diff --git a/package-lock.json b/package-lock.json
index 1e6eafd..20c43d9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -38,6 +38,7 @@
         "jest": "^29.7.0",
         "lint-staged": "^14.0.1",
         "prettier": "^3.0.3",
+        "stream-mock": "^2.0.5",
         "ts-jest": "^29.1.1",
         "typescript": "^5.2.2"
       }
@@ -6246,6 +6247,15 @@
         "node": ">=8"
       }
     },
+    "node_modules/stream-mock": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/stream-mock/-/stream-mock-2.0.5.tgz",
+      "integrity": "sha512-dx9skT8QYjwLsal+MhGHr4UtgS49brw851C/oTixmhCi4Ip+/qnZmhV1qOcznYYAED6gYKmKea+jjza4/wjpSg==",
+      "dev": true,
+      "engines": {
+        "node": "8.* || >= 10.*"
+      }
+    },
     "node_modules/string_decoder": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
diff --git a/package.json b/package.json
index 22e19f8..b3ef03d 100644
--- a/package.json
+++ b/package.json
@@ -75,6 +75,7 @@
     "jest": "^29.7.0",
     "lint-staged": "^14.0.1",
     "prettier": "^3.0.3",
+    "stream-mock": "^2.0.5",
     "ts-jest": "^29.1.1",
     "typescript": "^5.2.2"
   }
diff --git a/src/tasks/create-express-task.ts b/src/tasks/create-express-task.ts
index 3cdf081..f19d7d1 100644
--- a/src/tasks/create-express-task.ts
+++ b/src/tasks/create-express-task.ts
@@ -28,7 +28,7 @@ const copyAsync = promisify(ncp);
  * @param {string} projectDescription - The description of the xarvis project.
  * @returns {stream.Transform} A transform stream that replaces placeholders with provided values.
  */
-const transformTemplateWithConfig = (projectName: string, projectDescription: string): stream.Transform => {
+export const transformTemplateWithConfig = (projectName: string, projectDescription: string): stream.Transform => {
   return new stream.Transform({
     transform(chunk, _, callback) {
       let modifiedChunk = chunk.toString('utf8');
diff --git a/tests/tasks/create-express-task.test.ts b/tests/tasks/create-express-task.test.ts
new file mode 100644
index 0000000..67e098a
--- /dev/null
+++ b/tests/tasks/create-express-task.test.ts
@@ -0,0 +1,29 @@
+import { transformTemplateWithConfig } from '../../src/tasks/create-express-task';
+import { ObjectWritableMock } from 'stream-mock';
+
+describe('CreateExpressTask', () => {
+  describe('transformTemplateWithConfig', () => {
+    it('should replace project name and description in the stream', (done) => {
+      const projectName = 'xarvis';
+      const description = 'a CLI tool to generate production ready apps';
+
+      const input = 'Project name: {{project_name}}, and this is {{project_description}}';
+      const expectedOutput = `Project name: ${projectName}, and this is ${description}`;
+
+      const transformStream = transformTemplateWithConfig(projectName, description);
+      const writableStream = new ObjectWritableMock();
+
+      transformStream.write(input, 'utf-8', () => {
+        transformStream.end();
+      });
+
+      transformStream.pipe(writableStream);
+
+      writableStream.on('finish', () => {
+        const transformedData = writableStream.data.toString();
+        expect(transformedData).toEqual(expectedOutput);
+        done();
+      });
+    });
+  });
+});