[signin] Add unit test for Gaia error in DiceResponseHandler

chrome/browser/signin/dice_response_handler_unittest.cc

Index: chrome/browser/signin/dice_response_handler_unittest.cc
diff --git a/chrome/browser/signin/dice_response_handler_unittest.cc b/chrome/browser/signin/dice_response_handler_unittest.cc
index d3f5eeaa93ac42fa8142758afa352fdeb1aa5f2c..396a282e899379a52b00538aeaad478bc4e3d7d7 100644
--- a/chrome/browser/signin/dice_response_handler_unittest.cc
+++ b/chrome/browser/signin/dice_response_handler_unittest.cc
@@ -112,6 +112,24 @@ TEST_F(DiceResponseHandlerTest, Signin) {
   EXPECT_TRUE(token_service_.RefreshTokenIsAvailable(dice_params.gaia_id));
 }
 
+// Checks that a GaiaAuthFetcher failure is handled correctly.
+TEST_F(DiceResponseHandlerTest, SigninFailure) {
+  DiceResponseParams dice_params = MakeDiceParams(DiceAction::SIGNIN);
+  ASSERT_FALSE(token_service_.RefreshTokenIsAvailable(dice_params.gaia_id));
+  dice_response_handler_.ProcessDiceHeader(dice_params);
+  // Check that a GaiaAuthFetcher has been created.
+  ASSERT_THAT(signin_client_.consumer_, testing::NotNull());
+  EXPECT_EQ(
+      1u, dice_response_handler_.GetPendingDiceTokenFetchersCountForTesting());
+  // Simulate GaiaAuthFetcher failure.
+  signin_client_.consumer_->OnClientOAuthFailure(
+      GoogleServiceAuthError(GoogleServiceAuthError::SERVICE_UNAVAILABLE));
+  EXPECT_EQ(
+      0u, dice_response_handler_.GetPendingDiceTokenFetchersCountForTesting());
+  // Check that the token has not been inserted in the token service.
+  EXPECT_FALSE(token_service_.RefreshTokenIsAvailable(dice_params.gaia_id));
+}
+
 // Checks that a second token for the same account is not requested when a
 // request is already in flight.
 TEST_F(DiceResponseHandlerTest, SigninRepeatedWithSameAccount) {
@@ -176,6 +194,8 @@ TEST_F(DiceResponseHandlerTest, Timeout) {
       base::TimeDelta::FromSeconds(kDiceTokenFetchTimeoutSeconds + 1));
   EXPECT_EQ(
       0u, dice_response_handler_.GetPendingDiceTokenFetchersCountForTesting());
+  // Check that the token has not been inserted in the token service.
+  EXPECT_FALSE(token_service_.RefreshTokenIsAvailable(dice_params.gaia_id));
 }
 
 // Tests that the DiceResponseHandler is created for a normal profile but not