[iOS] Add unit tests for user sign-in mediator.

Due to the sign-in architecture migration that extracts sign-in logic
into the mediator it is now possible to test this logic of the code.

Bug: 971989
Change-Id: I9a8279007bc219d3a7415a7b404c981073f9024d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2098383
Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752799}

ios/chrome/browser/sync/sync_setup_service.h

@@ -104,7 +104,8 @@ class SyncSetupService : public KeyedService {
   // changes. PrepareForFirstSyncSetup() needs to be called before. This flag is
   // not set if the user didn't turn on sync.
   // This method should only be used with UnifiedConsent flag.
-  void SetFirstSetupComplete(syncer::SyncFirstSetupCompleteSource source);
+  virtual void SetFirstSetupComplete(
+      syncer::SyncFirstSetupCompleteSource source);
 
   // Returns true if the user finished the Sync setup flow.
   bool IsFirstSetupComplete() const;

ios/chrome/browser/sync/sync_setup_service_mock.h

@@ -29,6 +29,9 @@ class SyncSetupServiceMock : public SyncSetupService {
 
   MOCK_METHOD0(PrepareForFirstSyncSetup, void());
 
+  MOCK_METHOD1(SetFirstSetupComplete,
+               void(syncer::SyncFirstSetupCompleteSource));
+
   // Allow the real SyncSetupService::HasFinishedInitialSetup() to be used when
   // mocking HasFinishedInitialSetup().
   bool SyncSetupServiceHasFinishedInitialSetup();

ios/chrome/browser/ui/authentication/signin/user_signin/BUILD.gn

@@ -42,3 +42,36 @@ source_set("user_signin") {
   public_deps =
       [ "//ios/chrome/browser/ui/authentication/signin:signin_headers" ]
 }
+
+source_set("unit_tests") {
+  configs += [ "//build/config/compiler:enable_arc" ]
+  testonly = true
+  sources = [ "user_signin_mediator_unittest.mm" ]
+  deps = [
+    ":user_signin",
+    "//base/test:test_support",
+    "//components/consent_auditor:test_support",
+    "//components/prefs",
+    "//components/prefs:test_support",
+    "//components/sync/driver:test_support",
+    "//components/sync_preferences",
+    "//components/sync_preferences:test_support",
+    "//ios/chrome/app/strings",
+    "//ios/chrome/browser/browser_state:test_support",
+    "//ios/chrome/browser/main:test_support",
+    "//ios/chrome/browser/prefs:browser_prefs",
+    "//ios/chrome/browser/signin",
+    "//ios/chrome/browser/signin:test_support",
+    "//ios/chrome/browser/sync",
+    "//ios/chrome/browser/sync:test_support",
+    "//ios/chrome/browser/ui/authentication",
+    "//ios/chrome/browser/unified_consent",
+    "//ios/public/provider/chrome/browser/signin",
+    "//ios/public/provider/chrome/browser/signin:fake_chrome_identity",
+    "//ios/public/provider/chrome/browser/signin:test_support",
+    "//ios/web/public/test",
+    "//testing/gmock",
+    "//testing/gtest",
+    "//third_party/ocmock",
+  ]
+}

ios/chrome/browser/ui/authentication/signin/user_signin/user_signin_mediator.mm

@@ -76,7 +76,6 @@
 - (void)cancelSignin {
   if (self.isAuthenticationInProgress) {
     [self cancelAndDismissAuthenticationFlow];
-    [self.delegate userSigninMediatorNeedPrimaryButtonUpdate];
   } else {
     [self.delegate userSigninMediatorSigninFinishedWithResult:
                        SigninCoordinatorResultCanceledByUser];

ios/chrome/test/BUILD.gn

@@ -228,6 +228,7 @@ test("ios_chrome_unittests") {
     "//ios/chrome/browser/ui/authentication/cells:unit_tests",
     "//ios/chrome/browser/ui/authentication/signin:unit_tests",
     "//ios/chrome/browser/ui/authentication/signin/add_account_signin:unit_tests",
+    "//ios/chrome/browser/ui/authentication/signin/user_signin:unit_tests",
     "//ios/chrome/browser/ui/autofill/cells:unit_tests",
     "//ios/chrome/browser/ui/autofill/manual_fill:unit_tests",
     "//ios/chrome/browser/ui/badges:unit_tests",