diff --git a/.eslintignore b/.eslintignore
index 35865b2..4291df0 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -1,4 +1,5 @@
 dist/
 jest.config.js
 tests/
-.eslintrc.cjs
\ No newline at end of file
+.eslintrc.cjs
+coverage/
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 04c01ba..94934f9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 node_modules/
-dist/
\ No newline at end of file
+dist/
+coverage/
\ No newline at end of file
diff --git a/src/error.ts b/src/error.ts
index c542a80..985e8b5 100644
--- a/src/error.ts
+++ b/src/error.ts
@@ -1,10 +1,10 @@
 export class RequestError extends Error {
 
-    public code: number;
+    public statusCode: number;
 
-    constructor(msg: string, code: number) {
+    constructor(msg: string, statusCode: number) {
         super(msg);
 
-        this.code = code;
+        this.statusCode = statusCode;
     }
 }
\ No newline at end of file
diff --git a/src/service.ts b/src/service.ts
index 3dcd894..70cb6f0 100644
--- a/src/service.ts
+++ b/src/service.ts
@@ -38,7 +38,7 @@ export default class Service {
             const rawRes = await this.adaptors[adaptor].request(`${req.service}.${req.subject}`, rawReq);
             const res: Response<U> = JSON.parse(rawRes);
 
-            if(res.statusCode < 200 || res.statusCode >= 599) {
+            if(res.statusCode < 200 || res.statusCode >= 299) {
                 throw new RequestError("error while request", res.statusCode);
             }
 
diff --git a/tests/error.test.ts b/tests/error.test.ts
new file mode 100644
index 0000000..757a308
--- /dev/null
+++ b/tests/error.test.ts
@@ -0,0 +1,11 @@
+import { RequestError } from "../src/error";
+
+test('request error', () => {
+    const expectedMsg = "This is my err";
+    const expectedStatusCode = 500;
+
+    const err = new RequestError(expectedMsg, expectedStatusCode);
+
+    expect(err.message).toBe(expectedMsg);
+    expect(err.statusCode).toBe(expectedStatusCode);
+});
\ No newline at end of file
diff --git a/tests/lib.test.ts b/tests/service.test.ts
similarity index 71%
rename from tests/lib.test.ts
rename to tests/service.test.ts
index 0d81aca..5a6fc8f 100644
--- a/tests/lib.test.ts
+++ b/tests/service.test.ts
@@ -19,7 +19,7 @@ afterEach(async () => {
     await srv.stop();
 });
 
-test('nats adaptor success', async () => {
+test('request success', async () => {
     const dataExpected = "hello success";
     const statusCodeExpected = 200;
 
@@ -36,7 +36,7 @@ test('nats adaptor success', async () => {
     expect(res.statusCode).toBe(statusCodeExpected);
 });
 
-test('nats adaptor error', async () => {
+test('request error', async () => {
     const dataExpected = "hello error";
     const statusCodeExpected = 500;
 
@@ -49,3 +49,16 @@ test('nats adaptor error', async () => {
     expect(srv.request(adaptorName, {service: serviceName, subject: subject, data: dataExpected})).rejects.toThrow(RequestError);
 });
 
+test('request adaptor not found', async () => {
+    const dataExpected = "hello success";
+    const statusCodeExpected = 200;
+
+    srv.addAdaptor(adaptorName, new NatsAdaptor({ servers: [natsServer] }));
+    srv.subscribe(adaptorName, subject, async (msg: Message<string>) => {
+        return {data: msg.data, statusCode: statusCodeExpected};
+    });
+
+    await srv.listen();
+    expect(srv.request("bad adaptor", {service: serviceName, subject: subject, data: dataExpected})).rejects.toThrow(Error);
+});
+