test: write tests for global exception handler #2

Author: nevio18324

backend/src/test/java/ch/puzzle/pcts/GlobalExceptionHandlerIT.java

@@ -0,0 +1,62 @@
+package ch.puzzle.pcts;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import ch.puzzle.pcts.dto.error.GenericErrorDto;
+import ch.puzzle.pcts.exception.PCTSException;
+import ch.puzzle.pcts.model.error.ErrorKey;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.validation.BindException;
+
+class GlobalExceptionHandlerIT {
+
+    private final GlobalExceptionHandler handler = new GlobalExceptionHandler();
+
+    @DisplayName("Should return internal server error")
+    @Test
+    void shouldReturnInternalServerErrorResponse() {
+        Exception ex = new Exception("Test exception");
+
+        ResponseEntity<GenericErrorDto> response = handler.handleGenericException(ex);
+
+        assertThat(response.getStatusCode().value()).isEqualTo(500);
+
+        GenericErrorDto body = response.getBody();
+        assertThat(body).isNotNull();
+        assertThat(body.key()).isEqualTo(ErrorKey.INTERNAL);
+        assertThat(body.reasons()).containsExactly("Something has gone wrong on the server, please check the logs");
+    }
+
+    @DisplayName("Should handle bind exception")
+    @Test
+    void shouldHandleBindException() {
+        BindException ex = new BindException("Test exception", "Test bind exception");
+
+        ResponseEntity<GenericErrorDto> response = handler.handle(ex);
+
+        assertThat(response.getStatusCode().value()).isEqualTo(400);
+
+        GenericErrorDto body = response.getBody();
+        assertThat(body).isNotNull();
+        assertThat(body.key()).isEqualTo(ErrorKey.VALIDATION);
+        assertThat(body.reasons()).containsExactly();
+    }
+
+    @DisplayName("Should return pcts exception")
+    @Test
+    void shouldReturnPctsException() {
+        PCTSException ex = new PCTSException(HttpStatus.BAD_REQUEST, "Test Pcts exception", ErrorKey.ID_IS_NOT_NULL);
+
+        ResponseEntity<GenericErrorDto> response = handler.handlePCTSException(ex);
+
+        assertThat(response.getStatusCode().value()).isEqualTo(400);
+
+        GenericErrorDto body = response.getBody();
+        assertThat(body).isNotNull();
+        assertThat(body.key()).isEqualTo(ErrorKey.ID_IS_NOT_NULL);
+        assertThat(body.reasons()).containsExactly("Test Pcts exception");
+    }
+}