defer close(cache.stopChan)

	gotNumRequest := 0
	binary1 := append(wasmHeader, 1)
	binary2 := append(wasmHeader, 2)

	// Create a test server which returns 0 for the first two calls, and returns 1 for the following calls.
	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if gotNumRequest <= 1 {
			w.Write(binary1)
		} else {
			w.Write(binary2)
		}