Update CoffeeScript source

17 files changed, 149 insertions, 227 deletions

diff --git a/.jshintrc b/.jshintrc
deleted file mode 100644
index 643c399..0000000
--- a/.jshintrc
+++ /dev/null
@@ -1,63 +0,0 @@
-{
-  // enforcing options
-  "bitwise": true,
-  "camelcase": true,
-  "curly": false,  // we like one liners
-  "eqeqeq": true,
-  "es3": true,
-  "forin": true,
-  "freeze": true,
-  "immed": true,
-  "indent": 1,  // we use tabs
-  "latedef": true,
-  "newcap": true,
-  "noarg": true,
-  "noempty": true,
-  "nonbsp": true,
-  "nonew": true,
-  "plusplus": false,  // we are good at js
-  "quotmark": false,  // we like flexibility
-  "undef": true,
-  "unused": true,
-  "strict": true,
-  "trailing": true,
-  "maxparams": false,  // no
-  "maxdepth": false,   // no
-  "maxstatements": false,  // no
-  "maxcomplexity": false,  // no
-  "maxlen": false,  // no
-  
-  // relaxing options
-  "asi": true,  // we use asi
-  "boss": true,  // we understand assignments
-  "debug": false,
-  "eqnull": true,  // we know how to do null/undefined checks
-  "esnext": false,
-  "evil": false,
-  "expr": false,
-  "funcscope": false,
-  "gcl": true,
-  "globalstrict": false,
-  "iterator": false,
-  "lastsemic": false,
-  "laxbreak": false,
-  "laxcomma": false,
-  "loopfunc": false,
-  "moz": false,
-  "multistr": false,
-  "notypeof": false,
-  "proto": false,
-  "scripturl": false,
-  "smarttabs": false,  // default; spaces should only be mixed with tabs after words
-  "shadow": false,
-  "sub": false,
-  "supernew": false,
-  "noyield": false,
-  
-  // environments
-  "browser": true,
-  "node": true,
-  
-  // legacy
-  "onevar": false
-}
diff --git a/.travis.yml b/.travis.yml
index efd3a59..f136c55 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,6 @@ language: node_js
 # ensure dev dependencies are installed (handled via npm install)
 # ensure test dependencies are installed (handled via cake install)
 install:
-  - npm install grunt-cli -g
   - npm install
 script: "npm test"
 node_js:
diff --git a/Gruntfile.js b/Gruntfile.js
index 5a17749..86df8fb 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -1,7 +1,6 @@
 /*jshint node:true*/
 
 module.exports = function(grunt) {
-  "use strict";
   grunt.initConfig({
     pkg: grunt.file.readJSON('package.json'),
     uglify: {
@@ -15,72 +14,26 @@ module.exports = function(grunt) {
       },
       all: {
         files: {
-          'jquery.once.min.js': ['jquery.once.js']
+          'jquery.once.min.js': [
+            'jquery.once.js'
+          ]
         }
       }
     },
     qunit: {
-      files: ['test/index.html']
-    },
-    jshint: {
-      options: {
-        curly: true,
-        eqeqeq: true,
-        immed: true,
-        latedef: true,
-        newcap: true,
-        noarg: true,
-        sub: true,
-        undef: true,
-        eqnull: true,
-        browser: true,
-        globals: {
-          jQuery: true,
-          $: true,
-          console: true,
-          require: true,
-          define: true
-        }
-      },
       files: [
+        'test/index.html'
+      ]
+    },
+    eslint: {
+      target: [
         'jquery.once.js'
-      ],
-      test: {
-        options: {
-          globals: {
-            jQuery: true,
-            $: true,
-            QUnit: true,
-            module: true,
-            test: true,
-            start: true,
-            stop: true,
-            expect: true,
-            ok: true,
-            equal: true,
-            deepEqual: true,
-            strictEqual: true
-          }
-        },
-        files: {
-          src: [
-            'test/test.js'
-          ]
-        }
-      },
-      grunt: {
-        files: {
-          src: [
-            'Gruntfile.js'
-          ]
-        }
-      }
+      ]
     }
   });
 
   grunt.loadNpmTasks('grunt-contrib-qunit');
   grunt.loadNpmTasks('grunt-contrib-uglify');
-  grunt.loadNpmTasks('grunt-contrib-coffee');
 
   grunt.registerTask('default', ['qunit']);
   grunt.registerTask('release', ['default', 'uglify']);
diff --git a/HISTORY.md b/HISTORY.md
index a6809ed..4ed742d 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,5 +1,20 @@
 # History
 
