac..361894a8 100644
--- a/Tests/NIOTests/BootstrapTest+XCTest.swift
+++ b/Tests/NIOTests/BootstrapTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension BootstrapTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (BootstrapTest) -> () throws -> Void)] {
       return [
                 ("testBootstrapsCallInitializersOnCorrectEventLoop", testBootstrapsCallInitializersOnCorrectEventLoop),
diff --git a/Tests/NIOTests/ByteBufferTest+XCTest.swift b/Tests/NIOTests/ByteBufferTest+XCTest.swift
index 23be221d..1b993c6b 100644
--- a/Tests/NIOTests/ByteBufferTest+XCTest.swift
+++ b/Tests/NIOTests/ByteBufferTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension ByteBufferTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (ByteBufferTest) -> () throws -> Void)] {
       return [
                 ("testAllocateAndCount", testAllocateAndCount),
@@ -173,6 +174,7 @@ extension ByteBufferTest {
                 ("testByteBufferAllocatorSize1Capacity", testByteBufferAllocatorSize1Capacity),
                 ("testByteBufferModifiedWithoutAllocationLogic", testByteBufferModifiedWithoutAllocationLogic),
                 ("testByteBufferModifyIfUniquelyOwnedMayThrow", testByteBufferModifyIfUniquelyOwnedMayThrow),
+                ("testDeprecatedSetBytes", testDeprecatedSetBytes),
            ]
    }
 }
diff --git a/Tests/NIOTests/ByteBufferTest.swift b/Tests/NIOTests/ByteBufferTest.swift
index 5ac3254b..2fcf4da0 100644
--- a/Tests/NIOTests/ByteBufferTest.swift
+++ b/Tests/NIOTests/ByteBufferTest.swift
@@ -2441,6 +2441,15 @@ class ByteBufferTest: XCTestCase {
             XCTAssertTrue(error is MyError)
         }
     }
+
+    @available(*, deprecated, message: "deprecated because it tests deprecated functionality")
+    func testDeprecatedSetBytes() {
+        self.buf.clear()
+        self.buf.writeString("hello")
+        self.buf.set(buffer: self.buf, at: 5)
+        self.buf.moveWriterIndex(forwardBy: 5)
+        XCTAssertEqual("hellohello", self.buf.readString(length: 10))
+    }
 }
 
 private enum AllocationExpectationState: Int {
diff --git a/Tests/NIOTests/ChannelNotificationTest+XCTest.swift b/Tests/NIOTests/ChannelNotificationTest+XCTest.swift
index b693e55b..59e4780a 100644
--- a/Tests/NIOTests/ChannelNotificationTest+XCTest.swift
+++ b/Tests/NIOTests/ChannelNotificationTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension ChannelNotificationTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (ChannelNotificationTest) -> () throws -> Void)] {
       return [
                 ("testNotificationOrder", testNotificationOrder),
diff --git a/Tests/NIOTests/ChannelOptionStorageTest+XCTest.swift b/Tests/NIOTests/ChannelOptionStorageTest+XCTest.swift
index 00a7ec9a..47765b37 100644
--- a/Tests/NIOTests/ChannelOptionStorageTest+XCTest.swift
+++ b/Tests/NIOTests/ChannelOptionStorageTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension ChannelOptionStorageTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (ChannelOptionStorageTest) -> () throws -> Void)] {
       return [
                 ("testWeStartWithNoOptions", testWeStartWithNoOptions),
diff --git a/Tests/NIOTests/ChannelPipelineTest+XCTest.swift b/Tests/NIOTests/ChannelPipelineTest+XCTest.swift
index bc482314..004324a2 100644
--- a/Tests/NIOTests/ChannelPipelineTest+XCTest.swift
+++ b/Tests/NIOTests/ChannelPipelineTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension ChannelPipelineTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (ChannelPipelineTest) -> () throws -> Void)] {
       return [
                 ("testGetHandler", testGetHandler),
diff --git a/Tests/NIOTests/ChannelTests+XCTest.swift b/Tests/NIOTests/ChannelTests+XCTest.swift
index d96a25ea..991455a5 100644
