Write test file directly because grunt keeps getting EEXIST errors fr…

…om mkdir.

test/unit-tests.js

@@ -1,3 +1,4 @@
+const fs = require('fs');
 const grunt = require('grunt');
 const jsonlint = require('@prantlf/jsonlint');
 const validator = require('@prantlf/jsonlint/lib/validator');
@@ -265,11 +266,12 @@ function testReformattingFile(indent) {
   }
 
   // Build an unformatted file for testing.
-  grunt.file.write(`${__dirname}/reformat-this.json`, '{"somethingsomething":"something","something":"dark side"}');
+  fs.writeFileSync(`${__dirname}/reformat-this.json`, '{"somethingsomething":"something","something":"dark side"}', 'utf8');
 
   runWithFiles(grunt, jsonlint, [ 'test/reformat-this.json' ], options);
 
-  const formatted = grunt.file.read(`${__dirname}/reformat-this.json`);
+  // const formatted = grunt.file.read(`${__dirname}/reformat-this.json`);
+  const formatted = fs.readFileSync(`${__dirname}/reformat-this.json`, 'utf8');
   const lines = formatted.split(/\r?\n/);
   expect(lines).to.have.length(5);
   expect(lines[0]).to.be('{');