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chai-signals.test.js
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chai-signals.test.js
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describe('chai-signals', function() {
var signal, spy, listenerSpy, result;
var expect = chai.expect;
var fnStub = function(){}; // stub function to create chai spies
beforeEach(function () {
signal = new signals.Signal();
spy = chai.signals.spyOnSignal(signal);
var result = ''; // for message tests
});
it('should fail if not spying on signal', function() {
expect(function() {
chai.signals.spyOnSignal({ });
}).to.throw('spyOnSignal requires a signal as a parameter');
});
it('should fail if signal to spy on not specified', function() {
expect(function() {
chai.signals.spyOnSignal();
}).to.throw('spyOnSignal requires a signal as a parameter');
});
it('should fail if signal to spy on is null', function() {
expect(function() {
chai.signals.spyOnSignal(null);
}).to.throw('spyOnSignal requires a signal as a parameter');
});
it('should subscribe to signal on spy', function() {
expect(signal.getNumListeners()).to.equal(1);
});
it('should accept signal in expectations', function () {
signal.dispatch();
expect(signal).to.have.been.dispatched();
});
it('should halt dispatch before it reaches listeners added before spy invocation', function () {
var signal = new signals.Signal();
listenerSpy = chai.spy(fnStub);
signal.add(listenerSpy);
spy = chai.signals.spyOnSignal(signal);
signal.dispatch();
expect(spy).to.have.been.dispatched();
expect(listenerSpy).not.to.have.been.called();
});
it('should halt dispatch before it reaches listeners added after spy invocation', function () {
listenerSpy = chai.spy(fnStub);
signal.add(listenerSpy);
signal.dispatch();
expect(spy).to.have.been.dispatched();
expect(listenerSpy).not.to.have.been.called();
});
describe('stop', function() {
it('should unsubscribe from the signal', function() {
spy.stop();
expect(signal.getNumListeners()).to.equal(0);
});
it('should resume normal dispatch to listeners', function () {
listenerSpy = chai.spy(fnStub);
signal.add(listenerSpy);
spy.stop();
signal.dispatch();
expect(spy).not.to.have.been.dispatched();
expect(listenerSpy).to.have.been.called();
});
});
describe('andThrow', function() {
it('should throw the correct exception', function() {
var exceptionMsg = 'test exception';
spy.andThrow(exceptionMsg);
expect(spy).not.to.have.been.dispatched();
expect(signal.dispatch).to.throw(exceptionMsg);
});
it('should not throw an exception after the spy has been stopped', function () {
var exceptionMsg = 'test exception';
spy.andThrow(exceptionMsg);
spy.stop();
expect(spy).not.to.have.been.dispatched();
expect(signal.dispatch).not.to.throw(exceptionMsg);
});
});
describe('andCallFake', function() {
it('should call the mock function on signal dispatch', function() {
listenerSpy = chai.spy(fnStub);
spy.andCallFake(listenerSpy);
signal.dispatch();
expect(spy).to.have.been.dispatched();
expect(listenerSpy).to.have.been.called();
});
it('should not call the mock function after the spy has been stopped', function () {
listenerSpy = chai.spy(fnStub);
spy.andCallFake(listenerSpy);
spy.stop();
signal.dispatch();
expect(spy).not.to.have.been.dispatched();
expect(listenerSpy).not.to.have.been.called();
});
});
describe('andCallThrough', function() {
it('should call through to listeners added before spy invocation', function () {
var signal = new signals.Signal();
listenerSpy = chai.spy(fnStub);
signal.add(listenerSpy);
spy = chai.signals.spyOnSignal(signal).andCallThrough();
signal.dispatch();
expect(spy).to.have.been.dispatched();
expect(listenerSpy).to.have.been.called();
});
it('should call through to listeners added after spy invocation', function () {
listenerSpy = chai.spy(fnStub);
signal.add(listenerSpy);
spy.andCallThrough();
signal.dispatch();
expect(spy).to.have.been.dispatched();
expect(listenerSpy).to.have.been.called();
});
});
describe('to.have.been.dispatched', function() {
it('should know if signal dispatched', function() {
signal.dispatch();
expect(spy).to.have.been.dispatched();
});
it('should know if signal not dispatched', function() {
