shouldThrow

import unit_threaded.asserts;
void funcThrows(string msg) { throw new Exception(msg); }
try {
    auto exception = funcThrows("foo bar").shouldThrow;
    assertEqual(exception.msg, "foo bar");
} catch(Exception e) {
    assert(false, "should not have thrown anything and threw: " ~ e.msg);
}

import unit_threaded.asserts;
void func() {}
try {
    func.shouldThrow;
    assert(false, "Should never get here");
} catch(Exception e)
    assertEqual(e.msg, "Expression did not throw");

import unit_threaded.asserts;
void funcAsserts() { assert(false); }
try {
    funcAsserts.shouldThrow;
    assert(false, "Should never get here");
} catch(Exception e)
    assertEqual(e.msg, "Expression threw core.exception.AssertError instead of the expected Exception");