Two objects have been set up as spies with Jasmine. Here is the setup:
spyOn(obj, 'spy1');
spyOn(obj, 'spy2');
The goal is to verify that calls to spy1 happen before calls to spy2. Both of them can be checked if they are called like this:
expect(obj.spy1).toHaveBeenCalled();
expect(obj.spy2).toHaveBeenCalled();
However, the current method will pass even if obj.spy2() was called first. Is there a simple way to confirm the order in which they were called?
It appears that the team behind Jasmine has taken notice of posts like this one and implemented this feature. The functionality has been documented in their API since version 2.6, although it is not mentioned in older style documentation.
The method
toHaveBeenCalledBefore(expected)allows you to expect a spy to have been called before another spy.Parameters:
Name Type Description expected Spy Spy that should have been called after the actual Spy.
If the expectation fails, the error message will resemble
Expected spy1 to have been called before spy2One approach is to maintain a log of calls:
var objCallOrder;
beforeEach(function() {
// Clear the log before each test
objCallOrder = [];
// Add the method name to the log
obj.spy1.and.callFake(function() { objCallOrder.push('spy1'); });
obj.spy2.and.callFake(function() { objCallOrder.push('spy2'); });
});
This allows verification of the order in different ways:
Compare directly to the call log:
it('calls spy1 followed by spy2', function() {
obj.spy1();
obj.spy2();
expect(objCallOrder).toEqual(['spy1', 'spy2']);
});
Check the sequence of specific calls:
it('ensures spy2 is invoked after spy1', function() {
obj.spy1();
obj.spy3();
obj.spy4();
obj.spy2();
expect(obj.spy1).toHaveBeenCalled();
expect(obj.spy2).toHaveBeenCalled();
expect(objCallOrder.indexOf('spy1')).toBeLessThan(objCallOrder.indexOf('spy2'));
});
My current approach to this task is a bit clumsy and not very scalable:
obj.spy1.andCallFake(function() {
expect(obj.spy2.calls.length).toBe(0);
});
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