describe(“toThrow”, function() {

it("throws an error when the actual is not a function", function() {
  var matcher = j$.matchers.toThrow();

  expect(function() {
    matcher.compare({});
    matcherComparator({});
  }).toThrowError("Actual is not a Function");
});

it("fails if actual does not throw", function() {
  var matcher = j$.matchers.toThrow(),
    fn = function() {
      return true;
    },
    result;

  result = matcher.compare(fn);

  expect(result.pass).toBe(false);
  expect(result.message).toEqual("Expected function to throw an exception.");
});

it("passes if it throws but there is no expected", function() {
  var util = {
      equals: jasmine.createSpy('delegated-equal').and.returnValue(true)
    },
    matcher = j$.matchers.toThrow(util),
    fn = function() {
      throw 5;
    },
    result;

  result = matcher.compare(fn);

  expect(result.pass).toBe(true);
  expect(result.message()).toEqual("Expected function not to throw, but it threw 5.");
});

it("passes even if what is thrown is falsy", function() {
  var matcher = j$.matchers.toThrow(),
    fn = function() {
      throw undefined;
    },
    result;

  result = matcher.compare(fn);
  expect(result.pass).toBe(true);
  expect(result.message()).toEqual("Expected function not to throw, but it threw undefined.");
});

it("passes if what is thrown is equivalent to what is expected", function() {
  var util = {
      equals: jasmine.createSpy('delegated-equal').and.returnValue(true)
    },
    matcher = j$.matchers.toThrow(util),
    fn = function() {
      throw 5;
    },
    result;

  result = matcher.compare(fn, 5);

  expect(result.pass).toBe(true);
  expect(result.message()).toEqual("Expected function not to throw 5.");
});

it("fails if what is thrown is not equivalent to what is expected", function() {
  var util = {
      equals: jasmine.createSpy('delegated-equal').and.returnValue(false)
    },
    matcher = j$.matchers.toThrow(util),
    fn = function() {
      throw 5;
    },
    result;

  result = matcher.compare(fn, "foo");

  expect(result.pass).toBe(false);
  expect(result.message()).toEqual("Expected function to throw 'foo', but it threw 5.");
});

it("fails if what is thrown is not equivalent to undefined", function() {
  var util = {
      equals: jasmine.createSpy('delegated-equal').and.returnValue(false)
    },
    matcher = j$.matchers.toThrow(util),
    fn = function() {
      throw 5;
    },
    result;

  result = matcher.compare(fn, void 0);

  expect(result.pass).toBe(false);
  expect(result.message()).toEqual("Expected function to throw undefined, but it threw 5.");
});

});