.expose fails exposed asserts without errors fails in IE8

[GCheung55]

I see the error in IE8:

[assert.equals] Object doesn't support this property or method expected to be equal to expected spy to have been called at least once but was never called

The error is possibly caused by the assertCalled exposed method executing without scope.

// Throws error "Object doesn't support this property or method"
assertCalled(sinon.spy())

// Throws error "Object doesn't support this property or method"
window.assertCalled(sinon.spy())

// Throws error "expected spy to have been called at least once but was never called"
assertCalled.call(window, sinon.spy())

Would changing the test to execute assertCalled.call(window, sinon.spy()) be acceptable?

[stale]

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