public void When_read_user_without_token_Then_argument_exception_is_thrown()
 {
     // Arrange
     using (var client = new HealthGraphClient(fixture.Auth))
     {
         // Act & Assert
         Assert.Throws <InvalidOperationException>(() => client.ReadUser());
     }
 }
 public void When_read_user_with_token_Then_the_user_instance_is_returned()
 {
     // Arrange
     using (var client = new HealthGraphClient(fixture.Auth, fixture.Token))
     {
         // Act
         var user = client.ReadUser();
         // Assert
         Assert.NotNull(user);
     }
 }