shouldThrow

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

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

void funcAsserts() { assert(false, "Oh noes"); }
try {
    funcAsserts.shouldThrow;
    assert(false, "Should never get here");
} catch(Exception e)
    assert(e.msg ==
           "Expression threw core.exception.AssertError instead of the expected Exception:\nOh noes");