Question

When running MSTEST unit tests in debug mode, the execution stops in every expected exception that is thrown. My test looks like this

[TestMethod()]
[ExpectedException(typeof(ArgumentNullException))]
public void ShouldThrowExceptionWhenPassingNull()
{
    object data = null;
    target.CheckNull(data);
}

the target method looks like this:

public void CheckNull(object data)
{
    if (ReferenceEquals(null, data))
    {
        throw new ArgumentNullException("data");
    }
} // test run breaks here: ArgumentNullException was unhandled by user code

Answer 1

Did you try running the tests using ctrl-R ctrl-T instead of ctrl-R T?

EDIT
If it’s not a keyboard shortcut issue, then check out this link. You could try the following as noted there:

1. Disable “break on user unhandled exceptions” for the exception types
   you you are encountering here (via
   Debug -> Exceptions)
2. Disable “break on user unhandled exceptions” for all exceptions (via
   Debug -> Exceptions)
3. Disable “Just My Code”