diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/test/core/selection-call-test.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/test/core/selection-call-test.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,71 @@
+require("../env");
+require("../../d3");
+
+var vows = require("vows"),
+    assert = require("assert");
+
+var suite = vows.describe("selection.call");
+
+suite.addBatch({
+  "select(body)": {
+    topic: function() {
+      return d3.select("body").html("");
+    },
+    "calls the function once": function(body) {
+      var count = 0;
+      body.call(function() { ++count; });
+      assert.equal(count, 1);
+    },
+    "passes any optional arguments": function(body) {
+      var abc;
+      body.call(function(selection, a, b, c) { abc = [a, b, c]; }, "a", "b", "c");
+      assert.deepEqual(abc, ["a", "b", "c"]);
+    },
+    "passes the selection as the first argument": function(body) {
+      var s;
+      body.call(function(selection) { s = selection; });
+      assert.isTrue(s === body);
+    },
+    "uses the selection as the context": function(body) {
+      var s;
+      body.call(function() { s = this; });
+      assert.isTrue(s === body);
+    },
+    "returns the current selection": function(body) {
+      assert.isTrue(body.call(function() {}) === body);
+    }
+  }
+});
+
+suite.addBatch({
+  "selectAll(div)": {
+    topic: function() {
+      return d3.select("body").html("").selectAll("div").data(d3.range(2)).enter().append("div");
+    },
+    "calls the function once": function(div) {
+      var count = 0;
+      div.call(function() { ++count; });
+      assert.equal(count, 1);
+    },
+    "passes any optional arguments": function(div) {
+      var abc;
+      div.call(function(selection, a, b, c) { abc = [a, b, c]; }, "a", "b", "c");
+      assert.deepEqual(abc, ["a", "b", "c"]);
+    },
+    "passes the selection as the first argument": function(div) {
+      var s;
+      div.call(function(selection) { s = selection; });
+      assert.isTrue(s === div);
+    },
+    "uses the selection as the context": function(div) {
+      var s;
+      div.call(function() { s = this; });
+      assert.isTrue(s === div);
+    },
+    "returns the current selection": function(div) {
+      assert.isTrue(div.call(function() {}) === div);
+    }
+  }
+});
+
+suite.export(module);