How do I use Assert.Throws to assert the type of the exception and the actual message wording?
Something like this:
Assert.Throws<Exception>(
()=>user.MakeUserActive()).WithMessage("Actual exception message")
The method I am testing throws multiple messages of the same type, with different messages, and I need a way to test that the correct message is thrown depending on the context.
You can now use the ExpectedException attributes, e.g.
[Test]
[ExpectedException(typeof(InvalidOperationException),
ExpectedMessage="You can't do that!"]
public void MethodA_WithNull_ThrowsInvalidOperationException()
{
MethodA(null);
}
Assert.That(myTestDelegate, Throws.ArgumentException
.With.Property("Message").EqualTo("your argument is invalid."));
A solution that actually works:
public void Test() {
throw new MyCustomException("You can't do that!");
}
[TestMethod]
public void ThisWillPassIfExceptionThrown()
{
var exception = Assert.ThrowsException<MyCustomException>(
() => Test(),
"This should have thrown!");
Assert.AreEqual("You can't do that!", exception.Message);
}
This works with using Microsoft.VisualStudio.TestTools.UnitTesting;.
For those that are using the NUnit 3.0 Constraint Model and ended up here:
Assert.That(() => MethodUnderTest(someValue), Throws.TypeOf<ArgumentException>());
Asserting exception :
In Junit 5 :
@Test
public void whenExceptionThrown_thenAssertionSucceeds() {
Exception exception = assertThrows(NumberFormatException.class, () -> {
Integer.parseInt("1a");
});
String expectedMessage = "For input string";
String actualMessage = exception.getMessage();
assertTrue(actualMessage.contains(expectedMessage));
}
In Junit 4:
@Test(expected = NullPointerException.class)
public void whenExceptionThrown_thenExpectationSatisfied() {
String test = null;
test.length();
}