adding test for phone number authentication

Author: srushtisv

FirebaseAuth/Tests/SampleSwift/SwiftApiTests/PhoneAuthTests.swift

@@ -0,0 +1,86 @@
+/*
+ * Copyright 2024 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 FirebaseAuth
+import Foundation
+import XCTest
+
+class PhoneAuthTests: TestsBase {
+  let phoneNumber = "+12345678910"
+  // This test verification code is specified for the given test phone number in the developer
+  // console.
+  let verificationCode = "123456"
+
+  func testSignInWithPhoneNumber() throws {
+    Auth.auth().settings?.isAppVerificationDisabledForTesting = true
+    let auth = Auth.auth()
+    let expectation = self.expectation(description: "Sign in with phone number")
+
+    // PhoneAuthProvider used to initiate the Verification process and obtain a verificationID.
+    PhoneAuthProvider.provider()
+      .verifyPhoneNumber(phoneNumber, uiDelegate: nil) { verificationID, error in
+        if let error {
+          XCTAssertNil(error, "Verification error should be nil")
+          XCTAssertNotNil(verificationID, "Verification ID should not be nil")
+        }
+
+        // Create a credential using the test verification code.
+        let credential = PhoneAuthProvider.provider().credential(
+          withVerificationID: verificationID ?? "",
+          verificationCode: self.verificationCode
+        )
+        // Signs in using the credential and verifies that the user is signed in correctly by
+        // checking auth.currentUser.
+        auth.signIn(with: credential) { authResult, error in
+          if let error {
+            XCTAssertNil(error, "Sign in error should be nil")
+            XCTAssertNotNil(authResult, "AuthResult should not be nil")
+            XCTAssertEqual(
+              auth.currentUser?.phoneNumber,
+              self.phoneNumber,
+              "Phone number does not match"
+            )
+          }
+          expectation.fulfill()
+        }
+      }
+
+    waitForExpectations(timeout: TestsBase.kExpectationsTimeout)
+  }
+
+  func testSignInWithPhoneNumberAsync_Success() async throws {
+    Auth.auth().settings?.isAppVerificationDisabledForTesting = true
+    let auth = Auth.auth()
+
+    // Start phone number verification
+    let verificationID = try await PhoneAuthProvider.provider().verifyPhoneNumber(
+      phoneNumber,
+      uiDelegate: nil
+    )
+    XCTAssertNotNil(verificationID, "Expected a verification ID")
+
+    // Create the phone auth credential
+    let credential = PhoneAuthProvider.provider().credential(
+      withVerificationID: verificationID,
+      verificationCode: verificationCode
+    )
+
+    // Sign in with the credential
+    let authResult = try await auth.signIn(with: credential)
+    XCTAssertNotNil(authResult, "Expected a non-nil AuthResult")
+    XCTAssertEqual(auth.currentUser?.phoneNumber, phoneNumber, "Phone number does not match")
+  }
+}