--- a/Tests/NIOTests/ChannelTests+XCTest.swift
+++ b/Tests/NIOTests/ChannelTests+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension ChannelTests {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (ChannelTests) -> () throws -> Void)] {
       return [
                 ("testBasicLifecycle", testBasicLifecycle),
diff --git a/Tests/NIOTests/CircularBufferTests+XCTest.swift b/Tests/NIOTests/CircularBufferTests+XCTest.swift
index c9cf1ac0..02e6a637 100644
--- a/Tests/NIOTests/CircularBufferTests+XCTest.swift
+++ b/Tests/NIOTests/CircularBufferTests+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension CircularBufferTests {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (CircularBufferTests) -> () throws -> Void)] {
       return [
                 ("testTrivial", testTrivial),
diff --git a/Tests/NIOTests/CodecTest+XCTest.swift b/Tests/NIOTests/CodecTest+XCTest.swift
index 27c885dc..d79f3bf7 100644
--- a/Tests/NIOTests/CodecTest+XCTest.swift
+++ b/Tests/NIOTests/CodecTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension ByteToMessageDecoderTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (ByteToMessageDecoderTest) -> () throws -> Void)] {
       return [
                 ("testDecoder", testDecoder),
@@ -66,6 +67,7 @@ extension ByteToMessageDecoderTest {
 
 extension MessageToByteEncoderTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (MessageToByteEncoderTest) -> () throws -> Void)] {
       return [
                 ("testEncoderOverrideAllocateOutBuffer", testEncoderOverrideAllocateOutBuffer),
@@ -76,6 +78,7 @@ extension MessageToByteEncoderTest {
 
 extension MessageToByteHandlerTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (MessageToByteHandlerTest) -> () throws -> Void)] {
       return [
                 ("testThrowingEncoderFailsPromises", testThrowingEncoderFailsPromises),
diff --git a/Tests/NIOTests/CustomChannelTests+XCTest.swift b/Tests/NIOTests/CustomChannelTests+XCTest.swift
index acf99449..c493ac1c 100644
--- a/Tests/NIOTests/CustomChannelTests+XCTest.swift
+++ b/Tests/NIOTests/CustomChannelTests+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension CustomChannelTests {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (CustomChannelTests) -> () throws -> Void)] {
       return [
                 ("testWritingIntToSpecialChannel", testWritingIntToSpecialChannel),
diff --git a/Tests/NIOTests/DatagramChannelTests+XCTest.swift b/Tests/NIOTests/DatagramChannelTests+XCTest.swift
index 8b6e69d1..a2431da3 100644
--- a/Tests/NIOTests/DatagramChannelTests+XCTest.swift
+++ b/Tests/NIOTests/DatagramChannelTests+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension DatagramChannelTests {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (DatagramChannelTests) -> () throws -> Void)] {
       return [
                 ("testBasicChannelCommunication", testBasicChannelCommunication),
diff --git a/Tests/NIOTests/EchoServerClientTest+XCTest.swift b/Tests/NIOTests/EchoServerClientTest+XCTest.swift
index 6266faa0..54d16e6d 100644
--- a/Tests/NIOTests/EchoServerClientTest+XCTest.swift
+++ b/Tests/NIOTests/EchoServerClientTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension EchoServerClientTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (EchoServerClientTest) -> () throws -> Void)] {
       return [
                 ("testEcho", testEcho),
diff --git a/Tests/NIOTests/EmbeddedChannelTest+XCTest.swift b/Tests/NIOTests/EmbeddedChannelTest+XCTest.swift
index 2b128af6..287cc6f7 100644
--- a/Tests/NIOTests/EmbeddedChannelTest+XCTest.swift
+++ b/Tests/NIOTests/EmbeddedChannelTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension EmbeddedChannelTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (EmbeddedChannelTest) -> () throws -> Void)] {
