public void Setup() { _configurationMock = new Mock <IConfigurationWrapper>(); _configurationMock.Setup(mock => mock.GetConfigValue("TwilioAccountSid")).Returns("AC051651a7abfd7ec5209ad22273a24390"); _configurationMock.Setup(mock => mock.GetConfigValue("TwilioFromPhoneNumber")).Returns("+15005550006"); _configurationMock.Setup(mock => mock.GetEnvironmentVarAsString("TWILIO_AUTH_TOKEN")).Returns(Environment.GetEnvironmentVariable("TWILIO_TEST_AUTH_TOKEN")); _fixture = new TwilioService(_configurationMock.Object); _mockLogger = new Mock <ILog>(); _fixture.SetLogger(_mockLogger.Object); }