Method test_missing_sys_getframe

tests/test_make.py:1480–1487

`make_class()` does not fail when `sys._getframe()` is not available.

(self, monkeypatch)

        assert not isinstance(x, _CountingAttr)

    def test_missing_sys_getframe(self, monkeypatch):
        class="st">"""
        `make_class()` does not fail when `sys._getframe()` is not available.
        class="st">"""
        monkeypatch.delattr(sys, class="st">"_getframe")
        C = make_class(class="st">"C", [class="st">"x"])

        assert 1 == len(C.__attrs_attrs__)

    def test_make_class_ordered(self):
        class="st">"""