Add test for mocking library (#1545)

test/mock/index.js

@@ -0,0 +1,71 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+'use strict'
+
+const { test } = require('tap')
+const { Client, errors } = require('../../')
+const Mock = require('@elastic/elasticsearch-mock')
+
+test('Mock should work', async t => {
+  t.plan(1)
+
+  const mock = new Mock()
+  const client = new Client({
+    node: 'http://localhost:9200',
+    Connection: mock.getConnection()
+  })
+
+  mock.add({
+    method: 'GET',
+    path: '/_cat/indices'
+  }, () => {
+    return { status: 'ok' }
+  })
+
+  const response = await client.cat.indices()
+  t.same(response.body, { status: 'ok' })
+})
+
+test('Return an error', async t => {
+  t.plan(1)
+
+  const mock = new Mock()
+  const client = new Client({
+    node: 'http://localhost:9200',
+    Connection: mock.getConnection()
+  })
+
+  mock.add({
+    method: 'GET',
+    path: '/_cat/indices'
+  }, () => {
+    return new errors.ResponseError({
+      body: { errors: {}, status: 500 },
+      statusCode: 500
+    })
+  })
+
+  try {
+    await client.cat.indices()
+    t.fail('Should throw')
+  } catch (err) {
+    t.ok(err instanceof errors.ResponseError)
+  }
+})