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/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)
+  })
+})