diff --git a/frontend_tests/puppeteer_lib/common.js b/frontend_tests/puppeteer_lib/common.js
index 438bb66a00..70f4e63054 100644
--- a/frontend_tests/puppeteer_lib/common.js
+++ b/frontend_tests/puppeteer_lib/common.js
@@ -1,10 +1,12 @@
 const path = require('path');
 const puppeteer = require('puppeteer');
+const assert = require("assert");
 
 class CommonUtils {
     constructor() {
         this.browser = null;
         this.screenshot_id = 0;
+        this.realm_url = "http://zulip.zulipdev.com:9981/";
     }
 
     async ensure_browser() {
@@ -44,6 +46,31 @@ class CommonUtils {
         });
     }
 
+    async log_in(page, credentials) {
+        console.log("Logging in");
+        await page.goto(this.realm_url + 'login/');
+        assert.equal(this.realm_url + 'login/', page.url());
+        await page.type('#id_username', credentials.username);
+        await page.type('#id_password', credentials.password);
+        await page.$eval('#login_form', form => form.submit());
+    }
+
+    async log_out(page) {
+        await page.goto(this.realm_url);
+        const menu_selector = '#settings-dropdown';
+        const logout_selector = 'a[href="#logout"]';
+        console.log("Loggin out");
+        await page.waitForSelector(menu_selector, {visible: true});
+        await page.click(menu_selector);
+        await page.waitForSelector(logout_selector);
+        await page.click(logout_selector);
+
+        // Wait for a email input in login page so we know login
+        // page is loaded. Then check that we are at the login url.
+        await page.waitForSelector('input[name="username"]');
+        assert(page.url().includes('/login/'));
+    }
+
     async run_test(test_function) {
         // Pass a page instance to test so we can take
         // a screenshot of it when the test fails.
diff --git a/frontend_tests/puppeteer_tests/01-login.js b/frontend_tests/puppeteer_tests/01-login.js
index 1a98c90e1d..f68ceb66c7 100644
--- a/frontend_tests/puppeteer_tests/01-login.js
+++ b/frontend_tests/puppeteer_tests/01-login.js
@@ -1,35 +1,9 @@
-const assert = require("assert");
 const common = require('../puppeteer_lib/common');
 const test_credentials = require('../../var/casper/test_credentials.js').test_credentials;
-const realm_url = "http://zulip.zulipdev.com:9981/";
-
-async function log_in(page, credentials) {
-    console.log("Logging in");
-    assert.equal(realm_url + 'login/', page.url());
-    await page.type('#id_username', credentials.username);
-    await page.type('#id_password', credentials.password);
-    await page.$eval('#login_form', form => form.submit());
-}
-
-async function log_out(page) {
-    await page.goto(realm_url);
-    const menu_selector = '#settings-dropdown';
-    const logout_selector = 'a[href="#logout"]';
-    await page.waitForSelector(menu_selector, {visible: true});
-    await page.click(menu_selector);
-    await page.waitForSelector(logout_selector);
-    await page.click(logout_selector);
-
-    // Wait for a email input in login page so we know login
-    // page is loaded. Then check that we are at the login url.
-    await page.waitForSelector('input[name="username"]');
-    assert(page.url().includes('/login/'));
-}
 
 async function login_tests(page) {
-    await page.goto(realm_url + 'login/');
-    await log_in(page, test_credentials.default_user);
-    await log_out(page);
+    await common.log_in(page, test_credentials.default_user);
+    await common.log_out(page);
 }
 
 common.run_test(login_tests);