Cypress Lambda Testing

app.js

const cypress = require("cypress");
const exec = require("child_process").exec;
const child_process = require("child_process");

const runCommand = (command) => {
  console.log("Running ", command);
  try {
    child_process.execSync(command, {
      stdio: "inherit",
    });
  } catch (e) {
    console.log("Error");
    console.warn(e);
  }
};

/**
 * Handler
 * @param {*} event
 */
exports.handler = (event) => {
  // process.env.ELECTRON_EXTRA_LAUNCH_ARGS = "disable-dev-shm-usage";
  process.env.DEBUG = "cypress:*";
  process.env.ELECTRON_EXTRA_LAUNCH_ARGS = [
    "--disable-dev-shm-usage", // disable /dev/shm tmpfs usage on Lambda

    // @TODO: review if these are still relevant:
    "--disable-gpu",
    "--single-process", // Currently wont work without this :-(

    // https://groups.google.com/a/chromium.org/d/msg/headless-dev/qqbZVZ2IwEw/Y95wJUh2AAAJ
    "--no-zygote", // helps avoid zombies

    "--no-sandbox",

    "--disable-setuid-sandbox",
    "--user-data-dir=/tmp/chrome-user-data",

    // old stuff
    // "disable-dev-shm-usage",
    // "disable-gpu",
    // // "no-zygote",
    // // "single-process",
    // "no-sandbox",
    // "disable-software-rasterizer",
  ].join(" ");

  process.env.XDG_CONFIG_HOME = "/tmp"; //  https://github.com/electron/electron/blob/master/docs/api/app.md#appgetpathname

  runCommand("mkdir /tmp/chrome-user-data");
  runCommand("nohup Xvfb :99 &>/dev/null &");
  runCommand("mkdir /tmp/shm");

  return cypress
    .run({
      spec: "/app/cypress/tests/actions_spec.js",
      browser: "chrome",
      env: {
        DEBUG: "cypress:*",
        // XDG_CONFIG_HOME: "/tmp",
      },
      // project: "/tmp",
    })
    .then((r) => {
      console.log("r");
      console.log(r);
      // xvfb.stop();
      return {
        status: 200,
        body: r,
      };
    })
    .catch((e) => {
      console.log("error");
      console.log(e);

      // xvfb.stop();
      return {
        status: 500,
        body: e,
      };
    });
});

cypress-for-lambda.sh

# Patching the Cypress binary to remove any references to /dev/shm
echo "Attempting to patch Cypress 1"
position=$(strings -t d /cypress-cache/6.0.0/Cypress/Cypress | grep '/dev\/shm' -m 1 | cut -d' ' -f1)
echo -n '/tmp/shm' | dd bs=1 of=/cypress-cache/6.0.0/Cypress/Cypress seek="$position" conv=notrunc || echo "Nothing to change"


echo "Attempting to patch Cypress 2"
position=$(strings -t d /cypress-cache/6.0.0/Cypress/Cypress | grep '/dev\/shm\/' | cut -d' ' -f1)
echo -n '/tmp/shm/' | dd bs=1 of=/cypress-cache/6.0.0/Cypress/Cypress seek="$position" conv=notrunc || echo "Nothing to change"

Dockerfile

FROM cypress/browsers:node14.7.0-chrome84

# Install aws-lambda-cpp build dependencies
RUN apt update && \
    apt install -y \
    ffmpeg \
    xvfb \
    g++ \
    make \
    cmake \
    unzip \
    xserver-xorg-input-mouse \
    xserver-xorg-input-kbd \
    libcurl4-openssl-dev

# To ensure we are using the same cache from the docker build to running the tests
ENV CYPRESS_CACHE_FOLDER /cypress-cache

# https://github.com/cypress-io/cypress-docker-images/issues/52
COPY asound.conf /etc/asound.conf

# # for Xvfb
ENV DISPLAY=:99

WORKDIR /app

# Copy application dependency manifests to the container image.
# A wildcard is used to ensure both package.json AND package-lock.json are copied.
# Copying this separately prevents re-running npm install on every code change.
COPY package*.json ./

RUN npm install

# Copy local code to the container image.
COPY . ./
COPY cypress.json ./cypress.json

USER root
# RUN chmod 777 /dev/shm

# Patch Cypress to point to /tmp/shm instead
RUN bash cypress-for-lambda.sh

# Run the web service on container startup.
# CMD [ "npm", "run", "aws:start" ]
ENTRYPOINT ["/usr/local/bin/npm", "run"]
CMD ["aws"]

package.json

{
  "name": "cypress-on-gcp",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "jest",
    "init": "jest --init",
    "aws:start": "Xvfb :99 & $(npm bin)/aws-lambda-ric app.handler",
    "aws": "$(npm bin)/aws-lambda-ric app.handler",
    "cypress:open": "$(npm bin)/cypress open",
    "cypress:verify": "$(npm bin)/cypress verify"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "aws-lambda-ric": "^1.0.0",
    "cypress": "6.0.0"
  },
  "devDependencies": {}
}