Added endpoint for postcodes in Iceland

endpoints/postcodes/documentation.md

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+# Icelandic Addresses
+
+Source [Iceland Post](https://postur.is)
+
+-   GET [/postcodes](https://apis.is/postcodes)
+
+Lookup postcodes in Iceland through the Icelandic Post API
+---

endpoints/postcodes/index.js

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+/* eslint-disable import/first */
+const request = require('request')
+const h = require('apis-helpers')
+const app = require('../../server')
+
+app.get('/postcodes', async (req, res) => {
+  request.get({
+    headers: { 'User-Agent': h.browser() },
+    url: `https://posturapi.prod.postur.is/api/postcodes`,
+  }, (error, response, body) => {
+    if (error || response.statusCode !== 200) {
+      return res.status(500).json({ error: 'www.postur.is refuses to respond or give back data' })
+    }
+    try {
+      return res.cache(86400).send({ results: JSON.parse(body) })
+    } catch (error) {
+      return res.status(500).json({ error: 'www.postur.is changed format of data' })
+    }
+  })
+})

endpoints/postcodes/tests/integration_test.js

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+const request = require('request')
+const helpers = require('../../../lib/test_helpers')
+
+describe('postcodes', () => {
+  it('should return an array of objects containing correct fields', (done) => {
+  const fieldsToCheckFor = ['postCode', 'city']
+  const params = helpers.testRequestParams('/postcodes')
+    const resultHandler = helpers.testRequestHandlerForFields(done, fieldsToCheckFor)
+    request.get(params, resultHandler)
+  })
+})
+
+describe('concerts', () => {
+  it('should return an array of objects containing correct fields', (done) => {
+    const fieldsToCheckFor = ['postCode', 'city']
+    const params = helpers.testRequestParams('/postcodes')
+    const resultHandler = helpers.testRequestHandlerForFields(done, fieldsToCheckFor)
+    request.get(params, resultHandler)
+  })
+  })