public void SalesforceClientGetVersionsAsync()
        {
            // Arrange
            var service = new SalesforceClient(ConsumerKey, ConsumerSecret, RefreshToken);

            // Act
            IList<ApiVersion> versions = service.GetVersionsAsync().Result;

            // Assert
            Assert.IsNotNull(versions);
            Assert.True(versions.Count > 0);

            foreach (var version in versions)
            {
                Console.WriteLine(version.Version);
            }
        }