       return [
                 ("testWriteOutboundByteBuffer", testWriteOutboundByteBuffer),
diff --git a/Tests/NIOTests/EmbeddedEventLoopTest+XCTest.swift b/Tests/NIOTests/EmbeddedEventLoopTest+XCTest.swift
index 34c83860..c8a1259d 100644
--- a/Tests/NIOTests/EmbeddedEventLoopTest+XCTest.swift
+++ b/Tests/NIOTests/EmbeddedEventLoopTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension EmbeddedEventLoopTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (EmbeddedEventLoopTest) -> () throws -> Void)] {
       return [
                 ("testExecuteDoesNotImmediatelyRunTasks", testExecuteDoesNotImmediatelyRunTasks),
diff --git a/Tests/NIOTests/EventLoopFutureTest+XCTest.swift b/Tests/NIOTests/EventLoopFutureTest+XCTest.swift
index c302b6e9..c0964406 100644
--- a/Tests/NIOTests/EventLoopFutureTest+XCTest.swift
+++ b/Tests/NIOTests/EventLoopFutureTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension EventLoopFutureTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (EventLoopFutureTest) -> () throws -> Void)] {
       return [
                 ("testFutureFulfilledIfHasResult", testFutureFulfilledIfHasResult),
diff --git a/Tests/NIOTests/EventLoopTest+XCTest.swift b/Tests/NIOTests/EventLoopTest+XCTest.swift
index 9cedd4d1..a087846e 100644
--- a/Tests/NIOTests/EventLoopTest+XCTest.swift
+++ b/Tests/NIOTests/EventLoopTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension EventLoopTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (EventLoopTest) -> () throws -> Void)] {
       return [
                 ("testSchedule", testSchedule),
diff --git a/Tests/NIOTests/FileRegionTest+XCTest.swift b/Tests/NIOTests/FileRegionTest+XCTest.swift
index fba1c9c6..a79766e0 100644
--- a/Tests/NIOTests/FileRegionTest+XCTest.swift
+++ b/Tests/NIOTests/FileRegionTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension FileRegionTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (FileRegionTest) -> () throws -> Void)] {
       return [
                 ("testWriteFileRegion", testWriteFileRegion),
diff --git a/Tests/NIOTests/GetAddrInfoResolverTest+XCTest.swift b/Tests/NIOTests/GetAddrInfoResolverTest+XCTest.swift
index 7f916653..c023333f 100644
--- a/Tests/NIOTests/GetAddrInfoResolverTest+XCTest.swift
+++ b/Tests/NIOTests/GetAddrInfoResolverTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension GetaddrinfoResolverTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (GetaddrinfoResolverTest) -> () throws -> Void)] {
       return [
                 ("testResolveNoDuplicatesV4", testResolveNoDuplicatesV4),
diff --git a/Tests/NIOTests/HappyEyeballsTest+XCTest.swift b/Tests/NIOTests/HappyEyeballsTest+XCTest.swift
index 6acb2ec4..404200a0 100644
--- a/Tests/NIOTests/HappyEyeballsTest+XCTest.swift
+++ b/Tests/NIOTests/HappyEyeballsTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension HappyEyeballsTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (HappyEyeballsTest) -> () throws -> Void)] {
       return [
                 ("testIPv4OnlyResolution", testIPv4OnlyResolution),
diff --git a/Tests/NIOTests/HeapTests+XCTest.swift b/Tests/NIOTests/HeapTests+XCTest.swift
index f7bf2cab..3d8da963 100644
--- a/Tests/NIOTests/HeapTests+XCTest.swift
+++ b/Tests/NIOTests/HeapTests+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension HeapTests {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (HeapTests) -> () throws -> Void)] {
       return [
                 ("testSimple", testSimple),
diff --git a/Tests/NIOTests/IdleStateHandlerTest+XCTest.swift b/Tests/NIOTests/IdleStateHandlerTest+XCTest.swift
index 7a392ee2..6d9f22ee 100644
