public void CreateWithUser()
{
var serviceAccountCred = new ServiceAccountCredential(new ServiceAccountCredential.Initializer("MyId", "MyTokenServerUrl")
{
Clock = new MockClock(),
AccessMethod = new DummyAccessMethod(),
HttpClientFactory = new DummyHttpClientFactory(),
DefaultExponentialBackOffPolicy = ExponentialBackOffPolicy.Exception, // This is not the default
ProjectId = "a_project_id",
User = "******",
Scopes = new[] { "scope1" },
}.FromPrivateKey(PrivateKey));
var cred1 = GoogleCredential.FromCredential(serviceAccountCred);
var cred2 = cred1.CreateWithUser("user2");
var svc1 = (ServiceAccountCredential)cred1.UnderlyingCredential;
var svc2 = (ServiceAccountCredential)cred2.UnderlyingCredential;
Assert.Same(serviceAccountCred, svc1);
Assert.NotSame(serviceAccountCred, svc2);
Assert.Same(svc1.Id, svc2.Id);
Assert.Same(svc1.TokenServerUrl, svc2.TokenServerUrl);
Assert.Same(svc1.Clock, svc2.Clock);
Assert.Same(svc1.AccessMethod, svc2.AccessMethod);
Assert.Same(svc1.HttpClientFactory, svc2.HttpClientFactory);
Assert.Equal(svc1.DefaultExponentialBackOffPolicy, svc2.DefaultExponentialBackOffPolicy);
Assert.Same(svc1.ProjectId, svc2.ProjectId);
Assert.NotSame(svc1.User, svc2.User);
Assert.Same(svc1.Scopes, svc2.Scopes);
Assert.Equal("user1", svc1.User);
Assert.Equal("user2", svc2.User);
}