Warning: No specs executed

[Tamas Piros]

I have the following Gruntfile:

module.exports = function(grunt) {
  grunt.initConfig({
    jasmine: {
      src: '*-class.js',
      options: {
        specs_files: ['spec/*spec.js']
      }
    }      
  });

  grunt.loadNpmTasks('grunt-contrib-jasmine');
  grunt.registerTask('default', ['jasmine']);
};

Dependencies:

"dependencies": {
    "grunt": "^1.0.1"
  },
  "devDependencies": {
    "grunt-contrib-jasmine": "^1.1.0"
  }

When running grunt I get the following message:

Running "jasmine:src" (jasmine) task
Testing Jasmine specs via PhantomJS

Warning: No specs executed, is there a configuration error? Use --force to continue.

Aborted due to warnings.

I have my spec under the 'spec folder':

ls spec
product-spec.js

I don't see what the error is unfortunately and why I don't get any specs executed. Also please note that if I run jasmine only I get the specs executed:

jasmine spec/product-spec.js
Started
...
3 specs, 0 failures
Finished in 0.005 seconds

[kmachemehl]

It's simply a typo:
options: { specs_files: ['spec/*spec.js'] }

should be
options: { specs: ['spec/*spec.js'] }