rename tmp file, cannot start with dot

Author: ShMcK

lib/reducers/task-tests/task-tests.js

@@ -6,7 +6,7 @@ function taskTestsReducer(taskTests, action) {
     if (taskTests === void 0) { taskTests = ''; }
     switch (action.type) {
         case Type.SET_PAGE:
-            var target = path.join(window.coderoad.tutorialDir || window.coderoad.dir, ".tmp" + window.coderoad.suffix);
+            var target = path.join(window.coderoad.tutorialDir || window.coderoad.dir, "_tmp" + window.coderoad.suffix);
             return concat_tests_1.concatTests(target, action.payload.taskTests);
         default:
             return taskTests;

src/reducers/task-tests/task-tests.ts

@@ -6,7 +6,7 @@ import {concatTests} from './concat-tests';
 export default function taskTestsReducer(taskTests = '', action: CR.Action): string {
   switch (action.type) {
     case Type.SET_PAGE:
-      let target = path.join(window.coderoad.tutorialDir || window.coderoad.dir, `.tmp${window.coderoad.suffix}`);
+      let target = path.join(window.coderoad.tutorialDir || window.coderoad.dir, `_tmp${window.coderoad.suffix}`);
       return concatTests(target, action.payload.taskTests);
     default:
       return taskTests;