public void ThrowAnExceptionWhenTheApiIsNull()
{
Assert.Throws <ArgumentNullException>(() =>
{
_ = new RasGetErrorStringService(null);
});
}
public void ThrowAWin32ExceptionWhenTheBufferSizeIsTooSmall()
{
var api = new Mock <IRasApi32>();
api.Setup(o => o.RasGetErrorString(1, It.IsAny <StringBuilder>(), It.IsAny <int>())).Returns(ERROR_INSUFFICIENT_BUFFER);
var target = new RasGetErrorStringService(api.Object);
Assert.Throws <System.ComponentModel.Win32Exception>(() => target.GetErrorString(1));
}
public void MustNotThrowAnExceptionWhenTheErrorCodeIsLessThanZero()
{
var api = new Mock <IRasApi32>();
var target = new RasGetErrorStringService(api.Object);
Assert.DoesNotThrow(() => target.GetErrorString(-1));
api.Verify(o => o.RasGetErrorString(It.IsAny <int>(), It.IsAny <StringBuilder>(), It.IsAny <int>()), Times.Once);
}
public void ReturnNullWhenTheErrorCodeIsNotValid()
{
var api = new Mock <IRasApi32>();
api.Setup(o => o.RasGetErrorString(87, It.IsAny <StringBuilder>(), It.IsAny <int>())).Returns(ERROR_INVALID_PARAMETER);
var target = new RasGetErrorStringService(api.Object);
var result = target.GetErrorString(87);
Assert.IsNull(result);
}
public void ReturnTheErrorString()
{
var message = "This is a test message!";
var api = new Mock <IRasApi32>();
api.Setup(o => o.RasGetErrorString(1, It.IsAny <StringBuilder>(), It.IsAny <int>()))
.Callback <int, StringBuilder, int>((o1, o2, o3) => { o2.Append(message); })
.Returns(SUCCESS);
var target = new RasGetErrorStringService(api.Object);
var result = target.GetErrorString(1);
Assert.AreEqual(message, result);
}