diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/test/core/transition-test-style.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/test/core/transition-test-style.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,49 @@
+require("../env");
+require("../../d3");
+
+var assert = require("assert");
+
+module.exports = {
+  topic: function() {
+    var cb = this.callback;
+
+    var s = d3.select("body").append("div")
+        .style("background-color", "white")
+        .style("color", "red")
+        .style("display", "none")
+        .style("font-size", "20px");
+
+    var t = s.transition()
+        .style("display", null)
+        .style("font-size", function() { return null; })
+        .style("display", null)
+        .style("background-color", "green")
+        .style("background-color", "red")
+        .style("color", function() { return "green"; }, "important")
+        .each("end", function() { cb(null, {selection: s, transition: t}); });
+  },
+  "defines the corresponding style tween": function(result) {
+    assert.typeOf(result.transition.tween("style.background-color"), "function");
+    assert.typeOf(result.transition.tween("style.color"), "function");
+  },
+  "the last style operator takes precedence": function(result) {
+    assert.equal(result.selection.style("background-color"), "#ff0000");
+  },
+  "sets a property as a string": function(result) {
+    assert.equal(result.selection.style("background-color"), "#ff0000");
+  },
+  "sets a property as a function": function(result) {
+    assert.equal(result.selection.style("color"), "#008000");
+  },
+  "observes the specified priority": function(result) {
+    var style = result.selection.node().style;
+    assert.equal(style.getPropertyPriority("background-color"), "");
+    assert.equal(style.getPropertyPriority("color"), "important");
+  },
+  "removes a property using a constant null": function(result) {
+    assert.equal(result.selection.style("display"), "");
+  },
+  "removes a property using a function null": function(result) {
+    assert.equal(result.selection.style("font-size"), "");
+  }
+};