diff --git a/test/core/transition-test-attr.js b/test/core/transition-test-attr.js
index 49743e0c..5fe62433 100644
--- a/test/core/transition-test-attr.js
+++ b/test/core/transition-test-attr.js
@@ -5,16 +5,29 @@ var assert = require("assert");
 
 module.exports = {
   topic: function() {
-    var callback = this.callback,
-        div = d3.select("body").append("div");
+    var cb = this.callback;
 
-    div
+    var s = d3.select("body").append("div")
         .attr("width", 20)
-      .transition()
+        .attr("color", "red");
+
+    var t = s.transition()
+        .attr("width", 100)
         .attr("width", 200)
-        .each("end", function() { callback(null, div); });
+        .attr("color", function() { return "green"; })
+        .each("end", function() { cb(null, {selection: s, transition: t}); });
   },
-  "sets an attribute as a number": function(div) {
-    assert.equal(div.attr("width"), "200");
+  "defines the corresponding attr tween": function(result) {
+    assert.typeOf(result.transition.tween("attr.width"), "function");
+    assert.typeOf(result.transition.tween("attr.color"), "function");
+  },
+  "the last attr operator takes precedence": function(result) {
+    assert.equal(result.selection.attr("width"), "200");
+  },
+  "sets an attribute as a number": function(result) {
+    assert.equal(result.selection.attr("width"), "200");
+  },
+  "sets an attribute as a function": function(result) {
+    assert.equal(result.selection.attr("color"), "rgb(0,128,0)");
   }
 };
diff --git a/test/core/transition-test-style.js b/test/core/transition-test-style.js
index 15f70b9e..39eb426b 100644
--- a/test/core/transition-test-style.js
+++ b/test/core/transition-test-style.js
@@ -14,7 +14,7 @@ module.exports = {
     var t = s.transition()
         .style("background-color", "green")
         .style("background-color", "red")
-        .style("color", "green", "important")
+        .style("color", function() { return "green"; }, "important")
         .each("end", function() { cb(null, {selection: s, transition: t}); });
   },
   "defines the corresponding style tween": function(result) {
@@ -25,6 +25,9 @@ module.exports = {
     assert.equal(result.selection.style("background-color"), "rgb(255,0,0)");
   },
   "sets a property as a string": function(result) {
+    assert.equal(result.selection.style("background-color"), "rgb(255,0,0)");
+  },
+  "sets a property as a function": function(result) {
     assert.equal(result.selection.style("color"), "rgb(0,128,0)");
   },
   "observes the specified priority": function(result) {
diff --git a/test/core/transition-test-styleTween.js b/test/core/transition-test-styleTween.js
index ac2aae5b..a10781aa 100644
--- a/test/core/transition-test-styleTween.js
+++ b/test/core/transition-test-styleTween.js
@@ -9,7 +9,8 @@ module.exports = {
         dd = [],
         ii = [],
         tt = [],
-        vv = [];
+        vv = [],
+        fails = 0;
 
     var s = d3.select("body").append("div").selectAll("div")
         .data(["red", "green"])
@@ -17,6 +18,7 @@ module.exports = {
         .style("background-color", function(d) { return d3.rgb(d)+""; });
 
     var t = s.transition()
+        .styleTween("background-color", function() { ++fails; })
         .styleTween("background-color", tween);
 
     function tween(d, i, v) {
@@ -29,7 +31,8 @@ module.exports = {
         data: dd,
         index: ii,
         value: vv,
-        context: tt
+        context: tt,
+        fails: fails
       });
       return i && d3.interpolateHsl(v, "blue");
     }
@@ -44,6 +47,9 @@ module.exports = {
   "defines the corresponding style tween": function(result) {
     assert.typeOf(result.transition.tween("style.background-color"), "function");
   },
+  "the last style tween takes precedence": function(result) {
+    assert.equal(result.fails, 0);
+  },
   "invokes the tween function": function(result) {
     assert.deepEqual(result.data, ["red", "green"], "expected data, got {actual}");
     assert.deepEqual(result.index, [0, 1], "expected data, got {actual}");