generalise report tmp file

Author: zorkow

testsuite/src/constants.js

@@ -1 +1,5 @@
-export const tmpJsonFile = '/tmp/test.json';
+import * as os from 'os';
+
+export const tmpJsonFile = os.tmpdir() + '/test.json';
+export const ESC = '\u001B';
+

testsuite/src/texReporter.js

@@ -2,11 +2,9 @@
  *  Custom reporter for tex macro coverage.
  */
 
-import {tmpJsonFile} from './constants.js';
+import { tmpJsonFile, ESC } from './constants.js';
 import * as fs from 'fs';
 
-const ESC = '\u001B';
-
 export default class TexReporter {
 
   constructor(globalConfig, reporterOptions, reporterContext) {