AngularJS Essentials

Unit Testing
Filters
Next, we are going to test filters. In the following code, there is the plate filter,
which we developed in Chapter 3, Data Handling:
plateFilter.js
parking.filter("plate", function() {
return function(input, separator) {
var firstPart = input.substring(0,3);
var secondPart = input.substring(3);
return firstPart + separator + secondPart;
};
});
The filter dependency of any service could be obtained in the same way; however,
we need to concatenate its name with Filter. In this case, it could be injected as
plateFilter or _plateFilter_. Also, the $filter service could be used for the
same purpose. Consider the following code snippet:
plateFilterSpec.js
describe("Plate Filter Specification", function () {
var plateFilter;
beforeEach(module("parking"));
beforeEach(inject(function (_plateFilter_) {
plateFilter = _plateFilter_;
}));
it("Should format the plate", function () {
var plate = "AAA9999"
var expectedPlate = "AAA-9999";
expect(plateFilter(plate, "-")).toBe(expectedPlate);
});
});
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