Add helper function to test that a given URL is a valid Gaia sign in URL.

google_apis/gaia/gaia_auth_util_unittest.cc

Index: google_apis/gaia/gaia_auth_util_unittest.cc
diff --git a/google_apis/gaia/gaia_auth_util_unittest.cc b/google_apis/gaia/gaia_auth_util_unittest.cc
index 352c03286d40891d704d6ba8db78f9548e3c4a92..5a60ebc1d3525333bef3b997dc1a228895dcdeff 100644
--- a/google_apis/gaia/gaia_auth_util_unittest.cc
+++ b/google_apis/gaia/gaia_auth_util_unittest.cc
@@ -4,6 +4,7 @@
 
 #include "google_apis/gaia/gaia_auth_util.h"
 
+#include "googleurl/src/gurl.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace gaia {
@@ -84,4 +85,19 @@ TEST(GaiaAuthUtilTest, SanitizeExistingDomain) {
   EXPECT_EQ(existing, SanitizeEmail(existing));
 }
 
+TEST(GaiaAuthUtilTest, IsGaiaSignonRealm) {
+  // Only https versions of Gaia URLs should be considered valid.
+  EXPECT_TRUE(IsGaiaSignonRealm(GURL("https://accounts.google.com/")));
+  EXPECT_TRUE(IsGaiaSignonRealm(GURL("https://www.google.com/")));
+  EXPECT_FALSE(IsGaiaSignonRealm(GURL("http://accounts.google.com/")));
+  EXPECT_FALSE(IsGaiaSignonRealm(GURL("http://www.google.com/")));
+
+  // Other Google URLs are not valid.
+  EXPECT_FALSE(IsGaiaSignonRealm(GURL("https://google.com/")));
+  EXPECT_FALSE(IsGaiaSignonRealm(GURL("https://mail.google.com/")));
+
+  // Other https URLs are not valid.
+  EXPECT_FALSE(IsGaiaSignonRealm(GURL("https://www.example.com/")));
+}
+
 }  // namespace gaia