diff --git a/src/test/java/video/api/client/api/clients/CaptionsApiTest.java b/src/test/java/video/api/client/api/clients/CaptionsApiTest.java
index 5000742..3d14973 100644
--- a/src/test/java/video/api/client/api/clients/CaptionsApiTest.java
+++ b/src/test/java/video/api/client/api/clients/CaptionsApiTest.java
@@ -88,9 +88,11 @@ public void responseWithStatus200Test() throws ApiException {
 
             assertThat(res.getItems()).containsExactlyInAnyOrder(
                     new Caption().src("https://cdn.api.video/vod/vi3N6cDinStg3oBbN79GklWS/captions/en.vtt")
-                            .uri("/videos/vi3N6cDinStg3oBbN79GklWS/captions/en").srclang("en")._default(false),
+                            .uri("/videos/vi3N6cDinStg3oBbN79GklWS/captions/en").srclang("en").languageName("English")
+                            ._default(false),
                     new Caption().src("https://cdn.api.video/vod/vi3N6cDinStg3oBbN79GklWS/captions/fr.vtt")
-                            .uri("/videos/vi3N6cDinStg3oBbN79GklWS/captions/fr").srclang("fr")._default(false));
+                            .uri("/videos/vi3N6cDinStg3oBbN79GklWS/captions/fr").srclang("fr").languageName("Française")
+                            ._default(false));
         }
 
         @Test
@@ -132,6 +134,7 @@ public void responseWithStatus200Test() throws ApiException {
             assertThat(res.getUri()).isEqualTo("/videos/vi3N6cDinStg3oBbN79GklWS/captions/en");
             assertThat(res.getSrc()).isEqualTo("https://cdn.api.video/vod/vi3N6cDinStg3oBbN79GklWS/captions/en.vtt");
             assertThat(res.getSrclang()).isEqualTo("en");
+            assertThat(res.getLanguageName()).isEqualTo("English");
             assertThat(res.getDefault()).isEqualTo(false);
         }
 
@@ -180,18 +183,19 @@ public void responseWithStatus200Test() throws ApiException {
             assertThat(res.getUri()).isEqualTo("/videos/vi3N6cDinStg3oBbN79GklWS/captions/en");
             assertThat(res.getSrc()).isEqualTo("https://cdn.api.video/vod/vi3N6cDinStg3oBbN79GklWS/captions/en.vtt");
             assertThat(res.getSrclang()).isEqualTo("en");
+            assertThat(res.getLanguageName()).isEqualTo("English");
             assertThat(res.getDefault()).isEqualTo(true);
         }
 
         @Test
-        @DisplayName("400 response")
+        @DisplayName("400-0 response")
         public void responseWithStatus400Test() throws ApiException {
-            answerOnAnyRequest(400, readResourceFile(PAYLOADS_PATH + "responses/400.json"));
+            answerOnAnyRequest(400, readResourceFile(PAYLOADS_PATH + "responses/400-0.json"));
 
-            assertThatThrownBy(() -> api.update("vi4k0jvEUuaTdRAEjQ4Prklg", "en", new CaptionsUpdatePayload()))
+            assertThatThrownBy(() -> api.update("vi4k0jvEUuaTdRAEjQ4Prklg", "en_", new CaptionsUpdatePayload()))
                     .isInstanceOf(ApiException.class)
                     .satisfies(e -> assertThat(((ApiException) e).getCode()).isEqualTo(400))
-                    .hasMessage("string (required)");
+                    .hasMessage("An attribute is invalid.");
         }
 
         @Test
@@ -238,6 +242,7 @@ public void responseWithStatus200Test() throws ApiException {
             assertThat(res.getUri()).isEqualTo("/videos/vi3N6cDinStg3oBbN79GklWS/captions/en");
             assertThat(res.getSrc()).isEqualTo("https://cdn.api.video/vod/vi3N6cDinStg3oBbN79GklWS/captions/en.vtt");
             assertThat(res.getSrclang()).isEqualTo("en");
+            assertThat(res.getLanguageName()).isEqualTo("English");
             assertThat(res.getDefault()).isEqualTo(false);
         }