Respect eslint "fix" option and write any fix output back to disk.

lib/linter/index.js

@@ -40,6 +40,8 @@ exports.lint = function () {
     const engine = new Eslint.CLIEngine(configuration);
     const results = engine.executeOnFiles(['.']);
 
+    Eslint.CLIEngine.outputFixes(results);
+
     return results.results.map((result) => {
 
         return {

test/lint/eslint/fix/success.js

@@ -0,0 +1,14 @@
+'use strict';
+
+// Load modules
+
+
+// Declare internals
+
+const internals = {};
+
+
+exports.method = function (value) {
+
+  return value;
+};

test/linters.js

@@ -6,6 +6,7 @@ const Path = require('path');
 const _Lab = require('../test_runner');
 const Code = require('code');
 const Linters = require('../lib/lint');
+const Fs = require('fs');
 
 
 // Test shortcuts
@@ -151,6 +152,34 @@ describe('Linters - eslint', () => {
             done();
         });
     });
+
+    it('should work with fix option', (done) => {
+
+        // I would like to intercept a later call to writeFileSync and
+        // test that it is called correctly, then set `Fs.writeFileSync`
+        // back to its original function.  However, it seems I have
+        // a different copy of `Fs` here than the code being tested uses.
+        // To demonstrate this, I've set the value to null, which should
+        // cause the test to fail, but instead the test passes and changes
+        // to `test/lint/eslint/fix/success.js` are written to disk.
+        Fs.writeFileSync = null;
+
+        const lintOptions = JSON.stringify({ fix: true, dry: true });
+        const path = Path.join(__dirname, 'lint', 'eslint', 'fix');
+        Linters.lint({ lintingPath: path, linter: 'eslint', 'lint-options': lintOptions }, (err, result) => {
+
+            expect(err).to.not.exist();
+            expect(result).to.include('lint');
+
+            const eslintResults = result.lint;
+            expect(eslintResults).to.have.length(1);
+            expect(eslintResults[0]).to.include({
+                totalErrors: 0,
+                totalWarnings: 0
+            });
+            done();
+        });
+    });
 });
 
 describe('Linters - custom', () => {