1 files changed, 47 insertions, 0 deletions
diff --git a/Gruntfile.coffee b/Gruntfile.coffee
new file mode 100644
index 000000000..958ff81f8
--- /dev/null
+++ b/Gruntfile.coffee
@@ -0,0 +1,47 @@
+module.exports = (grunt) =>
+  javascriptSpecPath = (path) ->
+    grunt.log.debug "IN: " + path
+    path = path.replace 'app/javascript', 'spec/javascript'
+    if path.match /actions/
+      path = path.replace /actions.*/, 'actions_spec.js'
+    if path.match /reducers/
+      path = path.replace '.js', '_spec.js'
+    grunt.log.debug "OUT: " + path
+    path
+
+  grunt.initConfig
+    pkg: grunt.file.readJSON('package.json')
+    watch:
+      javascripts:
+        files: ['app/javascript/**/*', 'spec/javascript/**/*']
+        tasks: []
+        options:
+          spawn: false
+
+    watchchange:
+      javascript:
+        match: ['app/javascript/**/*', 'spec/javascript/**/*']
+        setConfig: ['jest.run.src']
+        preprocess: javascriptSpecPath
+        tasks: ['jest:run']
+
+    jest:
+      run:
+        files: []
+
+  grunt.loadNpmTasks('grunt-contrib-watch')
+  grunt.loadNpmTasks('grunt-watch-change')
+
+  # Default task(s).
+  grunt.registerMultiTask 'jest', 'run javascript specs', () ->
+    files = []
+    this.files.forEach (file) ->
+      files.push file.src
+    grunt.log.debug files
+    grunt.util.spawn
+      cmd: 'node_modules/.bin/jest'
+      args: files
+      opts: {stdio: 'inherit'}
+    , -> {}
+
+  grunt.registerTask 'default', ['watchchange', 'watch']