- function in module ngMock
NOTE: This function is declared ONLY WHEN running tests with jasmine or mocha
This function ensures a single injector will be used for all tests in a given describe context. This contrasts with the default behaviour where a new injector is created per test case.
Use sharedInjector when you want to take advantage of Jasmine's beforeAll()
, or mocha's before()
methods. Call module.sharedInjector()
before you setup any other hooks that will create (i.e call module()
) or use (i.e call inject()
) the injector.
You cannot call sharedInjector()
from within a context already using sharedInjector()
.
Typically beforeAll is used to make many assertions about a single operation. This can cut down test run-time as the test setup doesn't need to be re-run, and enabling focussed tests each with a single assertion.
describe("Deep Thought", function() { module.sharedInjector(); beforeAll(module("UltimateQuestion")); beforeAll(inject(function(DeepThought) { expect(DeepThought.answer).toBeUndefined(); DeepThought.generateAnswer(); })); it("has calculated the answer correctly", inject(function(DeepThought) { // Because of sharedInjector, we have access to the instance of the DeepThought service // that was provided to the beforeAll() hook. Therefore we can test the generated answer expect(DeepThought.answer).toBe(42); })); it("has calculated the answer within the expected time", inject(function(DeepThought) { expect(DeepThought.runTimeMillennia).toBeLessThan(8000); })); it("has double checked the answer", inject(function(DeepThought) { expect(DeepThought.absolutelySureItIsTheRightAnswer).toBe(true); })); });
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