Fix tests for update-environment==false

Author: mayeut

__tests__/find-pypy.test.ts

@@ -151,8 +151,11 @@ describe('findPyPyVersion', () => {
   let spyChmodSync: jest.SpyInstance;
   let spyCoreAddPath: jest.SpyInstance;
   let spyCoreExportVariable: jest.SpyInstance;
+  const env = process.env;
 
   beforeEach(() => {
+    jest.resetModules();
+    process.env = {...env};
     tcFind = jest.spyOn(tc, 'find');
     tcFind.mockImplementation((tool: string, version: string) => {
       const semverRange = new semver.Range(version);
@@ -214,6 +217,7 @@ describe('findPyPyVersion', () => {
     jest.resetAllMocks();
     jest.clearAllMocks();
     jest.restoreAllMocks();
+    process.env = env;
   });
 
   it('found PyPy in toolcache', async () => {

__tests__/finder.test.ts

@@ -28,17 +28,20 @@ const manifestData = require('./data/versions-manifest.json');
 describe('Finder tests', () => {
   let spyCoreAddPath: jest.SpyInstance;
   let spyCoreExportVariable: jest.SpyInstance;
+  const env = process.env;
 
   beforeEach(() => {
+    jest.resetModules();
+    process.env = {...env};
     spyCoreAddPath = jest.spyOn(core, 'addPath');
-
     spyCoreExportVariable = jest.spyOn(core, 'exportVariable');
   });
 
   afterEach(() => {
     jest.resetAllMocks();
     jest.clearAllMocks();
     jest.restoreAllMocks();
+    process.env = env;
   });
 
   it('Finds Python if it is installed', async () => {
@@ -66,7 +69,6 @@ describe('Finder tests', () => {
     await finder.useCpythonVersion('3.x', 'x64', false);
     expect(spyCoreAddPath).not.toHaveBeenCalled();
     expect(spyCoreExportVariable).not.toHaveBeenCalled();
-    expect(spyCoreExportVariable).not.toHaveBeenCalled();
   });
 
   it('Finds stable Python version if it is not installed, but exists in the manifest', async () => {