Only run Literal tests if >3.7

Author: necaris

tests/test_converters.py

@@ -1,3 +1,4 @@
+import sys
 import datetime
 import decimal
 import enum
@@ -75,18 +76,22 @@ def test_union():
     assert field.type.__name__.startswith("UnionOf")
 
 
-def test_literal():
-    field = _convert_field_from_spec("attr", (T.Literal["literal1", "literal2", 3], 3))
-    assert issubclass(field.type, graphene.Union)
-    assert field.default_value == 3
-    assert field.type.__name__.startswith("UnionOf")
+if sys.version_info > (3, 7):
+    # Python < 3.8 does not support typing.Literal
 
+    def test_literal():
+        field = _convert_field_from_spec(
+            "attr", (T.Literal["literal1", "literal2", 3], 3)
+        )
+        assert issubclass(field.type, graphene.Union)
+        assert field.default_value == 3
+        assert field.type.__name__.startswith("UnionOf")
 
-def test_literal_singleton():
-    field = _convert_field_from_spec("attr", (T.Literal["literal1"], "literal1"))
-    assert issubclass(field.type, graphene.String)
-    assert field.default_value == "literal1"
-    assert field.type == graphene.String
+    def test_literal_singleton():
+        field = _convert_field_from_spec("attr", (T.Literal["literal1"], "literal1"))
+        assert issubclass(field.type, graphene.String)
+        assert field.default_value == "literal1"
+        assert field.type == graphene.String
 
 
 def test_mapping():