--- a/Tests/NIOTests/IdleStateHandlerTest+XCTest.swift
+++ b/Tests/NIOTests/IdleStateHandlerTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension IdleStateHandlerTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (IdleStateHandlerTest) -> () throws -> Void)] {
       return [
                 ("testIdleRead", testIdleRead),
diff --git a/Tests/NIOTests/IntegerTypesTest+XCTest.swift b/Tests/NIOTests/IntegerTypesTest+XCTest.swift
index 041b16f7..8217de64 100644
--- a/Tests/NIOTests/IntegerTypesTest+XCTest.swift
+++ b/Tests/NIOTests/IntegerTypesTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension IntegerTypesTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (IntegerTypesTest) -> () throws -> Void)] {
       return [
                 ("testNextPowerOfOfTwoZero", testNextPowerOfOfTwoZero),
diff --git a/Tests/NIOTests/MarkedCircularBufferTests+XCTest.swift b/Tests/NIOTests/MarkedCircularBufferTests+XCTest.swift
index b089dd7f..6feafb42 100644
--- a/Tests/NIOTests/MarkedCircularBufferTests+XCTest.swift
+++ b/Tests/NIOTests/MarkedCircularBufferTests+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension MarkedCircularBufferTests {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (MarkedCircularBufferTests) -> () throws -> Void)] {
       return [
                 ("testEmptyMark", testEmptyMark),
diff --git a/Tests/NIOTests/MulticastTest+XCTest.swift b/Tests/NIOTests/MulticastTest+XCTest.swift
index 73d07cde..a5bed29a 100644
--- a/Tests/NIOTests/MulticastTest+XCTest.swift
+++ b/Tests/NIOTests/MulticastTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension MulticastTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (MulticastTest) -> () throws -> Void)] {
       return [
                 ("testCanJoinBasicMulticastGroupIPv4", testCanJoinBasicMulticastGroupIPv4),
diff --git a/Tests/NIOTests/NIOAnyDebugTest+XCTest.swift b/Tests/NIOTests/NIOAnyDebugTest+XCTest.swift
index 50b2978b..3ac0f8cb 100644
--- a/Tests/NIOTests/NIOAnyDebugTest+XCTest.swift
+++ b/Tests/NIOTests/NIOAnyDebugTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension NIOAnyDebugTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (NIOAnyDebugTest) -> () throws -> Void)] {
       return [
                 ("testCustomStringConvertible", testCustomStringConvertible),
diff --git a/Tests/NIOTests/NIOCloseOnErrorHandlerTest+XCTest.swift b/Tests/NIOTests/NIOCloseOnErrorHandlerTest+XCTest.swift
index 9089c4ea..c3e1440c 100644
--- a/Tests/NIOTests/NIOCloseOnErrorHandlerTest+XCTest.swift
+++ b/Tests/NIOTests/NIOCloseOnErrorHandlerTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension NIOCloseOnErrorHandlerTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (NIOCloseOnErrorHandlerTest) -> () throws -> Void)] {
       return [
                 ("testChannelCloseOnError", testChannelCloseOnError),
diff --git a/Tests/NIOTests/NonBlockingFileIOTest+XCTest.swift b/Tests/NIOTests/NonBlockingFileIOTest+XCTest.swift
index 088cd7ce..ccd194d6 100644
--- a/Tests/NIOTests/NonBlockingFileIOTest+XCTest.swift
+++ b/Tests/NIOTests/NonBlockingFileIOTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension NonBlockingFileIOTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (NonBlockingFileIOTest) -> () throws -> Void)] {
       return [
                 ("testBasicFileIOWorks", testBasicFileIOWorks),
diff --git a/Tests/NIOTests/PendingDatagramWritesManagerTests+XCTest.swift b/Tests/NIOTests/PendingDatagramWritesManagerTests+XCTest.swift
index b7d0a37c..a3465065 100644
--- a/Tests/NIOTests/PendingDatagramWritesManagerTests+XCTest.swift
+++ b/Tests/NIOTests/PendingDatagramWritesManagerTests+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension PendingDatagramWritesManagerTests {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (PendingDatagramWritesManagerTests) -> () throws -> Void)] {
