binding.js
5.34 KB
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describe('Rivets.Binding', function() {
var model, el, view, binding;
beforeEach(function() {
rivets.configure({
adapter: {
subscribe: function() {},
unsubscribe: function() {},
read: function() {},
publish: function() {}
}
});
el = document.createElement('div');
el.setAttribute('data-text', 'obj.name');
view = rivets.bind(el, {obj: {}});
binding = view.bindings[0];
model = binding.model;
});
it('gets assigned the routine function matching the identifier', function() {
expect(binding.routine).toBe(rivets.routines.text);
});
describe('bind()', function() {
it('subscribes to the model for changes via the adapter', function() {
spyOn(rivets.config.adapter, 'subscribe');
binding.bind();
expect(rivets.config.adapter.subscribe).toHaveBeenCalledWith(model, 'name', binding.set);
});
describe('with preloadData set to true', function() {
beforeEach(function() {
rivets.config.preloadData = true;
});
it('sets the initial value via the adapter', function() {
spyOn(binding, 'set');
spyOn(rivets.config.adapter, 'read');
binding.bind();
expect(rivets.config.adapter.read).toHaveBeenCalledWith(model, 'name');
expect(binding.set).toHaveBeenCalled();
});
});
describe('with the bypass option set to true', function() {
beforeEach(function() {
binding.options.bypass = true;
});
it('sets the initial value from the model directly', function() {
spyOn(binding, 'set');
binding.model.name = 'espresso';
binding.bind();
expect(binding.set).toHaveBeenCalledWith('espresso');
});
});
describe('with dependencies', function() {
beforeEach(function() {
binding.options.dependencies = ['fname', 'lname'];
});
it('sets up observers on the dependant attributes', function() {
spyOn(rivets.config.adapter, 'subscribe');
binding.bind();
expect(rivets.config.adapter.subscribe).toHaveBeenCalledWith(model, 'fname', binding.dependencyCallbacks['fname']);
expect(rivets.config.adapter.subscribe).toHaveBeenCalledWith(model, 'lname', binding.dependencyCallbacks['lname']);
});
});
});
describe('set()', function() {
it('performs the binding routine with the supplied value', function() {
spyOn(binding, 'routine');
binding.set('sweater');
expect(binding.routine).toHaveBeenCalledWith(el, 'sweater');
});
it('applies any formatters to the value before performing the routine', function() {
rivets.formatters.awesome = function(value) { return 'awesome ' + value };
binding.formatters.push('awesome');
spyOn(binding, 'routine');
binding.set('sweater');
expect(binding.routine).toHaveBeenCalledWith(el, 'awesome sweater');
});
describe('on an event binding', function() {
beforeEach(function() {
binding.options.special = 'event';
});
it('performs the binding routine with the supplied function and current listener', function() {
spyOn(binding, 'routine');
func = function() { return 1 + 2; }
binding.set(func);
expect(binding.routine).toHaveBeenCalledWith(el, func, undefined);
});
it('passes the previously set funcation as the current listener on subsequent calls', function() {
spyOn(binding, 'routine');
funca = function() { return 1 + 2; };
funcb = function() { return 2 + 5; };
binding.set(funca);
expect(binding.routine).toHaveBeenCalledWith(el, funca, undefined);
binding.set(funcb);
expect(binding.routine).toHaveBeenCalledWith(el, funcb, funca);
});
});
});
describe('publish()', function() {
it("should publish the value of a number input", function() {
numberInput = document.createElement('input');
numberInput.setAttribute('type', 'number');
numberInput.setAttribute('data-value', 'obj.num');
view = rivets.bind(numberInput, {obj: {num: 42}});
binding = view.bindings[0];
model = binding.model;
numberInput.value = 42;
spyOn(rivets.config.adapter, 'publish');
binding.publish({target: numberInput});
expect(rivets.config.adapter.publish).toHaveBeenCalledWith(model, 'num', '42');
});
});
describe('formattedValue()', function() {
it('applies the current formatters on the supplied value', function() {
rivets.formatters.awesome = function(value) { return 'awesome ' + value };
binding.formatters.push('awesome');
expect(binding.formattedValue('hat')).toBe('awesome hat');
});
it('uses formatters on the model', function() {
model.modelAwesome = function(value) { return 'model awesome ' + value };
binding.formatters.push('modelAwesome');
expect(binding.formattedValue('hat')).toBe('model awesome hat');
});
describe('with a multi-argument formatter string', function() {
beforeEach(function() {
rivets.formatters.awesome = function(value, prefix) {
return prefix + ' awesome ' + value;
};
binding.formatters.push('awesome super');
});
it('applies the formatter with arguments', function() {
expect(binding.formattedValue('jacket')).toBe('super awesome jacket');
});
});
});
});