Adding dataset test.

tests/dataset/config.yml

@@ -0,0 +1,5 @@
+---
+  r: 2
+  spec: "http://www.w3.org/TR/html5/elements.html#embedding-custom-non-visible-data-with-the-data-attributes"
+  sources: ["http://www.w3c-test.org/html/tests/approved/dataset/dataset-get.html"]
+  title: "Custom Data Attributes"

tests/dataset/test.js

@@ -0,0 +1,103 @@
+test("Dataset", function() {
+  assert( !!document.createElement("div").dataset, "Dataset supported" );
+});
+
+test("Dataset Implementation", function() {
+  var DOMStringMap = window.DOMStringMap,
+      fixture = document.createElement("div"),
+      instance, length;
+
+  // Avoid exceptions in Android #278
+  if ( !fixture.dataset ) {
+    instance = false;
+    length = 0;
+  } else {
+    fixture.dataset.beta = "b";
+    instance = (fixture.dataset instanceof DOMStringMap);
+    length = Object.keys(fixture.dataset).length;
+  }
+
+  assert( instance, "fixture.dataset property is DOMStringMap" );
+  assert( length === 1, "fixture.dataset.length expects 1" );
+});
+
+test("Dataset Interop with Attributes", function() {
+  var fixture = document.createElement("div"),
+      attr, value;
+
+  // Avoid exceptions in Android #278
+  if ( !fixture.dataset ) {
+    attr = "";
+    value = "";
+  } else {
+    fixture.setAttribute( "data-alpha", "a" );
+    fixture.dataset.beta = "b";
+
+    attr = fixture.getAttribute("data-beta");
+    value = fixture.dataset.alpha;
+  }
+
+  assert( attr === "b", "fixture.getAttribute('data-beta') === 'b' (set with dataset)" );
+  assert( value === "a", "fixture.dataset.alpha === 'a' (set with setAttribute)" );
+});
+
+test("Dataset Get*", function() {
+  var fixture = document.createElement("div");
+
+  // Avoid exceptions in Android #278
+  if ( !fixture.dataset ) {
+    assert( false, "Dataset not supported, not running get* tests" );
+  } else {
+    fixture.setAttribute( "data-alpha", "a" );
+    fixture.dataset.beta = "b";
+
+    assert( fixture.getAttribute("data-beta") === "b", "compatible get with getAttribute" );
+    assert( fixture.dataset.alpha === "a", "compatible set with setAttribute" );
+
+    [
+      [ "data-foo", "foo" ],
+      [ "data-foo-bar", "fooBar" ],
+      [ "data--", "-" ],
+      [ "data--foo", "Foo" ],
+      [ "data---foo", "-Foo" ],
+      [ "data-Foo", "foo" ],
+      [ "data-", "" ],
+      [ "data-\xE0", "\xE0" ]
+    ].forEach(function( array, index ) {
+
+      var fixture = document.createElement("div"),
+          value = index + "";
+
+      fixture.setAttribute( array[0], index + "" );
+
+      assert( fixture.dataset[ array[1] ] === value, "Expected: " + array.join(" = ") );
+    });
+  }
+});
+
+test("Dataset Enumerable", function() {
+  var fixture = document.createElement("div"),
+      actuals = [ "hello", "helloWorld", "ohHai" ],
+      length = actuals.length,
+      prop;
+
+  // Avoid exceptions in Android #278
+  if ( !fixture.dataset ) {
+    assert( false, "Dataset not supported, not running Enumerable tests" );
+  } else {
+    fixture.setAttribute( "data-hello", 1 );
+    fixture.setAttribute( "data-hello-world", 2 );
+    fixture.setAttribute( "data-oh-hai", 2 );
+
+    // This fails b/c Object.propertyIsEnumerable returns false...
+    // turns out these properties don't have property descriptors
+    // assert( Object.propertyIsEnumerable(fixture.dataset.ohHai) );
+    for ( prop in fixture.dataset ) {
+      actuals.splice( actuals.indexOf( prop ), 1 );
+      length--;
+      assert( actuals.length === length, prop );
+    }
+
+    assert( !actuals.length, "Expecting length === 0" );
+  }
+});