       return [
                 ("testPendingWritesEmptyWritesWorkAndWeDontWriteUnflushedThings", testPendingWritesEmptyWritesWorkAndWeDontWriteUnflushedThings),
diff --git a/Tests/NIOTests/PipeChannelTest+XCTest.swift b/Tests/NIOTests/PipeChannelTest+XCTest.swift
index 8d7b69e4..1a8a81b9 100644
--- a/Tests/NIOTests/PipeChannelTest+XCTest.swift
+++ b/Tests/NIOTests/PipeChannelTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension PipeChannelTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (PipeChannelTest) -> () throws -> Void)] {
       return [
                 ("testBasicIO", testBasicIO),
diff --git a/Tests/NIOTests/PriorityQueueTests+XCTest.swift b/Tests/NIOTests/PriorityQueueTests+XCTest.swift
index bc22addb..701d0958 100644
--- a/Tests/NIOTests/PriorityQueueTests+XCTest.swift
+++ b/Tests/NIOTests/PriorityQueueTests+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension PriorityQueueTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (PriorityQueueTest) -> () throws -> Void)] {
       return [
                 ("testSomeStringsAsc", testSomeStringsAsc),
diff --git a/Tests/NIOTests/RecvByteBufAllocatorTest+XCTest.swift b/Tests/NIOTests/RecvByteBufAllocatorTest+XCTest.swift
index 84a9c15a..6e5ad212 100644
--- a/Tests/NIOTests/RecvByteBufAllocatorTest+XCTest.swift
+++ b/Tests/NIOTests/RecvByteBufAllocatorTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension AdaptiveRecvByteBufferAllocatorTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (AdaptiveRecvByteBufferAllocatorTest) -> () throws -> Void)] {
       return [
                 ("testAdaptive", testAdaptive),
diff --git a/Tests/NIOTests/SelectorTest+XCTest.swift b/Tests/NIOTests/SelectorTest+XCTest.swift
index 99a7861e..b64b968f 100644
--- a/Tests/NIOTests/SelectorTest+XCTest.swift
+++ b/Tests/NIOTests/SelectorTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension SelectorTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (SelectorTest) -> () throws -> Void)] {
       return [
                 ("testDeregisterWhileProcessingEvents", testDeregisterWhileProcessingEvents),
diff --git a/Tests/NIOTests/SocketAddressTest+XCTest.swift b/Tests/NIOTests/SocketAddressTest+XCTest.swift
index 6ee7f125..dbf92700 100644
--- a/Tests/NIOTests/SocketAddressTest+XCTest.swift
+++ b/Tests/NIOTests/SocketAddressTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension SocketAddressTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (SocketAddressTest) -> () throws -> Void)] {
       return [
                 ("testDescriptionWorks", testDescriptionWorks),
diff --git a/Tests/NIOTests/SocketChannelTest+XCTest.swift b/Tests/NIOTests/SocketChannelTest+XCTest.swift
index 7939adf0..8b7951a2 100644
--- a/Tests/NIOTests/SocketChannelTest+XCTest.swift
+++ b/Tests/NIOTests/SocketChannelTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension SocketChannelTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (SocketChannelTest) -> () throws -> Void)] {
       return [
                 ("testAsyncSetOption", testAsyncSetOption),
diff --git a/Tests/NIOTests/SocketOptionProviderTest+XCTest.swift b/Tests/NIOTests/SocketOptionProviderTest+XCTest.swift
index aeb846d0..e0b8af4c 100644
--- a/Tests/NIOTests/SocketOptionProviderTest+XCTest.swift
+++ b/Tests/NIOTests/SocketOptionProviderTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension SocketOptionProviderTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (SocketOptionProviderTest) -> () throws -> Void)] {
       return [
                 ("testSettingAndGettingComplexSocketOption", testSettingAndGettingComplexSocketOption),