expect(spy).not.to.have.been.dispatched();
});
it('should pass if dispatched specified number of times', function() {
signal.dispatch();
signal.dispatch();
signal.dispatch();
expect(spy).to.have.been.dispatched(3);
});
it('should fail if signal count wrong', function() {
signal.dispatch();
expect(spy).not.to.have.been.dispatched(3);
});
describe('messages', function () {
it('should show message when signal expected', function () {
try {
chai.expect(signal).to.have.been.dispatched();
}
catch(err){
result = err.message;
}
finally {
expect(result).to.equal('Expected [Signal active:true numListeners:1] to have been dispatched');
}
});
it('should show message when signal not expected', function () {
try {
signal.dispatch();
chai.expect(signal).to.not.have.been.dispatched();
}
catch(err){
result = err.message;
}
finally {
expect(result).to.equal('Expected [Signal active:true numListeners:1] not to have been dispatched');
}
});
it('should show message when signal expected with count', function () {
try {
chai.expect(signal).to.have.been.dispatched(2);
}
catch(err){
result = err.message;
}
finally {
expect(result).to.equal('Expected [Signal active:true numListeners:1] to have been dispatched 2 times but was 0');
}
});
it('should show message when signal not expected with count', function () {
try {
signal.dispatch();
signal.dispatch();
chai.expect(signal).to.not.have.been.dispatched(2);
}
catch(err){
result = err.message;
}
finally {
expect(result).to.equal('Expected [Signal active:true numListeners:1] not to have been dispatched 2 times but was 2');
}
});
});
});
describe('to.have.been.dispatchedWith', function() {
it('should know if signal dispatched with parameters', function() {
signal.dispatch(1, 5);
signal.dispatch(2, 6);
expect(spy).to.have.been.dispatchedWith(1, 5);
expect(spy).to.have.been.dispatchedWith(2, 6);
});
it('should know if signal not dispatched', function() {
signal.dispatch(1, 5);
expect(spy).not.to.have.been.dispatchedWith(2, 3);
});
it('should know if signal dispatched with same parameters', function() {
signal.dispatch(1);
expect(spy).not.to.have.been.dispatchedWith(1, 5);
});
it('supports simple object equality', function () {
signal.dispatch({foo: 'bar'});
expect(spy).to.have.been.dispatchedWith({foo: 'bar'});
});
describe('messages', function () {
it('should show message when signal expected with matching values', function () {
try {
signal.dispatch(3, 4);
signal.dispatch(5, 6);
expect(spy).to.have.been.dispatchedWith(1,2);
}
catch(err) {
result = err.message;
}
finally {
expect(result).to.equal('Expected [Signal active:true numListeners:1] to have been dispatched with (1, 2) but was with (3,4)(5,6)');
}
});
it('should show message when signal not expected with matching values', function () {
try {
signal.dispatch(1, 2);
signal.dispatch(3, 4);
expect(spy).to.not.have.been.dispatchedWith(1,2);
}
catch(err) {
result = err.message;
}
finally {
expect(result).to.equal('Expected [Signal active:true numListeners:1] not to have been dispatched with (1, 2) but was with (1,2)(3,4)');
}
});
});
});
describe('matching', function() {
it('should chai.signals.spyOnSignal with function matcher', function() {
spy.matching(function(signalInfo) {
return signalInfo === 1;
});
signal.dispatch(1);
signal.dispatch(5);
signal.dispatch(1);
expect(spy).to.have.been.dispatched();
expect(spy).to.have.been.dispatched(2);
});
});
describe('createSignalSpyObj', function() {
var error_msg = 'createSignalSpyObj requires a non-empty array of method names to create spies for';
it('should throw an error if methodNames is an empty array', function() {
expect(function() {
chai.signals.createSignalSpyObj([]);
}).to.throw(error_msg);
});
it('should throw an error if methodNames is not an array', function() {
expect(function() {
chai.signals.createSignalSpyObj({});
}).to.throw(error_msg);
});
it('should return an object of SignalSpies', function() {
var methodNames = [signal, signal, signal],
spies = chai.signals.createSignalSpyObj(methodNames);
methodNames.forEach(function(spy_name) {
expect(spies[spy_name] instanceof chai.signals.SignalSpy).to.equal(true);
});
});
});
});