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util.js
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util.js
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/**
* @requires javelin-util
*/
describe('JX.isArray', function() {
it('should correctly identify an array', function() {
expect(JX.isArray([1, 2, 3])).toBe(true);
expect(JX.isArray([])).toBe(true);
});
it('should return false on anything that is not an array', function() {
expect(JX.isArray(1)).toBe(false);
expect(JX.isArray('a string')).toBe(false);
expect(JX.isArray(true)).toBe(false);
expect(JX.isArray(/regex/)).toBe(false);
expect(JX.isArray(new String('a super string'))).toBe(false);
expect(JX.isArray(new Number(42))).toBe(false);
expect(JX.isArray(new Boolean(false))).toBe(false);
expect(JX.isArray({})).toBe(false);
expect(JX.isArray({'0': 1, '1': 2, length: 2})).toBe(false);
expect(JX.isArray((function(){
return arguments;
})('I', 'want', 'to', 'trick', 'you'))).toBe(false);
});
it('should identify an array from another context as an array', function() {
var iframe = document.createElement('iframe');
var name = iframe.name = 'javelin-iframe-test';
iframe.style.display = 'none';
document.body.insertBefore(iframe, document.body.firstChild);
var doc = iframe.contentWindow.document;
doc.write(
'<script>parent.MaybeArray = Array;</script>'
);
var array = MaybeArray(1, 2, 3);
var array2 = new MaybeArray(1);
array2[0] = 5;
expect(JX.isArray(array)).toBe(true);
expect(JX.isArray(array2)).toBe(true);
});
});
describe('JX.bind', function() {
it('should bind a function to a context', function() {
var object = {a: 5, b: 3};
JX.bind(object, function() {
object.b = 1;
})();
expect(object).toEqual({a: 5, b: 1});
});
it('should bind a function without context', function() {
var called;
JX.bind(null, function() {
called = true;
})();
expect(called).toBe(true);
});
it('should bind with arguments', function() {
var list = [];
JX.bind(null, function() {
list.push.apply(list, JX.$A(arguments));
}, 'a', 2, 'c', 4)();
expect(list).toEqual(['a', 2, 'c', 4]);
});
it('should allow to pass additional arguments', function() {
var list = [];
JX.bind(null, function() {
list.push.apply(list, JX.$A(arguments));
}, 'a', 2)('c', 4);
expect(list).toEqual(['a', 2, 'c', 4]);
});
});

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