public void FromConfiguration_HttpClientIsNull_ThrowsArgumentNullException() { var exception = Assert.Throws <ArgumentNullException>(() => HttpClientExtensions.FromConfiguration(null, null, "")); Assert.Equal("client", exception.ParamName); exception = Assert.Throws <ArgumentNullException>(() => HttpClientExtensions.FromConfiguration(null, "", null)); Assert.Equal("client", exception.ParamName); }