public void ShouldThrowIfContextIsNull()
            {
                // When
                var result = Assert.ThrowsException <ArgumentNullException>(() =>
                                                                            AzureStorageAlias.DeleteBlobsByPrefix(null, null));

                // Then
                Assert.AreEqual("context", result.ParamName);
            }
            public void ShouldThrowIfSettingsAreNull()
            {
                // Given
                var context = Substitute.For <ICakeContext>();
                // When
                var result = Assert.ThrowsException <ArgumentNullException>(() =>
                                                                            AzureStorageAlias.DeleteBlobsByPrefix(context, null));

                // Then
                Assert.AreEqual("settings", result.ParamName);
            }