Update GoogleSignInTest.init_PassesForceAccountName() to use MockedCo…

…nstruction to test the account being constructed in the builder and then passed into GoogleSignInOptions. This is necessary as Account is an android class and cannot be instantiated normally in a unit test (the constructor will return null).

packages/google_sign_in/google_sign_in_android/android/src/test/java/io/flutter/plugins/googlesignin/GoogleSignInTest.java

@@ -32,6 +32,8 @@
 import org.junit.Test;
 import org.mockito.ArgumentCaptor;
 import org.mockito.Mock;
+import org.mockito.MockedConstruction;
+import org.mockito.Mockito;
 import org.mockito.MockitoAnnotations;
 import org.mockito.Spy;
 
@@ -286,10 +288,19 @@ public void init_PassesForceCodeForRefreshTokenTrueWithServerClientIdFromResourc
 
   @Test
   public void init_PassesForceAccountName() {
-    InitParams params =
-        buildInitParams("fakeClientId", "fakeServerClientId", "[email protected]");
+    String fakeAccountName = "[email protected]";
 
-    initAndAssertForceAccountName(params, "[email protected]");
+    try(MockedConstruction<Account> mocked = Mockito.mockConstruction(Account.class, (mock, context) -> {
+      when(mock.toString()).thenReturn(fakeAccountName);
+    })) {
+      InitParams params =
+        buildInitParams("fakeClientId", "fakeServerClientId2", fakeAccountName);
+
+      initAndAssertForceAccountName(params, fakeAccountName);
+
+      List<Account> constructed = mocked.constructed();
+      Assert.assertEquals(1, constructed.size());
+    }
   }
 
   public void initAndAssertServerClientId(InitParams params, String serverClientId) {
@@ -318,7 +329,7 @@ public void initAndAssertForceAccountName(InitParams params, String forceAccount
     when(mockGoogleSignIn.getClient(any(Context.class), optionsCaptor.capture()))
         .thenReturn(mockClient);
     plugin.init(params);
-    Assert.assertEquals(forceAccountName, optionsCaptor.getValue().getAccount().name);
+    Assert.assertEquals(forceAccountName, optionsCaptor.getValue().getAccount().toString());
   }
 
   private static InitParams buildInitParams(String clientId, String serverClientId) {