First set of real unit tests

Author: scottmatthewman

.swiftpm/xcode/xcshareddata/xcschemes/SwiftCSVEncoder.xcscheme

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+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1520"
+   version = "1.7">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "SwiftCSVEncoder"
+               BuildableName = "SwiftCSVEncoder"
+               BlueprintName = "SwiftCSVEncoder"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </BuildActionEntry>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "NO"
+            buildForArchiving = "NO"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "SwiftCSVEncoderTests"
+               BuildableName = "SwiftCSVEncoderTests"
+               BlueprintName = "SwiftCSVEncoderTests"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      shouldAutocreateTestPlan = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "SwiftCSVEncoderTests"
+               BuildableName = "SwiftCSVEncoderTests"
+               BlueprintName = "SwiftCSVEncoderTests"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "SwiftCSVEncoder"
+            BuildableName = "SwiftCSVEncoder"
+            BlueprintName = "SwiftCSVEncoder"
+            ReferencedContainer = "container:">
+         </BuildableReference>
+      </MacroExpansion>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

Sources/SwiftCSVEncoder/SwiftCSVEncoder.swift

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+//
+//  CSVEncodableTests.swift
+//  
+//
+//  Created by Scott Matthewman on 30/12/2023.
+//
+
+import XCTest
+import SwiftCSVEncoder
+
+final class CSVEncodableTests: XCTestCase {
+    let date = ISO8601DateFormatter().date(from: "2023-11-07T18:34:21+0100")!
+
+    func testStringEncodesToItself() {
+        let sourceString = #"This is a source string, with commas and "double quotes" in it"#
+
+        XCTAssertEqual(sourceString, sourceString.encode(configuration: .default), "String should not change when encoded")
+    }
+
+    func testIntEncodesToStringRepresentation() {
+        let sourceInt = 12_345_678
+
+        XCTAssertEqual(sourceInt.encode(configuration: .default), "12345678", "Int should encode as a plain number without formatting")
+    }
+
+    func testDoubleEncodesToStringRepresentation() {
+        let sourceDouble = 12_345.678_901
+
+        XCTAssertEqual(sourceDouble.encode(configuration: .default), "12345.678901", "Double should encode as a plain number without formatting")
+    }
+
+    func testOptionalEncodesToEmptyStringWhenNil() {
+        let sourceInt: Int? = nil
+
+        XCTAssertEqual(sourceInt.encode(configuration: .default), "", "A nil optional value should encode as an empty string")
+    }
+
+    func testOptionalEncodesToWrappedValueWhenNotNil() {
+        let sourceInt: Int? = 12_345
+
+        XCTAssertEqual(sourceInt.encode(configuration: .default), "12345", "A non-nil optional value should encode its wrapped value")
+    }
+
+    func testUUIDEncodesToStringRepresentation() {
+        let uuid = UUID()
+
+        XCTAssertEqual(uuid.encode(configuration: .default), uuid.uuidString, "A UUID should encode as its uuidString")
+    }
+
+    func testDateEncodesWithISO8601InUTCByDefault() {
+        XCTAssertEqual(date.encode(configuration: .default), "2023-11-07T17:34:21Z")
+    }
+
+    func testDateEncodesWithDeferredFormat() {
+        let configuration = CSVEncoderConfiguration(dateEncodingStrategy: .deferredToDate)
+
+        XCTAssertEqual(date.encode(configuration: configuration), "07/11/2023, 5:34 pm")
+    }
+
+    func testDateEncodesWithFormatter() {
+        let dateFormatter = DateFormatter()
+        dateFormatter.locale = Locale(identifier: "en_US_POSIX")
+        dateFormatter.dateFormat = "HH:mm:ss -- dd-MM-yyyy"
+
+        let configuration = CSVEncoderConfiguration(dateEncodingStrategy: .formatted(dateFormatter))
+
+        XCTAssertEqual(date.encode(configuration: configuration), "17:34:21 -- 07-11-2023")
+    }
+
+    func testDateEncodedWithCustomClosure() {
+        let configuration = CSVEncoderConfiguration(dateEncodingStrategy: .custom({ date in "Custom returned value" }))
+
+        XCTAssertEqual(date.encode(configuration: configuration), "Custom returned value")
+    }
+}