+## v2.0.0-alpha.10 November 2, 2014
+- Switch to [CoffeeScript](http://coffeescript.org)
+
+## v2.0.0-alpha.9 October 16, 2014
+- `id` parameter of `.once()` now a required parameter
+  - From [@theodoreb](http://github.com/theodoreb)
+
+## v2.0.0-alpha.8 October 9, 2014
+- Update documentation
+- Fix whitespace
+- Switch from JSHint to ESLint
+
+## v2.0.0-alpha.7 October 8, 2014
+- Removed unneeded cache variable
+
 ## v2.0.0-alpha.6 October 5, 2014
 - Removed function callback in order to promote jQuery chaining standards
 
diff --git a/README.md b/README.md
index 28a5abe..6480c7e 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,7 @@ Act on jQuery elements only once.
 ### [Browserify](http://browserify.org/)
 - Use: `require('jquery-once')`
 - Install: `npm install --save jquery-once`
-- CDN URL: `//wzrd.in/bundle/jquery-once@2.0.0-alpha.6`
+- CDN URL: `//wzrd.in/bundle/jquery-once@2.0.0-alpha.9`
 
 ### [Ender](http://ender.jit.su/)
 - Use: `require('jquery-once')`
@@ -54,7 +54,7 @@ Act on jQuery elements only once.
 
 ## Usage
 
-[See the `jquery.once.litcoffee` for documentation.](jquery.once.litcoffee)
+[See `jquery.once.litcoffee` for documentation.](jquery.once.litcoffee)
 
 ## Development
 
@@ -62,21 +62,13 @@ Install dependencies through [npm](http://npmjs.org):
 
     npm install
 
-Use [Grunt](http://gruntjs.com) to run [qunit](http://qunitjs.com) tests:
+Run the following command to run tests:
 
-    grunt jshint qunit
+    npm run-script test
 
-Build the project with [Grunt](http://gruntjs.com):
+Build the project with:
 
-    grunt release
-
-Update project documentation with [Projectz](https://github.com/bevry/projectz):
-
-    npm run-script projectz
-
-Generate code documentation with [JSDoc](http://usejsdoc.org):
-
-    npm run-script jsdoc
+    npm run-script release
 
 
 <!-- HISTORY/ -->
diff --git a/bower.json b/bower.json
index 27c47a4..c311d77 100644
--- a/bower.json
+++ b/bower.json
@@ -1,8 +1,8 @@
 {
   "name": "jquery-once",
   "homepage": "http://github.com/robloach/jquery-once",
-  "description": "jQuery Once Plugin",
-  "version": "2.0.0-alpha.6",
+  "description": "jQuery Once",
+  "version": "2.0.0-alpha.9",
   "main": "jquery.once.js",
   "ignore": [
     "*.json",
@@ -20,9 +20,9 @@
   },
   "devDependencies": {
     "grunt": "~0.4.5",
-    "grunt-contrib-jshint": "~0.10.0",
     "grunt-contrib-qunit": "~0.5.2",
     "grunt-contrib-uglify": "~0.6.0",
+    "grunt-eslint": "~1.1.0",
     "projectz": "~0.3.15"
   }
 }
\ No newline at end of file
diff --git a/component.json b/component.json
index 35ffb81..e952219 100644
--- a/component.json
+++ b/component.json
@@ -4,7 +4,7 @@
   "homepage": "http://github.com/robloach/jquery-once",
   "description": "Act on jQuery elements only once.",
   "license": "GPL-2.0",
-  "version": "2.0.0-alpha.6",
+  "version": "2.0.0-alpha.9",
   "keywords": [
     "jquery"
   ],
diff --git a/composer.json b/composer.json
index c5c7ab3..32cea87 100644
--- a/composer.json
+++ b/composer.json
@@ -1,25 +1,26 @@
 {
-    "name": "robloach/jquery-once",
-    "description": "Act on jQuery elements only once.",
-    "type": "component",
-    "license": [
-       "MIT",
-       "GPL-2.0"
-    ],
-    "require": {
-        "components/jquery": ">=2.1.1"
-    },
-    "extra": {
-        "component": {
-            "scripts": [
-                "jquery.once.js"
-            ],
-            "files": [
-                "jquery.once.min.js"
-            ],
-            "shim": {
-                "deps": ["jquery"]
-            }
-        }
+  "name": "robloach/jquery-once",
+  "description": "Act on jQuery elements only once.",
+  "type": "component",
+  "license": [
+    "MIT",
+    "GPL-2.0"
+  ],
+  "require": {
+    "components/jquery": ">=2.1.1"
+  },
+  "extra": {
+    "component": {
+      "scripts": [
+        "jquery.once.js"
+      ],
+      "files": [
+        "jquery.once.min.js",
+        "jquery.once.js.map"
+      ],
+      "shim": {
+        "deps": ["jquery"]
+      }
     }
+  }
 }
diff --git a/example/index.html b/example/index.html
index 6f9cfe9..7a2c13b 100644
--- a/example/index.html
+++ b/example/index.html
@@ -1,18 +1,24 @@
 <!DOCTYPE html>
 <html>
-    <head>
-        <script src="../node_modules/jquery/dist/jquery.js"></script>
-        <script src="../jquery.once.js"></script>
-    </head>
-    <body>
-        <h1>jQuery Once</h1>
-        <p>This is some text, which should stay green.</p>
-        <script>
-          // Change the color of the text to green.
-          $('p').once('changecolor').css('color', 'green');
+  <head>
+    <script src="../node_modules/jquery/dist/jquery.js"></script>
+    <script src="../jquery.once.js"></script>
+  </head>
+  <body>
+    <h1>jQuery Once</h1>
+    <p>This is some text, which should stay green.</p>
+    <script>
+      // Change the color of the text to green.
+      $('p').once('changecolor').css('color', 'green');
 
