Make report format tests more reliable

This commit ensures that report format tests don't break when the ordering of reported missing fields change.

Author: bclozel

spring-graphql/src/test/java/org/springframework/graphql/execution/SchemaMappingInspectorTests.java

@@ -534,11 +534,11 @@ void reportUnmappedField() {
 """;
  SchemaReport report = inspectSchema(schema, BookController.class);
 assertThatReport(report).hasUnmappedFieldCount(1).hasSkippedTypeCount(0);
- assertThat(report.toString()).isEqualTo("""
-GraphQL schema inspection:
-Unmapped fields: {Book=[missing]}
-Unmapped registrations: {Book.fetcher=BookController#fetcher[1 args], Query.paginatedBooks=BookController#paginatedBooks[0 args], Query.bookObject=BookController#bookObject[1 args], Query.bookById=BookController#bookById[1 args]}
-Skipped types: []""");
+ assertThat(report.toString())
+ .contains("GraphQL schema inspection:", "Unmapped fields: {Book=[missing]}", "Unmapped registrations:",
+ "{Book.fetcher=BookController#fetcher[1 args]", " Query.paginatedBooks=BookController#paginatedBooks[0 args]",
+ "Query.bookObject=BookController#bookObject[1 args]", "Query.bookById=BookController#bookById[1 args]",
+ "Skipped types: []");
  }
 
 }