Matchers

Matchers

Matchers can be passed as arguments to spy.calledOn, spy.calledWith, spy.returned and the corresponding sinon.assert functions as well as spy.withArgs`. Matchers allow to be either more fuzzy or more specific about the expected value.

"test should assert fuzzy": function () {
    var book = {
        pages: 42,
        author: "cjno"
    };
    var spy = sinon.spy();

    spy(book);

    sinon.assert.calledWith(spy, sinon.match({ author: "cjno" }));
    sinon.assert.calledWith(spy, sinon.match.has("pages", 42));
}

"test should stub method differently based on argument types": function () {
    var callback = sinon.stub();
    callback.withArgs(sinon.match.string).returns(true);
    callback.withArgs(sinon.match.number).throws("TypeError");

    callback("abc"); // Returns true
    callback(123); // Throws TypeError
}
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