-          // Attempt to change the color again.
-          $('p').once('changecolor').css('color', 'red');
-        </script>
-    </body>
+      // Attempt to change the color again.
+      $('p').once('changecolor').css('color', 'red');
+
+      // Now change the background color.
+      $('p').once('changebackground').css('background-color', 'black');
+
+      // Change it again.
+      $('p').once('changebackground').css('background-color', 'yellow');
+    </script>
+  </body>
 </html>
diff --git a/jquery.once.js b/jquery.once.js
index 5deed57..a547c1a 100644
--- a/jquery.once.js
+++ b/jquery.once.js
@@ -13,7 +13,10 @@
     uuid = 0;
     $.fn.once = function(id) {
       var name;
-      name = "jquery-once-" + (id || ++uuid);
+      if (!id) {
+        throw new Error("An ID is required when calling jQuery.once()");
+      }
+      name = "jquery-once-" + id;
       return this.filter(function() {
         return $(this).data(name) !== true;
       }).data(name, true);
diff --git a/jquery.once.js.map b/jquery.once.js.map
index 31f3ae9..c8046f5 100644
--- a/jquery.once.js.map
+++ b/jquery.once.js.map
@@ -6,5 +6,5 @@
     "jquery.once.litcoffee"
   ],
   "names": [],
-  "mappings": ";AAaI;AAAA,EAAA,CAAC,SAAC,OAAD,GAAA;AACC,IAAA,IAAG,MAAA,CAAA,OAAA,KAAkB,QAArB;AACE,MAAA,OAAA,CAAQ,OAAA,CAAQ,QAAR,CAAR,CAAA,CADF;KAAA,MAEK,IAAG,MAAA,CAAA,MAAA,KAAiB,UAAjB,IAAgC,MAAM,CAAC,GAA1C;AACH,MAAA,MAAA,CAAO,CAAC,QAAD,CAAP,EAAmB,OAAnB,CAAA,CADG;KAAA,MAAA;AAGH,MAAA,OAAA,CAAQ,MAAR,CAAA,CAHG;KAHN;EAAA,CAAD,CAAA,CAQE,SAAC,CAAD,GAAA;AACA,QAAA,IAAA;AAAA,IAAA,IAAA,GAAO,CAAP,CAAA;AAAA,IA4BA,CAAC,CAAC,EAAE,CAAC,IAAL,GAAY,SAAC,EAAD,GAAA;AAGV,UAAA,IAAA;AAAA,MAAA,IAAA,GAAO,cAAA,GAAiB,CAAC,EAAA,IAAM,EAAA,IAAP,CAAxB,CAAA;aAGA,IAAC,CAAA,MAAD,CAAQ,SAAA,GAAA;eACN,CAAA,CAAE,IAAF,CAAO,CAAC,IAAR,CAAa,IAAb,CAAA,KAAwB,KADlB;MAAA,CAAR,CAEA,CAAC,IAFD,CAEM,IAFN,EAEY,IAFZ,EANU;IAAA,CA5BZ,CAAA;AAAA,IAkEA,CAAC,CAAC,EAAE,CAAC,UAAL,GAAkB,SAAC,EAAD,GAAA;aAEhB,IAAC,CAAA,QAAD,CAAU,EAAV,CAAa,CAAC,UAAd,CAAyB,cAAA,GAAiB,EAA1C,EAFgB;IAAA,CAlElB,CAAA;AAAA,IAiGA,CAAC,CAAC,EAAE,CAAC,QAAL,GAAgB,SAAC,EAAD,GAAA;AAEd,UAAA,IAAA;AAAA,MAAA,IAAA,GAAO,cAAA,GAAiB,EAAxB,CAAA;aACA,IAAC,CAAA,MAAD,CAAQ,SAAA,GAAA;eACN,CAAA,CAAE,IAAF,CAAO,CAAC,IAAR,CAAa,IAAb,CAAA,KAAsB,KADhB;MAAA,CAAR,EAHc;IAAA,CAjGhB,CADA;EAAA,CARF,CAAA,CAAA;AAAA"
+  "mappings": ";AAaI;AAAA,EAAA,CAAC,SAAC,OAAD,GAAA;AACC,IAAA,IAAG,MAAA,CAAA,OAAA,KAAkB,QAArB;AACE,MAAA,OAAA,CAAQ,OAAA,CAAQ,QAAR,CAAR,CAAA,CADF;KAAA,MAEK,IAAG,MAAA,CAAA,MAAA,KAAiB,UAAjB,IAAgC,MAAM,CAAC,GAA1C;AACH,MAAA,MAAA,CAAO,CAAC,QAAD,CAAP,EAAmB,OAAnB,CAAA,CADG;KAAA,MAAA;AAGH,MAAA,OAAA,CAAQ,MAAR,CAAA,CAHG;KAHN;EAAA,CAAD,CAAA,CAQE,SAAC,CAAD,GAAA;AACA,QAAA,IAAA;AAAA,IAAA,IAAA,GAAO,CAAP,CAAA;AAAA,IA0BA,CAAC,CAAC,EAAE,CAAC,IAAL,GAAY,SAAC,EAAD,GAAA;AAEV,UAAA,IAAA;AAAA,MAAA,IAAmE,CAAA,EAAnE;AAAA,cAAU,IAAA,KAAA,CAAM,8CAAN,CAAV,CAAA;OAAA;AAAA,MAGA,IAAA,GAAO,cAAA,GAAiB,EAHxB,CAAA;aAMA,IAAC,CAAA,MAAD,CAAQ,SAAA,GAAA;eACN,CAAA,CAAE,IAAF,CAAO,CAAC,IAAR,CAAa,IAAb,CAAA,KAAwB,KADlB;MAAA,CAAR,CAEA,CAAC,IAFD,CAEM,IAFN,EAEY,IAFZ,EARU;IAAA,CA1BZ,CAAA;AAAA,IAkEA,CAAC,CAAC,EAAE,CAAC,UAAL,GAAkB,SAAC,EAAD,GAAA;aAEhB,IAAC,CAAA,QAAD,CAAU,EAAV,CAAa,CAAC,UAAd,CAAyB,cAAA,GAAiB,EAA1C,EAFgB;IAAA,CAlElB,CAAA;AAAA,IAiGA,CAAC,CAAC,EAAE,CAAC,QAAL,GAAgB,SAAC,EAAD,GAAA;AAEd,UAAA,IAAA;AAAA,MAAA,IAAA,GAAO,cAAA,GAAiB,EAAxB,CAAA;aACA,IAAC,CAAA,MAAD,CAAQ,SAAA,GAAA;eACN,CAAA,CAAE,IAAF,CAAO,CAAC,IAAR,CAAa,IAAb,CAAA,KAAsB,KADhB;MAAA,CAAR,EAHc;IAAA,CAjGhB,CADA;EAAA,CARF,CAAA,CAAA;AAAA"
 }
\ No newline at end of file
diff --git a/jquery.once.litcoffee b/jquery.once.litcoffee
index 369b392..445e22a 100644
--- a/jquery.once.litcoffee
+++ b/jquery.once.litcoffee
@@ -29,10 +29,8 @@ Filter elements by whether they have not yet been processed.
 
