test: fix mock initialization and dependency injection in OpenRouterServiceTest

src/test/java/ru/cathub/telegabot/service/OpenRouterServiceTest.java

@@ -1,6 +1,7 @@
 package ru.cathub.telegabot.service;
 
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.InjectMocks;
 import org.mockito.Mock;
@@ -25,12 +26,20 @@ class OpenRouterServiceTest {
 
     @Mock
     private RestTemplate restTemplate;
-
-    @InjectMocks
+    
+    @Mock
+    private OpenRouterConfig openRouterConfig;
+    
     private OpenRouterServiceImpl openRouterService;
 
-    @InjectMocks
-    private OpenRouterConfig openRouterConfig;
+    @BeforeEach
+    void setUp() {
+        when(openRouterConfig.getKey()).thenReturn("test-key");
+        when(openRouterConfig.getUrl()).thenReturn("https://test-url");
+        when(openRouterConfig.getModel()).thenReturn("test-model");
+        
+        openRouterService = new OpenRouterServiceImpl(openRouterConfig, restTemplate);
+    }
 
     @Test
     void shouldReturnValidResponse() throws OpenRouterException {