Add property based tests to assess load reverses dump

package.json

@@ -36,6 +36,7 @@
     "browserify": "^14.3.0",
     "codemirror": "^5.13.4",
     "eslint": "^4.1.1",
+    "fast-check": "0.0.10",
     "istanbul": "^0.4.5",
     "mocha": "^3.3.0",
     "uglify-js": "^3.0.1"

test/40-properties.js

@@ -0,0 +1,16 @@
+'use strict';
+
+
+var path = require('path');
+var fs   = require('fs');
+
+
+suite('Properties', function () {
+  var directory = path.resolve(__dirname, 'properties');
+
+  fs.readdirSync(directory).forEach(function (file) {
+    if (path.extname(file) === '.js') {
+      require(path.resolve(directory, file));
+    }
+  });
+});

test/properties/identity.js

@@ -0,0 +1,21 @@
+'use strict';
+
+
+var assert = require('assert');
+var fc     = require('fast-check');
+var yaml   = require('../../');
+
+
+test('Load from dumped object should be the original object', function () {
+  var key = fc.string();
+  var values = [ fc.boolean(), fc.integer(), fc.double(), fc.string(), fc.constant(null) ];
+  var yamlArbitrary = fc.object({ key: key, values: values });
+
+  fc.assert(fc.property(
+    yamlArbitrary,
+    function (obj) {
+      var yamlContent = yaml.safeDump(obj);
+      assert.ok(typeof yamlContent === 'string');
+      assert.deepEqual(yaml.safeLoad(yamlContent), obj);
+    }));
+});