I need to write a unit test for the next function and I saw I can use [ExpectedException]
this is the function to be tested.
public static T FailIfEnumIsNotDefined<T>(this T enumValue, string message = null)
where T:struct
{
var enumType = typeof (T);
if (!enumType.IsEnum)
{
throw new ArgumentOutOfRangeException(string.Format("Type {0} is not an Enum, therefore it cannot be checked if it is Defined not have defined.", enumType.FullName));
}
else if (!Enum.IsDefined(enumType, enumValue))
{
throw new ArgumentOutOfRangeException(string.Format("{1} Value {0} is not does not have defined value in Enum of type {0}. It should not be...", enumType.FullName, message ?? ""));
}
return enumValue;
}
and here would go the code to test the exceptions that are supposed to be threw
[TestMethod]
[ExpectedException(ArgumentOutOfRangeException(ArgumentException), "message")]
public void FailIfEnumIsNotDefined_Check_That_The_Value_Is_Not_Enum()
{
// PREPARE
// EXECUTE
// ASSERT
}
I don't have idea have to make the assert for the exceptions either.
ExpectedException just asserts that exception of specified type will be thrown by test method:
[TestMethod]
[ExpectedException(typeof(ArgumentOutOfRangeException))]
public void FailIfEnumIsNotDefined_Check_That_The_Value_Is_Not_Enum()
{
// PREPARE
// EXECUTE
// NO ASSERT!!
}
If you want to assert other parameters of exception, then you should use try..catch in your test method:
[TestMethod]
public void FailIfEnumIsNotDefined_Check_That_The_Value_Is_Not_Enum()
{
// PREPARE
try
{
// EXECUTE
Assert.Fail()
}
catch(Exception exception)
{
// ASSERT EXCEPTION DETAILS
}
}
You can write your own method for asserting exception was thrown to avoid repeating same test code over and over again:
public TException AssertCatch<TException>(Action action)
where TException : Exception
{
try
{
action();
}
catch (TException exception)
{
return exception;
}
throw new AssertFailedException("Expected exception of type " +
typeof(TException) + " was not thrown");
}
Usage:
var exception = AssertCatch<ArgumentOutOfRangeException>(() => /* EXECUTE */);
Assert.AreEqual("foo", exception.Message);
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