diff --git a/Tests/NIOTests/StreamChannelsTest+XCTest.swift b/Tests/NIOTests/StreamChannelsTest+XCTest.swift
index a4b26449..1de3408b 100644
--- a/Tests/NIOTests/StreamChannelsTest+XCTest.swift
+++ b/Tests/NIOTests/StreamChannelsTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension StreamChannelTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (StreamChannelTest) -> () throws -> Void)] {
       return [
                 ("testEchoBasic", testEchoBasic),
diff --git a/Tests/NIOTests/SystemTest+XCTest.swift b/Tests/NIOTests/SystemTest+XCTest.swift
index 4802ead9..56ae6aad 100644
--- a/Tests/NIOTests/SystemTest+XCTest.swift
+++ b/Tests/NIOTests/SystemTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension SystemTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (SystemTest) -> () throws -> Void)] {
       return [
                 ("testSystemCallWrapperPerformance", testSystemCallWrapperPerformance),
diff --git a/Tests/NIOTests/ThreadTest+XCTest.swift b/Tests/NIOTests/ThreadTest+XCTest.swift
index 695cfc53..5b451bb5 100644
--- a/Tests/NIOTests/ThreadTest+XCTest.swift
+++ b/Tests/NIOTests/ThreadTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension ThreadTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (ThreadTest) -> () throws -> Void)] {
       return [
                 ("testCurrentThreadWorks", testCurrentThreadWorks),
diff --git a/Tests/NIOTests/TypeAssistedChannelHandlerTests+XCTest.swift b/Tests/NIOTests/TypeAssistedChannelHandlerTests+XCTest.swift
index d7381376..97cc242c 100644
--- a/Tests/NIOTests/TypeAssistedChannelHandlerTests+XCTest.swift
+++ b/Tests/NIOTests/TypeAssistedChannelHandlerTests+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension TypeAssistedChannelHandlerTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (TypeAssistedChannelHandlerTest) -> () throws -> Void)] {
       return [
                 ("testCanDefineBothInboundAndOutbound", testCanDefineBothInboundAndOutbound),
diff --git a/Tests/NIOTests/UtilitiesTest+XCTest.swift b/Tests/NIOTests/UtilitiesTest+XCTest.swift
index c18ddd90..9163879b 100644
--- a/Tests/NIOTests/UtilitiesTest+XCTest.swift
+++ b/Tests/NIOTests/UtilitiesTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension UtilitiesTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (UtilitiesTest) -> () throws -> Void)] {
       return [
                 ("testCoreCountWorks", testCoreCountWorks),
diff --git a/Tests/NIOWebSocketTests/Base64Test+XCTest.swift b/Tests/NIOWebSocketTests/Base64Test+XCTest.swift
index 2d81b114..49846f1b 100644
--- a/Tests/NIOWebSocketTests/Base64Test+XCTest.swift
+++ b/Tests/NIOWebSocketTests/Base64Test+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension Base64Test {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (Base64Test) -> () throws -> Void)] {
       return [
                 ("testEncodeEmptyData", testEncodeEmptyData),
diff --git a/Tests/NIOWebSocketTests/WebSocketClientEndToEndTests+XCTest.swift b/Tests/NIOWebSocketTests/WebSocketClientEndToEndTests+XCTest.swift
index 17de16dc..23eb450d 100644
--- a/Tests/NIOWebSocketTests/WebSocketClientEndToEndTests+XCTest.swift
+++ b/Tests/NIOWebSocketTests/WebSocketClientEndToEndTests+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension WebSocketClientEndToEndTests {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (WebSocketClientEndToEndTests) -> () throws -> Void)] {
       return [
                 ("testSimpleUpgradeSucceeds", testSimpleUpgradeSucceeds),
diff --git a/Tests/NIOWebSocketTests/WebSocketFrameDecoderTest+XCTest.swift b/Tests/NIOWebSocketTests/WebSocketFrameDecoderTest+XCTest.swift
index caf767ce..9c6fd45d 100644
