public void SendMessage_WithInvalidPhoneNumber_ReturnsError(string phoneNumber)
{
// Arrange
var twilioStub = new StubTwilioAdapter();
var sms = new SMS(twilioStub);
// Act
var result = sms.SendMessage(phoneNumber, "test");
// Assert
Assert.Contains("error", result.ToLower());
}
public void SendMessage_WithNullParamters_ReturnsError()
{
// Arrange
var twilioStub = new StubTwilioAdapter();
var sms = new SMS(twilioStub);
// Act
var result = sms.SendMessage(null, null);
// Assert
Assert.Contains("error", result.ToLower());
}