¶toThrow.js

getJasmineRequireObj().toThrow = function(j$) {

  function toThrow(util) {
    return {
      compare: function(actual, expected) {
        var result = { pass: false },
          threw = false,
          thrown;

        if (typeof actual != 'function') {
          throw new Error('Actual is not a Function');
        }

        try {
          actual();
        } catch (e) {
          threw = true;
          thrown = e;
        }

        if (!threw) {
          result.message = 'Expected function to throw an exception.';
          return result;
        }

        if (arguments.length == 1) {
          result.pass = true;
          result.message = function() { return 'Expected function not to throw, but it threw ' + j$.pp(thrown) + '.'; };

          return result;
        }

        if (util.equals(thrown, expected)) {
          result.pass = true;
          result.message = function() { return 'Expected function not to throw ' + j$.pp(expected) + '.'; };
        } else {
          result.message = function() { return 'Expected function to throw ' + j$.pp(expected) + ', but it threw ' +  j$.pp(thrown) + '.'; };
        }

        return result;
      }
    };
  }

  return toThrow;
};