Fixing unit test

Author: StanleyGoldman

src/tests/UnitTests/Authentication/KeychainTests.cs

@@ -75,7 +75,7 @@ public void Should_Initialize_When_Cache_Invalid()
             var keychain = new Keychain(environment, credentialManager);
             keychain.Initialize();
 
-            fileSystem.Received(1).FileExists(connectionsCacheFile);
+            fileSystem.Received(2).FileExists(connectionsCacheFile);
             fileSystem.Received(1).FileDelete(connectionsCacheFile);
             fileSystem.Received(1).ReadAllText(connectionsCacheFile);
             fileSystem.DidNotReceive().ReadAllLines(Args.String);