swift package init --type library

Package.swift

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+// swift-tools-version:4.2
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "ULID.swift",
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "ULID.swift",
+            targets: ["ULID.swift"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(
+            name: "ULID.swift",
+            dependencies: []),
+        .testTarget(
+            name: "ULID.swiftTests",
+            dependencies: ["ULID.swift"]),
+    ]
+)

Sources/ULID.swift/ULID_swift.swift

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+struct ULID_swift {
+    var text = "Hello, World!"
+}

Tests/LinuxMain.swift

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+import XCTest
+
+import ULID_swiftTests
+
+var tests = [XCTestCaseEntry]()
+tests += ULID_swiftTests.allTests()
+XCTMain(tests)

Tests/ULID.swiftTests/ULID_swiftTests.swift

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+import XCTest
+@testable import ULID_swift
+
+final class ULID_swiftTests: XCTestCase {
+    func testExample() {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct
+        // results.
+        XCTAssertEqual(ULID_swift().text, "Hello, World!")
+    }
+
+    static var allTests = [
+        ("testExample", testExample),
+    ]
+}

Tests/ULID.swiftTests/XCTestManifests.swift

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+import XCTest
+
+#if !os(macOS)
+public func allTests() -> [XCTestCaseEntry] {
+    return [
+        testCase(ULID_swiftTests.allTests),
+    ]
+}
+#endif