test: add github-issue-157

Author: nodkz

src/__tests__/guthub_issues/157-test.js

@@ -0,0 +1,51 @@
+/* @flow */
+/* eslint-disable no-await-in-loop */
+
+import mongoose from 'mongoose';
+import MongodbMemoryServer from 'mongodb-memory-server';
+import { EnumTypeComposer, graphql } from 'graphql-compose';
+import { composeWithMongoose } from '../../index';
+
+let mongoServer;
+beforeAll(async () => {
+  mongoServer = new MongodbMemoryServer();
+  const mongoUri = await mongoServer.getConnectionString();
+  await mongoose.connect(
+    mongoUri,
+    { useNewUrlParser: true }
+  );
+  // mongoose.set('debug', true);
+});
+
+afterAll(() => {
+  mongoose.disconnect();
+  mongoServer.stop();
+});
+
+// May require additional time for downloading MongoDB binaries
+jasmine.DEFAULT_TIMEOUT_INTERVAL = 60000;
+
+describe('issue #157 - Optional enum error', () => {
+  const Visit = mongoose.model(
+    'visit',
+    new mongoose.Schema({
+      url: { type: String, required: true },
+      referredBy: { type: String, enum: ['WEBSITE', 'NEWSPAPER'] },
+    })
+  );
+
+  it('check ', async () => {
+    const VisitTC = composeWithMongoose(Visit);
+
+    const referredBy: any = VisitTC.getFieldType('referredBy');
+    expect(referredBy).toBeInstanceOf(graphql.GraphQLEnumType);
+    const etc = EnumTypeComposer.create(referredBy);
+    expect(etc.getFieldNames()).toEqual(['WEBSITE', 'NEWSPAPER']);
+
+    etc.addFields({
+      EMPTY_STRING: { value: '' },
+      NULL: { value: null },
+    });
+    expect(etc.getFieldNames()).toEqual(['WEBSITE', 'NEWSPAPER', 'EMPTY_STRING', 'NULL']);
+  });
+});