Added Unit tests (#15)

* Added unit tests for Azure PowerShell

* Added unit tests

* changes in utils

* removed babel

* changed variable name of enable-PSSession

* refactor

* added ci.yml

* changes in utils test

__tests__/PowerShell/Utilities/Utils.test.ts

@@ -0,0 +1,48 @@
+import Utils from '../../../src/PowerShell/Utilities/Utils';
+
+const version: string = '9.0.0';
+const moduleName: string = 'az';
+
+afterEach(() => {
+    jest.restoreAllMocks();
+});
+
+describe('Testing isValidVersion', () => {
+    const validVersion: string = '1.2.4';
+    const invalidVersion: string = 'a.bcd';
+
+    test('isValidVersion should be true', () => {
+        expect(Utils.isValidVersion(validVersion)).toBeTruthy();
+    });
+    test('isValidVersion should be false', () => {
+        expect(Utils.isValidVersion(invalidVersion)).toBeFalsy();
+    });
+});
+
+describe('Testing setPSModulePath', () => {
+    test('PSModulepath with azPSVersion non-empty', () => {
+        if(!process.env.PSModulePath) {
+            process.env.PSModulePath = process.env.PSModulePath + "modulePath";
+        }
+        Utils.setPSModulePath(version);
+        expect(process.env.PSModulepath).toContain(version);
+    });
+    test('PSModulePath with azPSVersion empty', () => {
+        const currPSModulePath = process.env.PSModulepath;
+        Utils.setPSModulePath();
+        expect(process.env.PSModulePath).not.toEqual(currPSModulePath);
+    });
+});
+
+describe('Testing getLatestModule', () => {
+    let getLatestModuleSpy;
+
+    beforeEach(() => {
+        getLatestModuleSpy = jest.spyOn(Utils, 'getLatestModule');
+    });
+    test('getLatestModule should pass', async () => {
+        getLatestModuleSpy.mockImplementationOnce((_moduleName: string) => Promise.resolve(version));
+        await Utils.getLatestModule(moduleName);
+        expect(getLatestModuleSpy).toHaveBeenCalled();
+    });
+});