gulp-watch-jasmine.js

// spec はこんな感じで2番目を意図的に失敗させている

describe("A suite is just a function", function() {
  var a;

  it("and so is a spec", function() {
    a = true;

    expect(a).toBe(true);
  });
});

describe("A failure suite is just a function", function() {
  var a;

  it("and so is a failure spec", function() {
    a = false;

    expect(a).toBe(true);
  });
});

describe("A third suite is just a function", function() {
  var a;

  it("and so is a success spec", function() {
    a = false;

    expect(a).toBe(false);
  });
});

// gulpfile.js はこんな感じ
var gulp = require('gulp');
var jasmine = require('gulp-jasmine');

gulp.task('default', ['autotest']);

var specfiles = ['spec/**/*[sS]pec.js'];

gulp.task('test', function() {
	gulp.src(specfiles)
	    .pipe(jasmine({verbose:true, includeStackTrace: true}));
});

gulp.task('autotest', function() {
  gulp.watch(specfiles, function(e) {
	  gulp.src(e.path)
	      .pipe(jasmine());
  });
});

// で、gulp（デフォルトタスク）で起動してfailになると以下のように表示されてしまう
$ gulp
[21:22:26] Using gulpfile ~/codes/atmos/atmosphere-converter/gulpfile.js
[21:22:26] Starting 'autotest'...
[21:22:26] Finished 'autotest' after 6.7 ms
[21:22:26] Starting 'default'...
[21:22:26] Finished 'default' after 9.34 μs

// ここで一度specを更新したけど全部Successなので特に問題なし
...

3 specs, 0 failures
Finished in 0.001 seconds

// その後意図的に失敗させると以下のように表示される
.F.

Failures:
1) A failure suite is just a function and so is a failure spec
1.1) Expected false to be true.

3 specs, 1 failure
Finished in 0.003 seconds


Failures:
1) A failure suite is just a function and so is a failure spec
1.1) Expected false to be true.

3 specs, 1 failure
Finished in 0.004 seconds


Failures:
1) A failure suite is just a function and so is a failure spec
1.1) Expected false to be true.

3 specs, 1 failure
Finished in 0.004 seconds
.

Failures:
1) A failure suite is just a function and so is a failure spec
1.1) Expected false to be true.

4 specs, 1 failure
Finished in 0.005 seconds


Failures:
1) A failure suite is just a function and so is a failure spec
1.1) Expected false to be true.

4 specs, 1 failure
Finished in 0.007 seconds

events.js:72
        throw er; // Unhandled 'error' event
              ^
Error: Tests failed