test: add test for isJsFile utility (#1379)

Co-authored-by: Adi-204 <adiboghawala@gmail.com>
Co-authored-by: Chan <bot+chan@asyncapi.io>

Author: Adi-204

apps/generator/test/utils.test.js

@@ -73,4 +73,27 @@ describe('Utils', () => {
       expect(exists).toBeFalsy();
     });
   });
+
+  describe('#isJsFile',() => {
+    it('should return true if file extension is .js', () => {
+      const isJsFile = utils.isJsFile('./valid-file.js');
+      expect(isJsFile).toBeTruthy();
+    });
+    it('should return true if file extension is .jsx', () => {
+      const isJsFile = utils.isJsFile('./valid-file.jsx');
+      expect(isJsFile).toBeTruthy();
+    });
+    it('should return true if file extension is .cjs', () => {
+      const isJsFile = utils.isJsFile('./valid-file.cjs');
+      expect(isJsFile).toBeTruthy();
+    });
+    it('should return false if it is not a JS file', () => {
+      const isJsFile = utils.isJsFile('./invalid-file.txt');
+      expect(isJsFile).toBeFalsy();
+    });
+    it('should return false if it is not a JS file', () => {
+      const isJsFile = utils.isJsFile('./invalid-file');
+      expect(isJsFile).toBeFalsy();
+    });
+  });
 });