 #### Parameters
 
-* `id` *(string)* The optional data id used to determine whether the given
-  elements have  already been processed or not. When id is not provided, it
-  becomes a unique identifier, depicted as a number. The element's data id will
-  then be represented in the form of `jquery-once-#`.
+* `id` The data id used to determine whether the given elements have already
+been processed or not.
 
 #### Returns
 
@@ -49,9 +47,11 @@ $('p').once('changecolor').css('color', 'green');
 #### Source
 
       $.fn.once = (id) ->
-        # Build the name for the data identifier. Generate a new unique id if
-        # the id parameter is not provided.
-        name = "jquery-once-" + (id or ++uuid)
+        # The id parameter is required.
+        throw new Error("An ID is required when calling jQuery.once()") if not id
+
+        # Build the name for the data identifier.
+        name = "jquery-once-" + id
 
         # Filter the elements by which do not have the data yet.
         @filter ->
diff --git a/jquery.once.min.js b/jquery.once.min.js
index 5c222a8..45302c6 100644
--- a/jquery.once.min.js
+++ b/jquery.once.min.js
@@ -1,4 +1,4 @@
-/*! jQuery Once - v2.0.0-alpha.6 - 10/7/2014 - https://github.com/RobLoach/jquery-once
- * (c) 2014 Rob Loach (http://github.com/robloach)
+/*! jQuery Once - v2.0.0-alpha.9 - 10/16/2014 - https://github.com/RobLoach/jquery-once
+ * (c) 2014 Rob Loach (http://github.com/RobLoach)
  * Licensed GPL-2.0, MIT */
-!function(a){"use strict";"object"==typeof exports?a(require("jquery")):"function"==typeof define&&define.amd?define(["jquery"],a):a(jQuery)}(function(a){"use strict";var b={},c=0;a.fn.once=function(d){"string"!=typeof d&&(d in b||(b[d]=++c),d=b[d]);var e="jquery-once-"+d;return this.filter(function(){return a(this).data(e)!==!0}).data(e,!0)},a.fn.removeOnce=function(a){return this.findOnce(a).removeData("jquery-once-"+a)},a.fn.findOnce=function(b){var c="jquery-once-"+b;return this.filter(function(){return a(this).data(c)===!0})}});
\ No newline at end of file
+!function(a){"use strict";"object"==typeof exports?a(require("jquery")):"function"==typeof define&&define.amd?define(["jquery"],a):a(jQuery)}(function(a){"use strict";a.fn.once=function(b){if(!b)throw new Error("An ID is required when calling jQuery.once()");var c="jquery-once-"+b;return this.filter(function(){return a(this).data(c)!==!0}).data(c,!0)},a.fn.removeOnce=function(a){return this.findOnce(a).removeData("jquery-once-"+a)},a.fn.findOnce=function(b){var c="jquery-once-"+b;return this.filter(function(){return a(this).data(c)===!0})}});
\ No newline at end of file
diff --git a/once.jquery.json b/once.jquery.json
index d8323ae..d562ac2 100644
--- a/once.jquery.json
+++ b/once.jquery.json
@@ -1,30 +1,30 @@
 {
-    "name": "once",
-    "title": "jQuery Once",
-    "description": "Act on jQuery elements only once.",
-    "keywords": [
-        "jquery",
-        "once"
-    ],
-    "version": "2.0.0-alpha.6",
-    "author": {
-        "name": "Rob Loach",
-        "url": "http://robloach.net"
+  "name": "once",
+  "title": "jQuery Once",
+  "description": "Act on jQuery elements only once.",
+  "keywords": [
+    "jquery",
+    "once"
+  ],
+  "version": "2.0.0-alpha.9",
+  "author": {
+    "name": "Rob Loach",
+    "url": "http://robloach.net"
+  },
+  "licenses": [
+    {
+      "type": "GPL-2.0",
+      "url": "http://opensource.org/licenses/gpl-2.0.php"
     },
-    "licenses": [
-        {
-            "type": "GPL-2.0",
-            "url": "http://opensource.org/licenses/gpl-2.0.php"
-        },
-        {
-            "type": "MIT",
-            "url": "http://opensource.org/licenses/MIT"
-        }
-    ],
-    "bugs": "https://github.com/RobLoach/jquery-once/issues",
-    "homepage": "https://github.com/RobLoach/jquery-once",
-    "download": "https://github.com/RobLoach/jquery-once/archive/master.zip",
-    "dependencies": {
-        "jquery": "~2.1.1"
+    {
+      "type": "MIT",
+      "url": "http://opensource.org/licenses/MIT"
     }
+  ],
+  "bugs": "https://github.com/RobLoach/jquery-once/issues",
+  "homepage": "https://github.com/RobLoach/jquery-once",
+  "download": "https://github.com/RobLoach/jquery-once/archive/master.zip",
+  "dependencies": {
+    "jquery": "~2.1.1"
+  }
 }
diff --git a/package.json b/package.json
index b43b57d..b617297 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "jquery-once",
   "title": "jQuery Once",
   "description": "Act on jQuery elements only once.",
-  "version": "2.0.0-alpha.6",
+  "version": "2.0.0-alpha.9",
   "keywords": [
     "jquery"
   ],
@@ -52,15 +52,17 @@
     "coffee-script": "~1.8.0",
     "coffeelint": "~1.6.1",
     "grunt": "~0.4.5",
-    "grunt-contrib-coffee": "~0.12.0",
     "grunt-contrib-qunit": "~0.5.2",
     "grunt-contrib-uglify": "~0.6.0",
-    "projectz": "~0.3.15"
+    "projectz": "~0.3.15",
+    "qunitjs": "~1.15.0"
   },
   "scripts": {
     "compile": "./node_modules/.bin/coffee -m -c *.litcoffee",
-    "test": "./node_modules/.bin/coffeelint *.litcoffee && grunt qunit",
-    "projectz": "node_modules/.bin/projectz compile",
-    "release": "npm run-script compile && grunt release"
+    "coffeelint": "./node_modules/.bin/coffeelint *.litcoffee",
+    "test": "npm run-script coffeelint && npm run-script compile && npm run-script qunit",
+    "qunit": "grunt qunit",
+    "projectz": "./node_modules/.bin/projectz compile",
+    "release": "npm run-script compile && grunt release && npm run-script projectz"
   }
 }
diff --git a/test/index.html b/test/index.html
index 038db22..6a0293f 100644
--- a/test/index.html
+++ b/test/index.html
@@ -2,7 +2,7 @@
 <html>
 <head>
   <title>jQuery Once - Test Suite</title>
-  <link rel="stylesheet" href="http://code.jquery.com/qunit/qunit-1.11.0.css">
+  <link rel="stylesheet" href="../node_modules/qunitjs/qunit/qunit.css">
 </head>
 <body id="body">
   <div id="qunit"></div>
@@ -31,8 +31,8 @@
 
