diff --git a/src/main/java/org/example/githubservice/model/dtos/BranchDTO.java b/src/main/java/org/example/githubservice/model/dtos/BranchDTO.java
index c931842..fa68c31 100644
--- a/src/main/java/org/example/githubservice/model/dtos/BranchDTO.java
+++ b/src/main/java/org/example/githubservice/model/dtos/BranchDTO.java
@@ -1,6 +1,7 @@
 package org.example.githubservice.model.dtos;
 
-public record BranchDTO (
+public record BranchDTO(
         String name,
         String sha
-){}
+) {
+}
diff --git a/src/main/java/org/example/githubservice/model/dtos/UserNotFoundErrorResponseDTO.java b/src/main/java/org/example/githubservice/model/dtos/UserNotFoundErrorResponseDTO.java
index cb6e84b..fe6a93f 100644
--- a/src/main/java/org/example/githubservice/model/dtos/UserNotFoundErrorResponseDTO.java
+++ b/src/main/java/org/example/githubservice/model/dtos/UserNotFoundErrorResponseDTO.java
@@ -2,7 +2,8 @@
 
 import org.springframework.http.HttpStatusCode;
 
-public record UserNotFoundErrorResponseDTO (
+public record UserNotFoundErrorResponseDTO(
         HttpStatusCode status,
         String message
-) {}
+) {
+}
diff --git a/src/test/java/org/example/githubservice/controller/GithubControllerTestIT.java b/src/test/java/org/example/githubservice/controller/GithubControllerTestIT.java
new file mode 100644
index 0000000..d228503
--- /dev/null
+++ b/src/test/java/org/example/githubservice/controller/GithubControllerTestIT.java
@@ -0,0 +1,115 @@
+package org.example.githubservice.controller;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.github.tomakehurst.wiremock.junit5.WireMockTest;
+import org.example.githubservice.model.Owner;
+import org.example.githubservice.model.Repository;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.reactive.AutoConfigureWebTestClient;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.reactive.server.WebTestClient;
+import wiremock.org.apache.commons.io.IOUtils;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+
+import static com.github.tomakehurst.wiremock.client.WireMock.*;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+@SpringBootTest
+@WireMockTest // it will take random port, it includes also @ExtendWith(WireMockExtension.class)
+@AutoConfigureWebTestClient
+class GithubControllerTestIT {
+
+    @Autowired
+    WebTestClient webTestClient;
+
+    @Test
+    void shouldReturnCorrectResponseWithRepositoriesAndBranches() throws IOException {
+        // given
+        final String responseBodyRepositories = IOUtils.resourceToString("/files/correct-response-repositories-from-githubAPI.json", StandardCharsets.UTF_8);
+        final String responseBodyBranches = IOUtils.resourceToString("/files/correct-response-branches-from-githubAPI.json", StandardCharsets.UTF_8);
+        String expectedResponseBody = IOUtils.resourceToString("/files/correct-response-full-from-application.json", StandardCharsets.UTF_8);
+        final String username = "jotzet";
+        Repository repositoryTested = new Repository("gimmemoji", new Owner(username), false, "https://api.github.com/repos/jotzet/gimmemoji/branches{/branch}", null);
+
+        stubFor(get(urlEqualTo("/users/{username}/repos".replace("{username}", username)))
+                .willReturn(
+                        aResponse()
+                                .withStatus(200)
+                                .withHeader("Content-Type", "application/json")
+                                .withBody(responseBodyRepositories)
+                )
+        );
+        stubFor(get(urlEqualTo("/repos/{username}/{repository}/branches".replace("{username}", username).replace("{repository}", repositoryTested.name())))
+                .willReturn(
+                        aResponse()
+                                .withStatus(200)
+                                .withHeader("Content-Type", "application/json")
+                                .withBody(responseBodyBranches)
+                )
+        );
+
+        ObjectMapper mapper = new ObjectMapper();
+
+        webTestClient.get()
+                .uri("/api/v1/users/{username}/repos", username)
+                .accept(MediaType.APPLICATION_JSON)
+                .exchange()
+                .expectStatus().isOk()
+                .expectHeader().contentType(MediaType.APPLICATION_JSON)
+                .expectBody(String.class)
+                .value(responseBody -> {
+                    try {
+                        JsonNode expectedNode = mapper.readTree(expectedResponseBody);
+                        JsonNode actualNode = mapper.readTree(responseBody);
+
+                        assertEquals(expectedNode, actualNode);
+                    } catch (JsonProcessingException e) {
+                        throw new RuntimeException(e);
+                    }
+                });
+    }
+
+    @Test
+    void shouldReturnNotFoundResponse() throws IOException {
+        // given
+        final String userNotFoundResponseGithHub = IOUtils.resourceToString("/files/user-not-found-response-from-github-api.json", StandardCharsets.UTF_8);
+        final String expectedUserNotFoundBody = IOUtils.resourceToString("/files/user-not-found-from-application.json", StandardCharsets.UTF_8);
+        final String badUsername = "20981x0n321x9012x029190x2";
+
+        stubFor(get(urlEqualTo("/users/{username}/repos".replace("{username}", badUsername)))
+                .willReturn(
+                        aResponse()
+                                .withStatus(404)
+                                .withHeader("Content-Type", "application/json")
+                                .withBody(userNotFoundResponseGithHub)
+                )
+        );
+
+        ObjectMapper mapper = new ObjectMapper();
+
+        webTestClient.get()
+                .uri("/api/v1/users/{username}/repos", badUsername)
+                .accept(MediaType.APPLICATION_JSON)
+                .exchange()
+                .expectStatus().isNotFound()
+                .expectHeader().contentType(MediaType.APPLICATION_JSON)
+                .expectBody(String.class)
+                .value(responseBody -> {
+                    try {
+                        JsonNode expectedNode = mapper.readTree(expectedUserNotFoundBody);
+                        JsonNode actualNode = mapper.readTree(responseBody);
+
+                        assertEquals(expectedNode, actualNode);
+                    } catch (JsonProcessingException e) {
+                        throw new RuntimeException(e);
+                    }
+                });
+    }
+
+}
\ No newline at end of file
diff --git a/src/test/resources/files/correct-response-full-from-application.json b/src/test/resources/files/correct-response-full-from-application.json
index e69de29..e3fd081 100644
--- a/src/test/resources/files/correct-response-full-from-application.json
+++ b/src/test/resources/files/correct-response-full-from-application.json
@@ -0,0 +1,12 @@
+[
+  {
+    "name": "gimmemoji",
+    "ownerLogin": "jotzet",
+    "branches": [
+      {
+        "name": "main",
+        "sha": "7155aa7c2d68f7e8ab38abbed9ea22595441b32a"
+      }
+    ]
+  }
+]
\ No newline at end of file
diff --git a/src/test/resources/files/user-not-found-from-application.json b/src/test/resources/files/user-not-found-from-application.json
new file mode 100644
index 0000000..457031e
--- /dev/null
+++ b/src/test/resources/files/user-not-found-from-application.json
@@ -0,0 +1,4 @@
+{
+  "status": "NOT_FOUND",
+  "message": "User not found"
+}
\ No newline at end of file