test prints nulls

Author: jaemk

graphql/language/tests/test_printer.py

@@ -68,6 +68,14 @@ def test_correctly_prints_mutation_with_artifacts():
 '''
 
 
+def test_correctly_prints_null():
+    query_ast_shorthanded = parse('{ thingy(null: "wow", name: null) }')
+    assert print_ast(query_ast_shorthanded) == '''{
+  thingy(null: "wow", name: null)
+}
+'''
+
+
 def test_prints_kitchen_sink():
     ast = parse(KITCHEN_SINK)
     printed = print_ast(ast)