Add test for zip.

test/core/test-zip.js

@@ -1,24 +0,0 @@
-require("./../../lib/env-js/envjs/node");
-require("./../../d3");
-
-var s = JSON.stringify;
-
-console.log("zip [1, 2] [3, 4]:");
-console.log("  " + s(d3.zip([1, 2], [3, 4])));
-console.log("");
-
-console.log("zip [1, 2] [3, 4] [5, 6, 7]:");
-console.log("  " + s(d3.zip([1, 2], [3, 4], [5, 6, 7])));
-console.log("");
-
-console.log("zip [1, 2, 3, 4, 5] [2, 4, 6, 8, 10]:");
-console.log("  " + s(d3.zip([1, 2, 3, 4, 5], [2, 4, 6, 8, 10])));
-console.log("");
-
-console.log("zip [1, 2, 3, 4, 5]:");
-console.log("  " + s(d3.zip([1, 2, 3, 4, 5])));
-console.log("");
-
-console.log("zip (no arguments):");
-console.log("  " + s(d3.zip()));
-console.log("");

test/core/test-zip.out

@@ -1,15 +0,0 @@
-zip [1, 2] [3, 4]:
-  [[1,3],[2,4]]
-
-zip [1, 2] [3, 4] [5, 6, 7]:
-  [[1,3,5],[2,4,6]]
-
-zip [1, 2, 3, 4, 5] [2, 4, 6, 8, 10]:
-  [[1,2],[2,4],[3,6],[4,8],[5,10]]
-
-zip [1, 2, 3, 4, 5]:
-  [[1],[2],[3],[4],[5]]
-
-zip (no arguments):
-  []
-

test/core/zip-test.js

@@ -0,0 +1,32 @@
+require("../env");
+require("../../d3");
+
+var vows = require("vows"),
+    assert = require("assert");
+
+var suite = vows.describe("d3.zip");
+
+suite.addBatch({
+  "zip": {
+    topic: function() {
+      return d3.zip;
+    },
+    "transposes a square matrix": function(zip) {
+      assert.deepEqual(d3.zip([1, 2], [3, 4]), [[1, 3], [2, 4]]);
+    },
+    "transposes a non-square matrix": function(zip) {
+      assert.deepEqual(d3.zip([1, 2, 3, 4, 5], [2, 4, 6, 8, 10]), [[1, 2], [2, 4], [3, 6], [4, 8], [5, 10]]);
+    },
+    "transposes a single-row matrix": function(zip) {
+      assert.deepEqual(d3.zip([1, 2, 3, 4, 5]), [[1], [2], [3], [4], [5]]);
+    },
+    "transposes an empty matrix": function(zip) {
+      assert.deepEqual(d3.zip(), []);
+    },
+    "ignores extra elements given an irregular matrix": function(zip) {
+      assert.deepEqual(d3.zip([1, 2], [3, 4], [5, 6, 7]), [[1, 3, 5], [2, 4, 6]]);
+    }
+  }
+});
+
+suite.export(module);