Added mock-fs based test.

Author: neogeek

package.json

@@ -19,7 +19,8 @@
     "codecov": "1.0.1",
     "eslint": "3.8.1",
     "istanbul": "0.4.5",
-    "mocha": "3.1.2"
+    "mocha": "3.1.2",
+    "mock-fs": "3.11.0"
   },
   "scripts": {
     "test": "make lint && make coverage"

test/specs/doxdox.js

@@ -1,6 +1,8 @@
 const assert = require('assert');
 const fs = require('fs');
 
+const mock = require('mock-fs');
+
 const doxdox = require('../../lib/doxdox');
 
 describe('doxdox', () => {
@@ -19,6 +21,32 @@ describe('doxdox', () => {
 
     });
 
+    describe('parseInput', () => {
+
+        before(() => {
+
+            mock();
+
+        });
+
+        it('fails to parse input from invalid file', done => {
+
+            doxdox.parseInput('', {'parser': 'dox'}).catch(err => {
+
+                done();
+
+            });
+
+        });
+
+        after(() => {
+
+            mock.restore();
+
+        });
+
+    });
+
     describe('parseInputs', () => {
 
         it('parses multiple input from array', done => {