Added a test case to show the regression

Author: Larry Yu

.github/workflows/ci.yml

@@ -115,6 +115,8 @@ jobs:
           # Environment variables from config
           - ./node_modules/.bin/ember try:each --config-path='../test/fixtures/dummy-ember-try-config-different-env-vars.js'
 
+          # fs-extra versions 7.x and above caused a regresion
+          - ./node_modules/.bin/ember try:each --config-path='../test/fixtures/dummy-ember-try-config-fs-extra-scenarios.js'
 
     steps:
       - uses: actions/checkout@v1

test/fixtures/dummy-ember-try-config-fs-extra-scenarios.js

@@ -0,0 +1,24 @@
+module.exports = {
+  scenarios: [
+    {
+      name: 'Ember try should succeed when using fs-extra version 6.x',
+      npm: {
+        devDependencies: {
+          'watchpack-chokidar2': '2.0.1',
+          'ember-try-test-suite-helper': '1.0.0',
+          'fs-extra': '6.0.1',
+        },
+      },
+    },
+    {
+      name: 'Ember try should fail when using fs-extra version 9.x',
+      npm: {
+        devDependencies: {
+          'watchpack-chokidar2': '2.0.1',
+          'ember-try-test-suite-helper': '1.0.0',
+          'fs-extra': '9.0.1',
+        },
+      },
+    },
+  ],
+};