Add demo

demo/diff.test.js

@@ -0,0 +1,20 @@
+/*
+ * Demo error messages and diff rendering with Mocha.
+ */
+"use strict";
+
+var assert = require("..").assert;
+
+describe("diff", function() {
+    it("multiline string", function() {
+        assert.equals("foo\nbar\ndoo\n", "bar\ndoo\nxyz\n");
+    });
+
+    it("objects", function() {
+        assert.equals({ foo: 42 }, { foo: 66 });
+    });
+
+    it("matchJson", function() {
+        assert.matchJson('{"foo":42,"bar":true}', { foo: 42, bar: false });
+    });
+});

package.json

@@ -17,7 +17,8 @@
     "precommit": "lint-staged",
     "prepublishOnly": "npm run build && mkdocs gh-deploy -r upstream || mkdocs gh-deploy -r origin",
     "test": "mocha 'lib/**/*.test.js'",
-    "test-coverage": "nyc --reporter text --reporter html --reporter lcovonly npm run test"
+    "test-coverage": "nyc --reporter text --reporter html --reporter lcovonly npm run test",
+    "demo": "mocha demo/*.test.js"
   },
   "lint-staged": {
     "*.js": "eslint"