def test_possible_distributions(self):
        options = BuildOptions([b"greatos", b"betteros"])
        description = options.docs["distribution"]
        self.assertNotIn(
            -1,
            (description.find(b"greatos"), description.find(b"betteros")),
            "Supplied distribution names, greatos and betteros, not found in "
            "--distribution parameter definition: {}".format(description)
        )
``BuildOptions`` offers as possible distributions all of the names
dataset/ETHPy150Open ClusterHQ/flocker/admin/test/test_packaging.py/BuildOptionsTests.test_possible_distributions