Add test for absolute path

Author: akshita31

test/unitTests/AbsolutePath.test.ts

@@ -0,0 +1,30 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { expect } from "chai";
+import { AbsolutePath } from "../../src/packageManager/AbsolutePath";
+import { TmpAsset, CreateTmpFile } from "../../src/CreateTmpAsset";
+import { join } from "path";
+
+suite(AbsolutePath.name, () => {
+    let tmpPath: TmpAsset;
+
+    setup(async () => {
+        tmpPath = await CreateTmpFile();   
+    });
+
+    teardown(() => {
+        tmpPath.dispose(); 
+    });
+    
+    test('Throws error when the passed value is not an absolute path', () => {
+        expect(() => new AbsolutePath("somePath")).to.throw(Error);
+    });
+
+    test(`${AbsolutePath.getAbsolutePath.name}: Returns an absolute path based by resolving the path with the value to prepend`, () => {
+        let absolutePath = AbsolutePath.getAbsolutePath(tmpPath.name, "somePath");
+        expect(absolutePath.value).to.be.equal(join(tmpPath.name, "somePath"));
+    });
+});