Test colors and comments

test/color.test.js

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+var assert = require('assert');
+var tree = require('../lib/carto/tree.js');
+require('../lib/carto/tree/color');
+
+describe('Color', function() {
+    describe('basic functionality', function() {
+        it('should be constructed', function() {
+            var f = new tree.Color([0, 0, 0], 1);
+            assert.deepEqual(f.toHSL(), {"h":0,"s":0,"l":0,"a":1});
+            assert.ok(f);
+        });
+    });
+});

test/comment.test.js

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+var assert = require('assert');
+var tree = require('../lib/carto/tree.js');
+require('../lib/carto/tree/comment');
+
+describe('Comment', function() {
+    describe('basic functionality', function() {
+        it('should be constructed', function() {
+            var f = new tree.Comment('hello world');
+            assert.deepEqual(f.toString(), '<!--hello world-->');
+            assert.deepEqual(f.ev(), f);
+            assert.ok(f);
+        });
+    });
+});