Function functionThrows

test/unit/static/js/proclaim.js:474–492

(fn, expected)

    // Utility for testing whether a function throws an error
    function functionThrows (fn, expected) {

        // Try/catch
        var thrown = false;
        var thrownError;
        try {
            fn();
        } catch (err) {
            thrown = true;
            thrownError = err;
        }

        // Check error
        if (thrown && expected) {
            thrown = errorMatches(thrownError, expected);
        }

        return thrown;
    }

    // Utility for checking whether an error matches a given constructor, regexp or string
    function errorMatches (actual, expected) {