Update test framework: fix run_tests.py to support all test files, add auto-import-check for test files

node_modules/@actions/exec/README.md

@@ -0,0 +1,57 @@
+# `@actions/exec`
+
+## Usage
+
+#### Basic
+
+You can use this package to execute tools in a cross platform way:
+
+```js
+const exec = require('@actions/exec');
+
+await exec.exec('node index.js');
+```
+
+#### Args
+
+You can also pass in arg arrays:
+
+```js
+const exec = require('@actions/exec');
+
+await exec.exec('node', ['index.js', 'foo=bar']);
+```
+
+#### Output/options
+
+Capture output or specify [other options](https://github.com/actions/toolkit/blob/d9347d4ab99fd507c0b9104b2cf79fb44fcc827d/packages/exec/src/interfaces.ts#L5):
+
+```js
+const exec = require('@actions/exec');
+
+let myOutput = '';
+let myError = '';
+
+const options = {};
+options.listeners = {
+  stdout: (data: Buffer) => {
+    myOutput += data.toString();
+  },
+  stderr: (data: Buffer) => {
+    myError += data.toString();
+  }
+};
+options.cwd = './lib';
+
+await exec.exec('node', ['index.js', 'foo=bar'], options);
+```
+
+#### Exec tools not in the PATH
+
+You can specify the full path for tools not in the PATH:
+
+```js
+const exec = require('@actions/exec');
+
+await exec.exec('"/path/to/my-tool"', ['arg1']);
+```