Created UtilityTests test suite

Tests/CSVTests/UtilityTests.swift

@@ -0,0 +1,60 @@
+@testable import CSV
+import XCTest
+
+final class UtilityTests: XCTestCase {
+    let intBytes = "123,456,788,103168".unicodeScalars.map(UInt8.init(ascii:))
+    let floatBytes = "123,456788.1415925".unicodeScalars.map(UInt8.init(ascii:))
+    let doubleBytes = "3.1415926535897931".unicodeScalars.map(UInt8.init(ascii:))
+
+    func testBytesToInt() {
+        let int = self.intBytes.int
+
+        XCTAssertNotNil(int)
+        XCTAssertEqual(int, 123_456_788_103_168)
+
+        XCTAssertNil(self.floatBytes.int)
+        XCTAssertNil(self.doubleBytes.int)
+    }
+
+    func testMeasureBytesToInt() {
+
+        // 0.096
+        measure {
+            for _ in 0..<100_000 {
+                _ = self.intBytes.int
+            }
+        }
+    }
+
+    func testBytesToFloat() {
+        XCTAssertEqual(self.intBytes.float, 123_456_788_103_168)
+        XCTAssertEqual(self.floatBytes.float, 123_456_788.1415925)
+        XCTAssertEqual(self.doubleBytes.float, 3.1415925)
+    }
+
+    func testMeasureBytesToFloat() {
+
+        // 0.108
+        measure {
+            for _ in 0..<100_000 {
+                _ = self.floatBytes.float
+            }
+        }
+    }
+
+    func testBytesToDouble() {
+        XCTAssertEqual(self.intBytes.double, 123_456_788_103_168)
+        XCTAssertEqual(self.floatBytes.double, 123_456_788.1415925)
+        XCTAssertEqual(self.doubleBytes.double, 3.1415926535897931)
+    }
+
+    func testMeasureBytesToDouble() {
+
+        // 0.115
+        measure {
+            for _ in 0..<100_000 {
+                _ = self.doubleBytes.double
+            }
+        }
+    }
+}