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rickhanlonii/mock_dep_injection.js

Last active March 4, 2018 19:29
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Mock Dependency Injection
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mock_dep_injection.js
const doAdd = (a, b, callback) => {
callback(a + b);
};
test("calls callback with arguments added", () => {
const mockCallback = jest.fn();
doAdd(1, 2, mockCallback);
expect(mockCallback).toHaveBeenCalledWith(3);
});
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