jasmine_runner.js

const fs = require('fs');
const path = require('path');
const JasmineRunner = require('jasmine/lib/jasmine');
const {createInterface} = require('readline');

const UTF8 = {
  encoding: 'utf-8'
};

// These exit codes are handled specially by Bazel:
// https://github.com/bazelbuild/bazel/blob/486206012a664ecb20bdb196a681efc9a9825049/src/main/java/com/google/devtools/build/lib/util/ExitCode.java#L44
const BAZEL_EXIT_TESTS_FAILED = 3;
const BAZEL_EXIT_NO_TESTS_FOUND = 4;

// ibazel will write this string after a successful build
// We don't want to re-trigger tests if the compilation fails, so
// we should only listen for this event.
const IBAZEL_NOTIFY_BUILD_SUCCESS = 'IBAZEL_BUILD_COMPLETED SUCCESS';

// Set the StackTraceLimit to infinity. This will make stack capturing slower, but more useful.
// Since we are running tests having proper stack traces is very useful and should be always set to
// the maximum (See: https://nodejs.org/api/errors.html#errors_error_stacktracelimit)
Error.stackTraceLimit = Infinity;


function watch(manifest, jrunner) {
  // ibazel communicates with us via stdin
  const rl = createInterface({input: process.stdin, terminal: false});
  rl.on('line', chunk => {
    console.log('new line')
    if (chunk === IBAZEL_NOTIFY_BUILD_SUCCESS) {
      //TODO: clean out old files?
      addFiles(manifest, jrunner);
      jrunner.execute();
    }
  });
  rl.on('close', () => {
    console.log('someone trying to exit me')
    // Give ibazel 5s to kill our process, otherwise do it ourselves
    setTimeout(() => {
      console.error('ibazel failed to stop jasmine after 5s; probably a bug');
      process.exit(1);
    }, 5000);
  });
}

function addFiles(manifest, jrunner){
  console.log(manifest)
  fs.readFileSync(manifest, UTF8)
    .split('\n')
    .filter(l => l.length > 0)
    .forEach(f => jrunner.addSpecFile(f));
}

function main(args) {
  if (!args.length) {
    throw new Error('Spec file manifest expected argument missing');
  }
  const manifest = require.resolve(args[0]);
  // Remove the manifest, some tested code may process the argv.
  process.argv.splice(2, 1)[0];

  const jrunner = new JasmineRunner();

  addFiles(manifest, jrunner);

  var noSpecsFound = true;
  jrunner.addReporter({
    specDone: () => {
      noSpecsFound = false
    },
  });
  // addReporter throws away the default console reporter
  // so we need to add it back
  jrunner.configureDefaultReporter({});

  jrunner.onComplete((passed) => {
    let exitCode = passed ? 0 : BAZEL_EXIT_TESTS_FAILED;
    if (noSpecsFound) exitCode = BAZEL_EXIT_NO_TESTS_FOUND;
    process.exit(exitCode);
  });

  // TODO: find out how to determine if we're running under ibazel
  if(true) {
    // execute the first time then go into watch mode
    jrunner.execute();
    watch(manifest, jrunner);
  } else {
    jrunner.execute();
    return 0;
  }
}

if (require.main === module) {
  process.exitCode = main(process.argv.slice(2));
}