diff --git a/tests/bugs/issue773.js b/tests/bugs/issue773.js
new file mode 100644
index 0000000..14dfeac
--- /dev/null
+++ b/tests/bugs/issue773.js
@@ -0,0 +1,16 @@
+
+'use strict';
+const util = require('../lib/test-utils.js');
+const expect = require('chai').expect;
+
+describe('unexpected failures when calling fs functions (e.g. writeFile) with empty options object, issue773', function() {
+  beforeEach(util.setup);
+  afterEach(util.cleanup);
+
+  it('should call fs.writeFile with an empty options object', function(done) {
+    const fs = util.fs();
+    fs.writeFile('/a', 'trololol', {}, (err) => {
+      done();
+    });
+  });
+});
diff --git a/tests/index.js b/tests/index.js
index e9245e6..4287ccc 100644
--- a/tests/index.js
+++ b/tests/index.js
@@ -89,6 +89,7 @@ require('./bugs/issue267.js');
 require('./bugs/issue270.js');
 require('./bugs/rename-dir-trailing-slash.js');
 require('./bugs/issue357.js');
+require('./bugs/issue773.js');
 
 // Sample code from README
 require('./spec/readme.example.spec');