Proposal: Expected panic in tests

[DutchGhost]

When writing tests, you sometimes want to assert that the entire test itself panics. Currently we have no way of doing so.

Im proposing some way of notating that a test must panic in order to succeed. If the test does not panic when it should, the test does not succeed.

A simple syntax that is inline with calling conventions could be something along the lines of:

test "name" conv(.ShouldPanic) {
    std.testing.expectEqual(true, false);
}

The test above is considered succesfull, the convention says it expects a panic, which happens.

The default convention of tests would become conv(.NoPanic) or something along those lines.

Some other languages also provide similar facilities in their tests, Rust for example has #[should_panic].

[data-man]

@DutchGhost There is accepted #6621.

[LemonBoy]

See #513 and #1356.