add tests

adcc/test_misc.py

@@ -0,0 +1,45 @@
+import unittest
+
+from adcc.misc import cached_member_function
+
+
+class SomeClass:
+    def uncached(self, x=0, y=1):
+        return (x, y)
+
+    @cached_member_function
+    def cached(self, x=0, y=1):
+        return (x, y)
+
+
+class TestCachedMemberFunction(unittest.TestCase):
+    def test_cache(self):
+        instance = SomeClass()
+        assert instance.uncached() is not instance.uncached()
+        res = instance.cached(0, 1)
+        assert res is instance.cached(0, 1)
+        assert res is instance.cached(0)
+        assert res is instance.cached()
+        assert res is instance.cached(x=0)
+        assert res is instance.cached(y=1)
+        assert res is instance.cached(y=1, x=0)
+
+    def test_wrappable(self):
+        def kwargs_only(self, *, kwarg):
+            pass
+
+        def kwargs(self, **kwargs):
+            pass
+
+        def positional_only(self, /, arg):
+            pass
+
+        def args(self, *args):
+            pass
+
+        with self.assertRaises(ValueError):
+            cached_member_function(kwargs_only)
+        with self.assertRaises(ValueError):
+            cached_member_function(kwargs)
+        cached_member_function(positional_only)
+        cached_member_function(args)