Sequential Tests with Tape and Bash

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node_modules

README.md

Sequential Tests with Tape and Bash

A demo of using a bash script to run tape tests in sequence.

Scenario

• Each test script can be run in isolation, and passes:

node one-test.js
node two-test.js

• When running all tests via tape globbing, second test fails:

npm run tape '*-test.js'
# or
npm run bad-test

• Using bash, all tests run and pass:

bash run-tests.sh
# or
npm test

The Problem

• Code being tested calls a global function repeatedly, and does not stop.
• tape allows for running multiple tests via globbing, e.g.: tape '*-test.js'. However, to accomplish this tape will require each script into the same environment, meaning they will share global.

The Solution

• A bash script that runs each test independently, in sequence.

one-test.js

const tape = require('tape');

global.callback = () => {};

global.callTheFunc = () => {
  global.callback();
}

tape.onFinish(() => {
  process.exit(0);
})

tape('test one', test => {
  let count = 0;
  global.callback = () => {
    console.log('called in test one');
    count++;
  }
  setInterval(() => {
    global.callTheFunc();
  }, 100);
  setTimeout(() => {
    // test.fail();
    test.equal(count, 10, "Called ten times");
    test.end();
  }, 1050);
});

package.json

{
  "name": "run-tests",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "bad-test": "tape '*-test.js'",
    "test": "bash run-tests.sh",
    "tape": "tape",
    "gistup": "gistup"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "tape": "^4.6.1"
  }
}

run-tests.sh

#! /bin/bash
for file in ./*-test.js
do
  node "$file"
  if [ $? -ne 0 ]
  then
    exit 1
  fi
done

two-test.js

const tape = require('tape');

tape.onFinish(() => {
  process.exit(0);
})

tape('test two', test => {
  let count = 0;
  global.callback = () => {
    console.log('called in test two');
    count++;
  }
  setTimeout(() => {
    test.equal(count, 0, "Called zero times");
    test.end();
  }, 1000);
});