Add a test for stream_color.js (pick_color).

(imported from commit a49f96a4a7b61ef51c057e8a3f11c116d77ebb49)

static/js/stream_color.js

@@ -180,3 +180,6 @@ exports.get_color_class = _.memoize(function (color) {
 return exports;
 
 }());
+if (typeof module !== 'undefined') {
+    module.exports = stream_color;
+}

tools/test-js-with-node

@@ -9,6 +9,7 @@ export NODE_PATH=$STATIC_DIR
 NODEJS=$(which nodejs || which node)
 
 $NODEJS filter.js
+$NODEJS stream_color.js
 $NODEJS util.js
 $NODEJS message_list.js
 $NODEJS message_tour.js

zerver/tests/frontend/node/stream_color.js

@@ -0,0 +1,21 @@
+var assert = require('assert');
+
+(function set_up_dependencies () {
+    global._ = require('third/underscore/underscore.js');
+    global.$ = function (f) {};
+    global.stream_color = require('js/stream_color.js');
+}());
+
+var stream_color = global.stream_color;
+
+(function test_pick_color () {
+    var used_colors = ["#76ce90", "#fae589"];
+
+    // Colors are assigned randomly, so this test is a little vague and brittle,
+    // but we can verify a few things, like not reusing colors and making sure
+    // the color has length 7.
+    var color = stream_color.pick_color(used_colors);
+    assert.notEqual(color, "#76ce90");
+    assert.notEqual(color, "#fae589");
+    assert.equal(color.length, 7);
+}());