Capturing and managing gulp-mocha error messages

Question

Capturing and managing gulp-mocha error messages

For some reason, I just can't seem to get gulp-mocha to properly catch errors in my code. This issue is causing my gulp watch task to abruptly end whenever a test fails.

My setup is incredibly basic:

gulp.task("watch", ["build"], function () {
  gulp.watch([paths.scripts, paths.tests], ["test"]);
});

gulp.task("test", function() {
  return gulp.src(paths.tests)
    .pipe(mocha({ reporter: "spec" }).on("error", gutil.log));
});

I also tried applying the error handler to the entire stream, but encountered the same problem:

gulp.task("test", function() {
  return gulp.src(paths.tests)
    .pipe(mocha({ reporter: "spec" }))
    .on("error", gutil.log);
});

Despite experimenting with plumber, combine, and gulp-batch, I am still unable to resolve this issue. It seems like I must be missing something very obvious.

Gist: http://gist.github.com/RoyJacobs/b518ebac117e95ff1457

javascript mocha.js gulp

Answer 1

Answer №1

If you want 'gulp.watch' to function properly, it is important to disregard any 'error' and consistently emit 'end'.

function handleError(err) {
  console.log(err.toString());
  this.emit('end');
}

gulp.task("test", function() {
  return gulp.src(paths.tests)
    .pipe(mocha({ reporter: "spec" })
    .on("error", handleError));
});

Even though this approach causes the 'gulp test' command to always return '0', which can pose challenges for Continuous Integration, we may need to stick with it for now.

Answer 2

If you want 'gulp.watch' to function properly, it is important to disregard any 'error' and consistently emit 'end'.

function handleError(err) {
  console.log(err.toString());
  this.emit('end');
}

gulp.task("test", function() {
  return gulp.src(paths.tests)
    .pipe(mocha({ reporter: "spec" })
    .on("error", handleError));
});

Even though this approach causes the 'gulp test' command to always return '0', which can pose challenges for Continuous Integration, we may need to stick with it for now.

Answer 3

Answer №2

Building upon the insights provided by Shuhei Kagawa...

To prevent gulp from exiting abruptly when an uncaught error occurs, using the `emitting end` function will convert the error into an exception.

You can set a variable to monitor whether tests are being run in watch mode and then decide whether to exit or continue based on whether it's for development purposes or part of a CI pipeline.

var watching = false;

function handleErrors(err) {
  console.log(err.toString());
  if (watching) {
    this.emit('end');
  } else {
    // Alternatively, to provide more specific action:
    process.exit(1);
  }
}

gulp.task("test", function() {
  return gulp.src(paths.tests)
    .pipe(mocha({ reporter: "spec" }).on("error", handleErrors));
});

gulp.task("watch", ["build"], function () {
  watching = true;
  gulp.watch([paths.tests], ["test"]);
});

This approach can be beneficial for both development environments and for continuous integration (CI).

Answer 4

Building upon the insights provided by Shuhei Kagawa...

To prevent gulp from exiting abruptly when an uncaught error occurs, using the `emitting end` function will convert the error into an exception.

You can set a variable to monitor whether tests are being run in watch mode and then decide whether to exit or continue based on whether it's for development purposes or part of a CI pipeline.

var watching = false;

function handleErrors(err) {
  console.log(err.toString());
  if (watching) {
    this.emit('end');
  } else {
    // Alternatively, to provide more specific action:
    process.exit(1);
  }
}

gulp.task("test", function() {
  return gulp.src(paths.tests)
    .pipe(mocha({ reporter: "spec" }).on("error", handleErrors));
});

gulp.task("watch", ["build"], function () {
  watching = true;
  gulp.watch([paths.tests], ["test"]);
});

This approach can be beneficial for both development environments and for continuous integration (CI).

Capturing and managing gulp-mocha error messages

Answer №1

Answer №2

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