add a test

test/issues/0682.js

@@ -0,0 +1,12 @@
+'use strict';
+
+const assert = require('assert');
+const fs     = require('fs');
+const yaml   = require('../..');
+
+
+it('Should serialize strings with tabs as blocks', function () {
+  const expected = fs.readFileSync(require('path').join(__dirname, '/0682.yml'), 'utf8');
+  const result = yaml.dump({ value: 'a\n\tb' });
+  assert.strictEqual(expected, result);
+});

test/issues/0682.yml

@@ -0,0 +1,3 @@
+value: |-
+  a
+  	b