[JAVA-14660] Update code for Graphql error handling (#12839)

spring-boot-modules/spring-boot-graphql/src/test/java/com/baeldung/graphql/error/handling/GraphQLErrorHandlerIntegrationTest.java

@@ -0,0 +1,90 @@
+package com.baeldung.graphql.error.handling;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.graphql.test.tester.HttpGraphQlTester;
+import org.springframework.test.context.ActiveProfiles;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+import static graphql.ErrorType.NullValueInNonNullableField;
+import static org.springframework.graphql.execution.ErrorType.INTERNAL_ERROR;
+import static org.springframework.graphql.execution.ErrorType.NOT_FOUND;
+
+@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT, classes = GraphQLErrorHandlerApplication.class)
+@ActiveProfiles("error-handling")
+public class GraphQLErrorHandlerIntegrationTest {
+
+    private static final String GRAPHQL_TEST_REQUEST_PATH = "src/test/resources/graphql-files/request/%s_request.graphql";
+    private static final String GRAPHQL_TEST_RESPONSE_PATH = "src/test/resources/graphql-files/response/%s_response.json";
+
+    @Autowired
+    private HttpGraphQlTester graphQlTester;
+
+    @Test
+    void whenMandatoryFieldNull_thenRespondWithResponseError() throws IOException {
+        String nonNullFieldScenario = "non_null_field";
+
+        graphQlTester.document(fileToRequest(nonNullFieldScenario))
+          .execute()
+          .errors()
+          .expect(error -> error.getErrorType() == NullValueInNonNullableField)
+          .verify()
+          .path("$.data")
+          .matchesJson(fileToResponse(nonNullFieldScenario));
+    }
+
+    @Test
+    void whenUnhandledException_thenRespondWithGenericError() throws IOException {
+        String unhandledExceptionScenario = "unhandled_exception";
+
+        graphQlTester.document(fileToRequest(unhandledExceptionScenario))
+          .execute()
+          .errors()
+          .expect(error -> error.getErrorType() == INTERNAL_ERROR)
+          .verify()
+          .path("$.data")
+          .valueIsNull();
+    }
+
+    @Test
+    void whenHandledException_thenRespondWithCustomErrorDetails() throws IOException {
+        String handledExceptionScenario = "handled_exception";
+
+        graphQlTester.document(fileToRequest(handledExceptionScenario))
+          .execute()
+          .errors()
+          .expect(error -> error.getErrorType() == NOT_FOUND
+            && "Vehicle with vin: 123 not found.".equals(error.getMessage()))
+          .verify()
+          .path("$.data")
+          .matchesJson("{\n"
+            + "        \"searchByVin\": null\n"
+            + "    }");
+    }
+
+    @Test
+    void whenNoException_thenRespondWithNoError() throws IOException {
+        String noExceptionScenario = "no_exception";
+
+        graphQlTester.document(fileToRequest(noExceptionScenario))
+          .execute()
+          .path("$.data")
+          .matchesJson(fileToResponse(noExceptionScenario));
+    }
+
+    private static String fileToRequest(String fileName) throws IOException {
+        Path path = Paths.get(String.format(GRAPHQL_TEST_REQUEST_PATH, fileName));
+        return new String(Files.readAllBytes(path));
+    }
+
+    private static String fileToResponse(String fileName) throws IOException {
+        Path path = Paths.get(String.format(GRAPHQL_TEST_RESPONSE_PATH, fileName));
+        return new String(Files.readAllBytes(path));
+    }
+}

spring-boot-modules/spring-boot-graphql/src/test/java/com/baeldung/graphql/intro/PostControllerIntegrationTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.graphql;
+package com.baeldung.graphql.intro;
 
 import lombok.SneakyThrows;
 import org.junit.jupiter.api.Test;

spring-boot-modules/spring-boot-graphql/src/test/java/com/baeldung/graphql/intro/SpringContextTest.java

@@ -1,5 +1,6 @@
-package com.baeldung.graphql;
+package com.baeldung.graphql.intro;
 
+import com.baeldung.graphql.intro.GraphqlApplication;
 import org.junit.jupiter.api.Test;
 import org.springframework.boot.test.context.SpringBootTest;
 

spring-boot-modules/spring-boot-graphql/src/test/resources/graphql-files/request/handled_exception_request.graphql

@@ -0,0 +1,10 @@
+query {
+    searchByVin(vin: "123"){
+        vin
+        year
+        make
+        model
+        trim
+    }
+}
+

spring-boot-modules/spring-boot-graphql/src/test/resources/graphql-files/request/no_exception_request.graphql

@@ -0,0 +1,8 @@
+query {
+    searchByVin(vin: "KM8JN72DX7U587496"){
+        vin
+        year
+        make
+        model
+    }
+}

spring-boot-modules/spring-boot-graphql/src/test/resources/graphql-files/request/non_null_field_request.graphql

@@ -0,0 +1,10 @@
+query {
+    searchAll {
+        vin
+        year
+        make
+        model
+        trim
+    }
+}
+

spring-boot-modules/spring-boot-graphql/src/test/resources/graphql-files/request/unhandled_exception_request.graphql

@@ -0,0 +1,10 @@
+query {
+    searchByLocation(zipcode: "123"){
+        vin
+        year
+        make
+        model
+        trim
+    }
+}
+

spring-boot-modules/spring-boot-graphql/src/test/resources/graphql-files/response/no_exception_response.json

@@ -0,0 +1,8 @@
+{
+  "searchByVin": {
+    "vin": "KM8JN72DX7U587496",
+    "year": 2007,
+    "make": "Hyundai",
+    "model": "Tucson"
+  }
+}

spring-boot-modules/spring-boot-graphql/src/test/resources/graphql-files/response/non_null_field_response.json

@@ -0,0 +1,19 @@
+{
+  "searchAll": [
+    null,
+    {
+      "vin": "JTKKU4B41C1023346",
+      "year": 2012,
+      "make": "Toyota",
+      "model": "Scion",
+      "trim": "Xd"
+    },
+    {
+      "vin": "1G1JC1444PZ215071",
+      "year": 2000,
+      "make": "Chevrolet",
+      "model": "CAVALIER VL",
+      "trim": "RS"
+    }
+  ]
+}