test: add test case for issue 181

Author: corydeppen

src/__tests__/github_issues/181-test.js

@@ -0,0 +1,32 @@
+/* @flow */
+
+import { schemaComposer, InputTypeComposer } from 'graphql-compose';
+import {
+  processFilterOperators,
+  OPERATORS_FIELDNAME,
+} from '../../resolvers/helpers/filterOperators';
+
+let itc: InputTypeComposer<any>;
+
+beforeEach(() => {
+  schemaComposer.clear();
+  itc = schemaComposer.createInputTC({
+    name: 'UserFilterInput',
+    fields: {
+      _id: 'String',
+      employment: 'String',
+      name: 'String',
+      age: 'Int',
+      skills: ['String'],
+    },
+  });
+});
+
+describe(`issue #181 - Cannot read property '_operators' of null`, () => {
+  it('should call query.find if operator value is null', () => {
+    const filter = {
+      [OPERATORS_FIELDNAME]: { age: { ne: null } },
+    };
+    expect(processFilterOperators(filter)).toEqual({ age: { $ne: null } });
+  });
+});