Merge pull request #4327 from ndevenish/approx

Let approx() work on more generic sequences

testing/python/approx.py

@@ -496,3 +496,14 @@ class TestApprox(object):
         assert actual != approx(expected, rel=5e-8, abs=0)
         assert approx(expected, rel=5e-7, abs=0) == actual
         assert approx(expected, rel=5e-8, abs=0) != actual
+
+    def test_generic_sized_iterable_object(self):
+        class MySizedIterable(object):
+            def __iter__(self):
+                return iter([1, 2, 3, 4])
+
+            def __len__(self):
+                return 4
+
+        expected = MySizedIterable()
+        assert [1, 2, 3, 4] == approx(expected)