public void SetCredentialsProvider()
{
DefaultProfile.ClearDefaultProfile();
Credential credential;
DefaultProfile profile = DefaultProfile.GetProfile();
var mock = new Mock <AlibabaCloudCredentialsProvider>();
AlibabaCloudCredentialsProvider provider = mock.Object;
profile.SetCredentialsProvider(provider); // 不为null时，直接回调，即此操作无效
credential = profile.GetCredential(); // 会执行credential初始化
Assert.NotNull(credential);
Assert.IsType <CredentialsBackupCompatibilityAdaptor>(credential);
profile.SetCredentialsProvider(null); // 会执行credential初始化
credential = profile.GetCredential(); // 不会执行credential初始化
Assert.NotNull(credential);
Assert.IsType <CredentialsBackupCompatibilityAdaptor>(credential);
}
