Consistently check errors in GraphQlTester

Closes gh-891

Author: rstoyanchev

spring-graphql-test/src/main/java/org/springframework/graphql/test/tester/DefaultGraphQlTester.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -296,6 +296,7 @@ public Path path(String path) {
 
 		@Override
 		public Path path(String path, Consumer<Path> pathConsumer) {
+			this.delegate.verifyErrors();
 			return DefaultPath.forNestedPath(null, path, this.delegate, pathConsumer);
 		}
 

spring-graphql-test/src/test/java/org/springframework/graphql/test/tester/GraphQlTesterTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -292,6 +292,21 @@ void errorsCheckedOnTraverse() {
 		assertThat(getActualRequestDocument()).contains(document);
 	}
 
+	@Test // gh-891
+	void errorsCheckedOnTraverseWithConsumer() {
+
+		String document = "{me {name, friends}}";
+		getGraphQlService().setError(document, builder -> builder.message("Invalid query"));
+
+		assertThatThrownBy(() ->
+				graphQlTester().document(document)
+						.execute()
+						.path("me", it -> it.path("name").hasValue()))
+				.hasMessageContaining("Response has 1 unexpected error(s)");
+
+		assertThat(getActualRequestDocument()).contains(document);
+	}
+
 	@Test
 	void errorsPartiallyFiltered() {