public async Task When_read_user_async_with_token_Then_the_user_instance_is_returned()
        {
            // Arrange
            using (var client = new HealthGraphClient(fixture.Auth, fixture.Token))
            {
                // Act
                var user = await client.ReadUserAsync();

                // Assert
                Assert.NotNull(user);
            }
        }
 public async Task When_read_user_async_without_token_Then_argument_exception_is_thrown()
 {
     // Arrange
     using (var client = new HealthGraphClient(fixture.Auth))
     {
         // Act & Assert
         await Assert.ThrowsAsync <InvalidOperationException>(async() => await client.ReadUserAsync());
     }
 }