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[Core] Add test cases

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Add test cases for model cache to ensure it maintains a single
instance of each model. WTD-1033.
This commit is contained in:
Victor Woeltjen 2015-03-25 16:18:24 -07:00
parent 7e5d363daa
commit 79ebe72c6c
1 changed files with 72 additions and 0 deletions
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72
platform/core/test/models/CachingModelDecoratorSpec.js
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@ -19,6 +19,25 @@ define(
};
}
function fakePromise() {
var chains = [],
callbacks = [];
return {
then: function (callback) {
var next = fakePromise();
callbacks.push(callback);
chains.push(next);
return next;
},
resolve: function (value) {
callbacks.forEach(function (cb, i) {
chains[i].resolve(cb(value));
});
}
};
}
beforeEach(function () {
mockCallback = jasmine.createSpy();
mockModelService = jasmine.createSpyObj('modelService', ['getModels']);
@ -54,6 +73,59 @@ define(
expect(mockCallback).toHaveBeenCalledWith(testModels);
});
it("ensures a single object instance, even for multiple concurrent calls", function () {
var promiseA, promiseB, mockCallback = jasmine.createSpy();
promiseA = fakePromise();
promiseB = fakePromise();
// Issue two calls before those promises resolve
mockModelService.getModels.andReturn(promiseA);
decorator.getModels(['a']);
mockModelService.getModels.andReturn(promiseB);
decorator.getModels(['a']).then(mockCallback);
// Then resolve those promises. Note that we're whiteboxing here
// to figure out which promises to resolve (that is, we know that
// two thens are chained after each getModels)
promiseA.resolve(testModels);
promiseB.resolve({
a: { someNewKey: "some other value" }
});
// Ensure that we have a pointer-identical instance
expect(mockCallback.mostRecentCall.args[0].a)
.toEqual({ someNewKey: "some other value" });
expect(mockCallback.mostRecentCall.args[0].a)
.toBe(testModels.a);
});
it("is robust against updating with undefined values", function () {
var promiseA, promiseB, mockCallback = jasmine.createSpy();
promiseA = fakePromise();
promiseB = fakePromise();
// Issue two calls before those promises resolve
mockModelService.getModels.andReturn(promiseA);
decorator.getModels(['a']);
mockModelService.getModels.andReturn(promiseB);
decorator.getModels(['a']).then(mockCallback);
// Some model providers might erroneously add undefined values
// under requested keys, so handle that
promiseA.resolve({
a: undefined
});
promiseB.resolve({
a: { someNewKey: "some other value" }
});
// Should still have gotten the model
expect(mockCallback.mostRecentCall.args[0].a)
.toEqual({ someNewKey: "some other value" });
});
});
}