Get angular constants in Karma

Question

Given the app startup:

angular.module("starter", [ "ionic" ])
    .constant("DEBUG", true)
    .run(function() {
        /* ... */
    });

how would I test the value of DEBUG?

When trying with:

describe("app", function() {

    beforeEach(function() {
        module("starter");
    });

    describe("constants", function() {
        describe("DEBUG", inject(function(DEBUG) {
            it("should be a boolean", function() {
                expect(typeof DEBUG).toBe("boolean");
            });
        }));
    });
});

I just get

TypeError: 'null' is not an object (evaluating 'currentSpec.$modules')
    at workFn (/%%%/www/lib/angular-mocks/angular-mocks.js:2230)
    at /%%%/www/js/app_test.js:14
    at /%%%/www/js/app_test.js:15
    at /%%%/www/js/app_test.js:16

Answer 1

Make sure it is being instantiated in the right place. In this case, the beforeEach was not being run to load the module, because DEBUG was being inject()ed in the describe block, not the it block. The following works properly:

describe("app", function() {

    var DEBUG;

    beforeEach(function() {
        module("starter");
    });

    describe("constants", function() {
        describe("DEBUG", function() {
            it("should be a boolean", inject(function(DEBUG) {
                expect(typeof DEBUG).toBe("boolean");
            }));
        });
    });
});