test: modernize prepare-dynamic-steps tests to use node:test

(cherry picked from commit 8b89dd8)

Author: dominykas

.github/actions/prepare-dynamic-steps/.gitignore

@@ -1,14 +1,11 @@
 'use strict';
 
-process.on('unhandledRejection', (err) => {
+const Assert = require('node:assert');
+const Fs = require('node:fs');
+const Os = require('node:os');
+const Path = require('node:path');
+const { describe, it, beforeEach } = require('node:test');
 
-    throw err;
-});
-
-
-const Assert = require('assert');
-const Fs = require('fs');
-const Path = require('path');
 const PrepareDynamicStepsAction = require('..');
 
 
@@ -20,34 +17,36 @@ runs:
     - run: echo ohai again
 `;
 
-
-exports.main = function () {
+describe('PrepareDynamicStepsAction', () => {
 
     const originalEnv = { ...process.env };
 
-    const tmpFolder = Path.join(__dirname, '.tmp', `${Date.now()}`);
+    let tmpFolder;
+
+    beforeEach(() => {
 
-    try {
+        tmpFolder = Fs.mkdtempSync(`${Os.tmpdir()}${Path.sep}prepare-dynamic-steps-action-test-`);
 
         Fs.mkdirSync(tmpFolder, { recursive: true });
         process.chdir(tmpFolder);
+    });
+
+    it('creates a file when INPUT_STEPS contains valid yaml', () => {
 
         process.env = { ...originalEnv, INPUT_PATH: 'test1', INPUT_STEPS: '- run: echo ohai\n- run: echo ohai again' };
         PrepareDynamicStepsAction.main();
         Assert.strictEqual(Fs.readFileSync(Path.join(tmpFolder, '.github', 'tmp', 'test1', 'action.yaml')).toString().trim(), expectedResult1.trim());
+    });
+
+    it('throws when INPUT_STEPS contains invalid yaml', () => {
 
         process.env = { ...originalEnv, INPUT_PATH: 'test2', INPUT_STEPS: '- item\n-invalid' };
         Assert.throws(() => PrepareDynamicStepsAction.main(), { message: 'Invalid `steps` - unable to parse YAML.' });
+    });
+
+    it('throws when INPUT_STEPS does not contain an array', () => {
 
         process.env = { ...originalEnv, INPUT_PATH: 'test3', INPUT_STEPS: 'not an array' };
         Assert.throws(() => PrepareDynamicStepsAction.main(), { message: 'Invalid `steps` - not an array.' });
-    }
-    finally {
-        Fs.rmSync(Path.join(__dirname, '.tmp'), { recursive: true });
-    }
-};
-
-
-if (require.main === module) {
-    exports.main();
-}
+    });
+});