added unit testing for getCmsisPackRootPath (#214)

* added unit testing for getCmsisPackRootPath

* fixed a few lint errors

* correct a typo in unit test title

Co-authored-by: Jens Reinecke <[email protected]>

* correct typo in unit test title

Co-authored-by: Jens Reinecke <[email protected]>

* fixed an issue in the unit test

* fixed a lint issue

---------

Co-authored-by: Jens Reinecke <[email protected]>

Author: omarArm

src/utils.test.ts

@@ -0,0 +1,49 @@
+/**
+ * Copyright 2025 Arm Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+jest.mock('path');
+import * as os from 'os';
+import * as path from 'path';
+import { getCmsisPackRootPath, isWindows } from './utils';
+
+const CMSIS_PACK_ROOT_DEFAULT = 'mock/path';
+describe('getCmsisPackRoot', () => {
+
+    afterEach(() => {
+        jest.clearAllMocks();
+    });
+
+    it('checks if CMSIS_PACK_ROOT already exists', () => {
+        const originalProcessEnv = process.env;
+        process.env = { ...originalProcessEnv, CMSIS_PACK_ROOT: CMSIS_PACK_ROOT_DEFAULT };
+        const returnValue = getCmsisPackRootPath();
+        expect(returnValue).toBe(CMSIS_PACK_ROOT_DEFAULT);
+        process.env = originalProcessEnv;
+    });
+
+    it('checks if CMSIS_PACK_ROOT has been added or not', () => {
+        const originalProcessEnv = process.env;
+        delete process.env['CMSIS_PACK_ROOT'];
+        const spy = jest.spyOn(path, 'join');
+        getCmsisPackRootPath();
+        if (isWindows) {
+            expect(spy).toHaveBeenCalledWith(process.env['LOCALAPPDATA'] ?? os.homedir(), 'Arm', 'Packs');
+        } else {
+            expect(spy).toHaveBeenCalledWith(os.homedir(), '.cache', 'arm', 'packs');
+        }
+        process.env = originalProcessEnv;
+    });
+});