nishchal-v · nishchal-v · Sep 4, 2022
diff --git a/UnitTests.xcodeproj/project.pbxproj b/UnitTests.xcodeproj/project.pbxproj
@@ -13,9 +13,12 @@
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+		B1AA319128C4B653006FB275 /* Player.swift in Sources */ = {isa = PBXBuildFile; fileRef = B1AA319028C4B653006FB275 /* Player.swift */; };
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@@ -260,6 +269,8 @@
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 				B18A152E28C3DD6600D23165 /* AppDelegate.swift in Sources */,
+				B1AA319128C4B653006FB275 /* Player.swift in Sources */,
+				B1AA319728C4D0AF006FB275 /* URlSessionMocks.swift in Sources */,
 				B18A153028C3DD6600D23165 /* SceneDelegate.swift in Sources */,
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diff --git a/UnitTests/Assets.xcassets/AppIcon.appiconset/Contents.json b/UnitTests/Assets.xcassets/AppIcon.appiconset/Contents.json
@@ -70,6 +70,11 @@
       "scale" : "2x",
       "size" : "40x40"
     },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "76x76"
+    },
     {
       "idiom" : "ipad",
       "scale" : "2x",

diff --git a/UnitTests/Player.swift b/UnitTests/Player.swift
@@ -0,0 +1,54 @@
+//
+//  Player.swift
+//  UnitTests
+//
+//  Created by Nishchal Visavadiya on 04/09/22.
+//
+
+import Foundation
+
+/**
+ * A model class to represent a player in the game
+ */
+class Player {
+
+    private(set) var health = 100
+    /**
+     * Represent the hit power of the plyer,
+     * i.e. how muhc damage this player can do in one hit
+     */
+    private(set) var hitPower = 10
+    /**
+     * Whether the player is dead or not
+     */
+    var isDead: Bool {
+        get {
+            return health <= 0
+        }
+    }
+
+    /**
+     * Increments the `hitPower` of self
+     *
+     * - Parameter inc: The increment value
+     *
+     * - Returns: New hit power
+     */
+    func increaseHitPowerBy(inc: Int) -> Int {
+        hitPower += inc
+        return hitPower
+    }
+
+    /**
+     * Hits the playr passed in  parameter with Player.hitPower
+     *
+     * - Parameter player: The player to hit
+     *
+     * - Returns: Whether the hit was successful or not
+     */
+    func hit(player: Player) -> Bool {
+        if player.isDead { return false }
+        player.health -= hitPower
+        return true
+    }
+}
diff --git a/UnitTests/URlSessionMocks.swift b/UnitTests/URlSessionMocks.swift
@@ -0,0 +1,72 @@
+//
+//  URlSessionMocks.swift
+//  UnitTests
+//
+//  Created by Nishchal Visavadiya on 04/09/22.
+//
+
+import Foundation
+
+typealias CompletionHandler = (Data?, URLResponse?, Error?) -> Void
+
+protocol URLSessionProtocol {
+
+    associatedtype DataTaskType
+
+    func dataTask(
+        with url: URL,
+        completionHandler: @escaping CompletionHandler
+    ) -> DataTaskType
+}
+
+extension URLSession: URLSessionProtocol {}
+
+protocol URLSessionDataTaskProtocol {
+    func resume()
+}
+
+extension URLSessionDataTask: URLSessionDataTaskProtocol {}
+
+class URLSessionDataTaskMock: URLSessionDataTaskProtocol {
+
+    private let completion: CompletionHandler
+    private let data: Data?
+    private let error: Error?
+    private let response: URLResponse?
+
+    init(
+        data: Data?,
+        error: Error?,
+        response: URLResponse?,
+        completion: @escaping CompletionHandler
+    ) {
+        self.data = data
+        self.error = error
+        self.response = response
+        self.completion = completion
+    }
+
+    func resume() {
+        completion(data, response, error)
+    }
+}
+
+class URLSessionMock: URLSessionProtocol {
+
+    // data and error can be set to provide data or an error
+    var data: Data?
