Add request logging

src/test/java/com/imgfloat/app/config/TwitchOAuth2ErrorResponseErrorHandlerTest.java

@@ -0,0 +1,58 @@
+package com.imgfloat.app.config;
+
+import java.net.URI;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.RequestEntity;
+import org.springframework.http.ResponseEntity;
+import org.springframework.mock.http.client.MockClientHttpResponse;
+import org.springframework.security.oauth2.core.OAuth2AuthorizationException;
+import org.springframework.security.oauth2.core.endpoint.OAuth2AccessTokenResponse;
+import org.springframework.test.web.client.MockRestServiceServer;
+import org.springframework.web.client.RestTemplate;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.springframework.test.web.client.match.MockRestRequestMatchers.requestTo;
+import static org.springframework.test.web.client.response.MockRestResponseCreators.withSuccess;
+
+class TwitchOAuth2ErrorResponseErrorHandlerTest {
+
+    private final TwitchOAuth2ErrorResponseErrorHandler handler = new TwitchOAuth2ErrorResponseErrorHandler();
+
+    @Test
+    void fallsBackToSyntheticErrorWhenErrorBodyIsMissing() throws Exception {
+        MockClientHttpResponse response = new MockClientHttpResponse(new byte[0], HttpStatus.BAD_REQUEST);
+        response.getHeaders().setContentType(MediaType.APPLICATION_JSON);
+
+        OAuth2AuthorizationException exception = assertThrows(OAuth2AuthorizationException.class,
+                () -> handler.handleError(response));
+
+        assertThat(exception.getError().getErrorCode()).isEqualTo("invalid_token_response");
+        assertThat(exception.getError().getDescription())
+                .contains("Failed to parse Twitch OAuth error response");
+    }
+
+    @Test
+    void successfulResponsesStillParseNormally() {
+        RestTemplate restTemplate = OAuth2RestTemplateFactory.create();
+        restTemplate.setErrorHandler(new TwitchOAuth2ErrorResponseErrorHandler());
+        MockRestServiceServer server = MockRestServiceServer.bindTo(restTemplate).build();
+
+        server.expect(requestTo("https://id.twitch.tv/oauth2/token"))
+                .andRespond(withSuccess(
+                        "{\"access_token\":\"abc\",\"token_type\":\"bearer\",\"expires_in\":3600,\"scope\":[]}",
+                        MediaType.APPLICATION_JSON));
+
+        RequestEntity<Void> request = RequestEntity.post(URI.create("https://id.twitch.tv/oauth2/token")).build();
+        ResponseEntity<OAuth2AccessTokenResponse> response = restTemplate.exchange(request, OAuth2AccessTokenResponse.class);
+
+        assertThat(response.getStatusCode()).isEqualTo(HttpStatus.OK);
+        assertThat(response.getBody()).isNotNull();
+        assertThat(response.getBody().getAccessToken().getTokenValue()).isEqualTo("abc");
+
+        server.verify();
+    }
+}