Add tests

Author: ra1028

DifferenceKit.xcodeproj/project.pbxproj

@@ -9,6 +9,7 @@
 /* Begin PBXBuildFile section */
 		6B2DF878210E2C12004D2D40 /* DifferenceKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 6B2DF86E210E2C12004D2D40 /* DifferenceKit.framework */; };
 		6B444B392163312700AEE32B /* ContentEquatable.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6B444B382163312700AEE32B /* ContentEquatable.swift */; };
+		6B444B3F2165E3D700AEE32B /* ContentEquatableTest.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6B444B3E2165E3D700AEE32B /* ContentEquatableTest.swift */; };
 		6B5B409C211066BF00A931DB /* AlgorithmTest.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6B5B4093211066BF00A931DB /* AlgorithmTest.swift */; };
 		6B5B409D211066BF00A931DB /* ArraySectionTest.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6B5B4094211066BF00A931DB /* ArraySectionTest.swift */; };
 		6B5B409E211066BF00A931DB /* StagedChangesetTest.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6B5B4095211066BF00A931DB /* StagedChangesetTest.swift */; };
@@ -44,6 +45,7 @@
 		6B2DF877210E2C12004D2D40 /* Tests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = Tests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
 		6B2DF88A210E39A8004D2D40 /* DifferenceKit.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; path = DifferenceKit.xcconfig; sourceTree = "<group>"; };
 		6B444B382163312700AEE32B /* ContentEquatable.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContentEquatable.swift; sourceTree = "<group>"; };
+		6B444B3E2165E3D700AEE32B /* ContentEquatableTest.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContentEquatableTest.swift; sourceTree = "<group>"; };
 		6B5B4086211066B300A931DB /* Algorithm.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Algorithm.swift; sourceTree = "<group>"; };
 		6B5B4088211066B300A931DB /* UIKitExtension.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UIKitExtension.swift; sourceTree = "<group>"; };
 		6B5B408A211066B300A931DB /* ArraySection.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ArraySection.swift; sourceTree = "<group>"; };
@@ -148,6 +150,7 @@
 				6B5B4096211066BF00A931DB /* AnyDifferentiableTest.swift */,
 				6B5B4097211066BF00A931DB /* ElementPathTest.swift */,
 				6B5B4098211066BF00A931DB /* ChangesetTest.swift */,
+				6B444B3E2165E3D700AEE32B /* ContentEquatableTest.swift */,
 				6B5B4099211066BF00A931DB /* MeasurementTest.swift */,
 				6B5B409B211066BF00A931DB /* TestTools.swift */,
 				6B5B409A211066BF00A931DB /* Info.plist */,
@@ -282,6 +285,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				6B444B3F2165E3D700AEE32B /* ContentEquatableTest.swift in Sources */,
 				6B5B40A1211066BF00A931DB /* ChangesetTest.swift in Sources */,
 				6B5B409C211066BF00A931DB /* AlgorithmTest.swift in Sources */,
 				6B5B40A0211066BF00A931DB /* ElementPathTest.swift in Sources */,

Tests/ContentEquatableTest.swift

@@ -0,0 +1,28 @@
+import XCTest
+import DifferenceKit
+
+final class ContentEquatableTestCase: XCTestCase {
+    func testEquatableValue() {
+        let value1 = D.a
+        let value2 = D.a
+        let value3 = D.b
+
+        XCTAssertEqual(value1, value2)
+        XCTAssertTrue(value1.isContentEqual(to: value2))
+
+        XCTAssertNotEqual(value1, value3)
+        XCTAssertFalse(value1.isContentEqual(to: value3))
+    }
+
+    func testOptionalValue() {
+        let value1: D? = .a
+        let value2: D? = .a
+        let value3: D? = .b
+
+        XCTAssertTrue(value1.isContentEqual(to: value2))
+        XCTAssertFalse(value1.isContentEqual(to: value3))
+        XCTAssertFalse(value1.isContentEqual(to: nil))
+        XCTAssertFalse(D?.none.isContentEqual(to: value1))
+        XCTAssertTrue(D?.none.isContentEqual(to: nil))
+    }
+}

Tests/TestTools.swift

@@ -4,7 +4,7 @@ import DifferenceKit
 extension Int: Differentiable {}
 extension String: Differentiable {}
 
-enum D: Differentiable, CaseIterable {
+enum D: Differentiable, CaseIterable, Equatable {
     case a, b, c, d, e
 }