   </div>
 
-  <script src="http://code.jquery.com/jquery-2.1.1.js"></script>
-  <script src="http://code.jquery.com/qunit/qunit-1.11.0.js"></script>
+  <script src="../node_modules/jquery/dist/jquery.js"></script>
+  <script src="../node_modules/qunitjs/qunit/qunit.js"></script>
   <script src="../jquery.once.js"></script>
   <script src="test.js"></script>
 </body>
diff --git a/test/test.js b/test/test.js
index 88d59e7..44ab452 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1,12 +1,26 @@
-test("Properly executed", function() {
-  // Create one once() call.
-  $('#test1 span').once().data('test1', 'foobar');
+test("ID required", function() {
+  expect(1);
+  try {
+    $("#test1 span").once();
+  }
+  catch (e) {
+    ok(e, "Error is triggered when ID is missing.");
+  }
+});
+
+test(".once('test1-2') properly executed", function() {
+  // Create one once('test1-2') call.
+  $('#test1 span').once('test1-2').data('test1-2', 'foo');
+
+  // Create another once('test1-2') call.
+  $('#test1 span').once('test1-2').data('test1-2', 'bar');
 
-  var data = $('#test1 span').data('test1');
-  ok(data === "foobar");
+  // The data should result to the first once() call.
+  var data = $('#test1 span').data('test1-2');
+  ok(data === "foo");
 });
 
-test("Called only once", function() {
+test("Called only once, counted", function() {
   // Count the number of times once() was called.
   $('#test2 span').data('count', 0);