feat: use main.run in the tests instead

Author: aminya

__tests__/installer.test.ts

@@ -371,7 +371,13 @@ describe('setup-node', () => {
           200,
           path.join(__dirname, '__fixtures__', `mock-${fileName}`)
         );
-      await im.getNode(version, true, true, undefined, arch);
+
+      inputs['node-version'] = version;
+      inputs['node-arch'] = arch;
+      inputs['always-auth'] = false;
+      inputs['token'] = 'faketoken';
+      await main.run()
+
       const nodeDir = path.join(toolDir, 'node', version, arch);
 
       expect(scope.isDone()).toBe(true);