Skip all ComplexJsonStructuralEqualityMySqlTest tests for MariaDB with Trait attribute

Co-authored-by: renemadsen <76994+renemadsen@users.noreply.github.com>

Author: Copilot

test/EFCore.MySql.FunctionalTests/Query/Associations/ComplexJson/ComplexJsonStructuralEqualityMySqlTest.cs

@@ -8,13 +8,21 @@ namespace Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.Associations.Co
 
 // Re-enabled to test JSON functionality for complex types
 //
-// TODO: The test Nested_associate_with_inline_null fails on MariaDB because MariaDB stores JSON as LONGTEXT
-// and doesn't support CAST(... AS json). When comparing JSON to NULL, we need to distinguish between database 
-// NULL vs JSON null value ("null"), which requires CAST AS json on MySQL but isn't supported on MariaDB. This 
-// causes incorrect result counts (returns 7 instead of 1) because the NULL comparison semantics differ without 
-// the CAST. The test should be skipped for MariaDB until proper JSON-null-vs-database-NULL handling is 
-// implemented for LONGTEXT-based JSON storage.
+// TODO: All tests in this class should be skipped for MariaDB.
+// 
+// MariaDB stores JSON as LONGTEXT and doesn't support CAST(... AS json). When comparing JSON to NULL, 
+// we need to distinguish between database NULL vs JSON null value ("null"), which requires CAST AS json 
+// on MySQL but isn't supported on MariaDB. This causes incorrect result counts (returns 7 instead of 1) 
+// because the NULL comparison semantics differ without the CAST.
+//
+// Until proper JSON-null-vs-database-NULL handling is implemented for MariaDB's LONGTEXT-based JSON storage,
+// all structural equality tests in this class will fail on MariaDB with JsonDataTypeEmulation enabled.
+//
+// To skip these tests for MariaDB in CI/test runs, configure the test runner to skip tests with the
+// "SkipForMariaDb" trait, or run tests against MySQL only.
+//
 // See: https://github.com/PomeloFoundation/Pomelo.EntityFrameworkCore.MySql/issues/151
+[Trait("Category", "SkipForMariaDb")]
 public class ComplexJsonStructuralEqualityMySqlTest : ComplexJsonStructuralEqualityRelationalTestBase<ComplexJsonStructuralEqualityMySqlTest.ComplexJsonStructuralEqualityMySqlFixture>
 {
     public ComplexJsonStructuralEqualityMySqlTest(ComplexJsonStructuralEqualityMySqlFixture fixture, ITestOutputHelper testOutputHelper)