+    var error: Error?
+    var response: URLResponse?
+
+    func dataTask(
+        with url: URL,
+        completionHandler: @escaping CompletionHandler
+    ) -> URLSessionDataTaskMock {
+        return URLSessionDataTaskMock(
+            data: data,
+            error: error,
+            response: response,
+            completion: completionHandler
+        )
+    }
+}
diff --git a/UnitTestsTests/AsyncTests.swift b/UnitTestsTests/AsyncTests.swift
@@ -0,0 +1,47 @@
+//
+//  AsyncTests.swift
+//  UnitTestsTests
+//
+//  Created by Nishchal Visavadiya on 04/09/22.
+//
+
+import XCTest
+@testable import UnitTests
+
+class AsyncTests: XCTestCase {
+
+    var sut: URLSessionMock!
+
+    override func setUpWithError() throws {
+        try super.setUpWithError()
+        sut = URLSessionMock()
+    }
+
+    func testApiCallCompletes() throws {
+        // given
+        let urlString = "http://www.randomnumberapi.com/test"
+        let url = URL(string: urlString)!
+        let promise = expectation(description: "Completion handler invoked")
+        var statusCode: Int?
+        var responseError: Error?
+
+        // when
+        sut.response = HTTPURLResponse(url: url, statusCode: 200, httpVersion: nil, headerFields: nil)
+        let dataTask = sut.dataTask(with: url) { _, response, error in
+            statusCode = (response as? HTTPURLResponse)?.statusCode
+            responseError = error
+            promise.fulfill()
+        }
+        dataTask.resume()
+        wait(for: [promise], timeout: 5)
+
+        // then
+        XCTAssertNil(responseError)
+        XCTAssertEqual(statusCode, 200)
+    }
+
+    override func tearDownWithError() throws {
+        sut = nil
+        try super.tearDownWithError()
+    }
+}
diff --git a/UnitTestsTests/PlayerUnitTests.swift b/UnitTestsTests/PlayerUnitTests.swift
@@ -0,0 +1,62 @@
+//
+//  PlayerUnitTests.swift
+//  UnitTestsTests
+//
+//  Created by Nishchal Visavadiya on 04/09/22.
+//
+
+import Foundation
+import XCTest
+@testable import UnitTests
+
+class PlayerUnitTests: XCTestCase {
+
+    private var sut: Player!
+
+    override func setUpWithError() throws {
+        try super.setUpWithError()
+        sut = Player()
+    }
+
+    func testHitPowerShouldIncrementBasedOnValueProvided() {
+        // Given
+        let oldHitPower = sut.hitPower
+
+        // When
+        let newHitPower = sut.increaseHitPowerBy(inc: 10)
+
+        // Then
+        XCTAssert(newHitPower == oldHitPower + 10, "Old hit power is incresed by value provided")
+    }
+
+    func testPlayerCanHitAnotherOneIfNotDead() {
+        // Given
+        let anotherPlayer = Player()
+        XCTAssert(!anotherPlayer.isDead)
+
+        // When
+        let hitSuccessfull = sut.hit(player: anotherPlayer)
+
+        // Then
+        XCTAssert(hitSuccessfull == true, "Couuld no dealt damage")
+    }
+
+    func testPlayerShouldBeDeadAfterHealtIsDepleted() {
+        // Given
+        let anotherPlayer = Player()
+        XCTAssert(!anotherPlayer.isDead)
+
+        // When
+        _ = sut.increaseHitPowerBy(inc: 100)
+        let hitSuccessfull = sut.hit(player: anotherPlayer)
+
+        // Then
+        XCTAssert(hitSuccessfull == true, "Could no dealt damage")
+        XCTAssert(anotherPlayer.isDead == true, "Player is not dead even after health less or equal to 0")
+    }
+
+    override func tearDownWithError() throws {
+        sut = nil
+        try super.tearDownWithError()
+    }
+}
diff --git a/UnitTestsTests/UnitTestsTests.swift b/UnitTestsTests/UnitTestsTests.swift