def test_get_installed_products(self, MockExists):
MockExists.return_value = True
pd = ProductDirectory()
top_product = StubProduct("top")
provided_products = [StubProduct("provided")]
pd.list = lambda: [StubProductCertificate(top_product, provided_products)]
installed_products = pd.get_installed_products()
self.assertTrue("top" in installed_products)