--- a/Tests/NIOWebSocketTests/WebSocketFrameDecoderTest+XCTest.swift
+++ b/Tests/NIOWebSocketTests/WebSocketFrameDecoderTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension WebSocketFrameDecoderTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (WebSocketFrameDecoderTest) -> () throws -> Void)] {
       return [
                 ("testFramesWithoutBodies", testFramesWithoutBodies),
diff --git a/Tests/NIOWebSocketTests/WebSocketFrameEncoderTest+XCTest.swift b/Tests/NIOWebSocketTests/WebSocketFrameEncoderTest+XCTest.swift
index 9de418aa..faeb846a 100644
--- a/Tests/NIOWebSocketTests/WebSocketFrameEncoderTest+XCTest.swift
+++ b/Tests/NIOWebSocketTests/WebSocketFrameEncoderTest+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension WebSocketFrameEncoderTest {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (WebSocketFrameEncoderTest) -> () throws -> Void)] {
       return [
                 ("testBasicFrameEncoding", testBasicFrameEncoding),
diff --git a/Tests/NIOWebSocketTests/WebSocketServerEndToEndTests+XCTest.swift b/Tests/NIOWebSocketTests/WebSocketServerEndToEndTests+XCTest.swift
index 216b12f1..d306f8e9 100644
--- a/Tests/NIOWebSocketTests/WebSocketServerEndToEndTests+XCTest.swift
+++ b/Tests/NIOWebSocketTests/WebSocketServerEndToEndTests+XCTest.swift
@@ -24,6 +24,7 @@ import XCTest
 
 extension WebSocketServerEndToEndTests {
 
+   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")
    static var allTests : [(String, (WebSocketServerEndToEndTests) -> () throws -> Void)] {
       return [
                 ("testBasicUpgradeDance", testBasicUpgradeDance),
diff --git a/scripts/generate_linux_tests.rb b/scripts/generate_linux_tests.rb
index f2af9fdb..a6f1a535 100755
--- a/scripts/generate_linux_tests.rb
+++ b/scripts/generate_linux_tests.rb
@@ -72,6 +72,7 @@ def createExtensionFile(fileName, classes)
 
     for classArray in classes
       file.write 'extension ' + classArray[0] + " {\n\n"
+      file.write '   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")' +"\n"
       file.write '   static var allTests : [(String, (' + classArray[0] + ") -> () throws -> Void)] {\n"
       file.write "      return [\n"
 
@@ -99,7 +100,15 @@ def createLinuxMain(testsDirectory, allTestSubDirectories, files)
       file.write '   @testable import ' + testSubDirectory + "\n"
     end
     file.write "\n"
-    file.write "   XCTMain([\n"
+    file.write "// This protocol is necessary to we can call the 'run' method (on an existential of this protocol)\n"
+    file.write "// without the compiler noticing that we're calling a deprecated function.\n"
+    file.write "// This hack exists so we can deprecate individual tests which test deprecated functionality without\n"
+    file.write "// getting a compiler warning...\n"
+    file.write "protocol LinuxMainRunner { func run() }\n"
+    file.write "class LinuxMainRunnerImpl: LinuxMainRunner {\n"
+    file.write '   @available(*, deprecated, message: "not actually deprecated. Just deprecated to allow deprecated tests (which test deprecated functionality) without warnings")' + "\n"
+    file.write "   func run() {\n"
+    file.write "       XCTMain([\n"
 
     testCases = []
     for classes in files
@@ -109,9 +118,12 @@ def createLinuxMain(testsDirectory, allTestSubDirectories, files)
     end
 
     for testCase in testCases.sort { |x, y| x <=> y }
-      file.write '         testCase(' + testCase + ".allTests),\n"
+      file.write '             testCase(' + testCase + ".allTests),\n"
     end
-    file.write "    ])\n"
+    file.write "        ])\n"
+    file.write "    }\n"
+    file.write "}\n"
+    file.write "(LinuxMainRunnerImpl() as LinuxMainRunner).run()\n"
     file.write "#endif\n"
   end
 end