[auth-swift] AuthLifecycleTests.swift (#11341)

Author: paulb777

FirebaseAuth/Tests/Unit/AuthDispatcherTests.swift

@@ -19,7 +19,7 @@ import XCTest
 
 class AuthDispatcherTests: XCTestCase {
   let kTestDelay = 0.1
-  let kMaxDifferenceBetweenTimeIntervals = 0.3
+  let kMaxDifferenceBetweenTimeIntervals = 0.4
 
   /** @fn testSharedInstance
       @brief Tests @c sharedInstance returns the same object.

FirebaseAuth/Tests/Unit/AuthLifecycleTests.swift

@@ -0,0 +1,102 @@
+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import Foundation
+import XCTest
+
+@testable import FirebaseAuth
+import FirebaseCore
+
+class AuthLifecycleTests: XCTestCase {
+  private let kFakeAPIKey = "FAKE_API_KEY"
+  private let options = FirebaseOptions(googleAppID: "0:0000000000000:ios:0000000000000000",
+                                        gcmSenderID: "00000000000000000-00000000000-000000000")
+
+  override func setUp() {
+    options.apiKey = kFakeAPIKey
+    FirebaseApp.resetApps()
+    FirebaseApp.configure(options: options)
+  }
+
+  /** @fn testSingleton
+      @brief Verifies the @c auth method behaves like a singleton.
+   */
+  func testSingleton() {
+    let auth1 = Auth.auth()
+    XCTAssertNotNil(auth1)
+    let auth2 = Auth.auth()
+    XCTAssertTrue(auth1 === auth2)
+  }
+
+  /** @fn testDefaultAuth
+      @brief Verifies the @c auth method associates with the default Firebase app.
+   */
+  func testDefaultAuth() throws {
+    let auth1 = Auth.auth()
+    let defaultApp = try XCTUnwrap(FirebaseApp.app())
+    let auth2 = Auth.auth(app: defaultApp)
+    XCTAssertTrue(auth1 === auth2)
+    XCTAssertTrue(auth1.app === defaultApp)
+  }
+
+  /** @fn testAppAPIkey
+      @brief Verifies the API key is correctly copied from @c FIRApp to @c FIRAuth .
+   */
+  func testAppAPIKey() {
+    let auth = Auth.auth()
+    XCTAssertEqual(auth.requestConfiguration.apiKey, kFakeAPIKey)
+  }
+
+  /** @fn testAppAssociation
+      @brief Verifies each @c FIRApp instance associates with a @c FIRAuth .
+   */
+  func testAppAssociation() throws {
+    let app1 = FirebaseApp(instanceWithName: "app1", options: options)
+    let auth1 = Auth(app: app1)
+    XCTAssertNotNil(auth1)
+    XCTAssertEqual(auth1.app, app1)
+
+    let app2 = FirebaseApp(instanceWithName: "app2", options: options)
+    let auth2 = Auth(app: app2)
+    XCTAssertNotNil(auth2)
+    XCTAssertEqual(auth2.app, app2)
+
+    XCTAssert(auth1 !== auth2)
+  }
+
+  /** @fn testLifeCycle
+      @brief Verifies the life cycle of @c FIRAuth is the same as its associated @c FIRApp .
+   */
+  func testLifecycle() {
+    let expectation = self.expectation(description: #function)
+    weak var app: FirebaseApp?
+    weak var auth: Auth?
+    autoreleasepool {
+      let app1 = FirebaseApp(instanceWithName: "app1", options: options)
+      app = app1
+      let auth1 = Auth(app: app1)
+      auth = auth1
+      // Verify that neither the app nor the auth is released yet, i.e., the app owns the auth
+      // because nothing else retains the auth.
+      XCTAssertNotNil(app)
+      XCTAssertNotNil(auth)
+    }
+    DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
+      XCTAssertNil(app)
+      XCTAssertNil(auth)
+      expectation.fulfill()
+    }
+    waitForExpectations(timeout: 1)
+  }
+}