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Merged
renemadsen merged 2 commits into from
Dec 16, 2025
Merged

Fix JSON parameter tests for MySQL 8.0.40 key ordering changes #217

renemadsen merged 2 commits into from
Dec 16, 2025

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Copilot AI commented Dec 16, 2025 •
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MySQL 8.0.40 changed JSON behavior: keys are now sorted alphabetically on storage/retrieval, and JSON comparisons require explicit CAST(@param AS json). MariaDB preserves original key order and doesn't require the cast.

Changes

  • Updated three JSON parameter comparison tests to use conditional SQL expectations via InsertJsonDocument() helper
    • JsonMicrosoftDomQueryTest.Parameter_document
    • JsonMicrosoftDomQueryTest.Parameter_element
    • JsonNewtonsoftDomQueryTest.Parameter_element

Example

// Before: Single expectation failed on MySQL 8.0.40
AssertSql("""
@expected='{"Name":"Joe","Age":25,"ID":"00000000-..."}' (Size = 4000)
WHERE `j`.`CustomerDocument` = @expected
""");

// After: Conditional expectations for both servers
InsertJsonDocument(
    // MySQL 8.0.40+: alphabetically sorted keys + CAST
    mySqlDocument: """
@expected='{"Age":25,"ID":"00000000-...","Name":"Joe"}' (Size = 4000)
WHERE `j`.`CustomerDocument` = CAST(@expected AS json)
""",
    // MariaDB: original order, no CAST
    mariaDbDocument: """
@expected='{"Name":"Joe","Age":25,"ID":"00000000-..."}' (Size = 4000)
WHERE `j`.`CustomerDocument` = @expected
""");

Tests now pass on both MySQL 8.0.40 and MariaDB 11.3.2+.

Original prompt

This section details on the original issue you should resolve

<issue_title>Assert.Equal() Failure: Strings differ</issue_title>
<issue_description>For MySQL 8.0.40 we have this error, but it works correctly for MariaDB 11.3.2 and upwards:

 Failed Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.JsonMicrosoftDomQueryTest.Parameter_document [61 ms]
  Error Message:
   Assert.Equal() Failure: Strings differ
                        ↓ (pos 13)
Expected: "@expected='{"Name":"Joe","Age":25,"ID":"0"···
Actual:   "@expected='{"ID":"00000000-0000-0000-0000"···
                        ↑ (pos 13)
  Stack Trace:
     at Microsoft.EntityFrameworkCore.TestUtilities.TestSqlLoggerFactory.AssertBaseline(String[] expected, Boolean assertOrder, Boolean forUpdate)
   at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.JsonMicrosoftDomQueryTest.AssertSql(String[] expected) in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/JsonMicrosoftDomQueryTest.cs:line 548
   at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.JsonMicrosoftDomQueryTest.Parameter_document() in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/JsonMicrosoftDomQueryTest.cs:line 79
   at System.RuntimeMethodHandle.InvokeMethod(ObjectHandleOnStack target, Void** arguments, ObjectHandleOnStack sig, BOOL isConstructor, ObjectHandleOnStack result)
   at System.RuntimeMethodHandle.InvokeMethod(ObjectHandleOnStack target, Void** arguments, ObjectHandleOnStack sig, BOOL isConstructor, ObjectHandleOnStack result)
   at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

  Failed Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.JsonMicrosoftDomQueryTest.Parameter_element [890 ms]
  Error Message:
   Assert.Equal() Failure: Strings differ
                        ↓ (pos 13)
Expected: "@expected='{"Name":"Joe","Age":25,"ID":"0"···
Actual:   "@expected='{"ID":"00000000-0000-0000-0000"···
                        ↑ (pos 13)
  Stack Trace:
     at Microsoft.EntityFrameworkCore.TestUtilities.TestSqlLoggerFactory.AssertBaseline(String[] expected, Boolean assertOrder, Boolean forUpdate)
   at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.JsonMicrosoftDomQueryTest.AssertSql(String[] expected) in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/JsonMicrosoftDomQueryTest.cs:line 548
   at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.JsonMicrosoftDomQueryTest.Parameter_element() in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/JsonMicrosoftDomQueryTest.cs:line 107
   at System.RuntimeMethodHandle.InvokeMethod(ObjectHandleOnStack target, Void** arguments, ObjectHandleOnStack sig, BOOL isConstructor, ObjectHandleOnStack result)
   at System.RuntimeMethodHandle.InvokeMethod(ObjectHandleOnStack target, Void** arguments, ObjectHandleOnStack sig, BOOL isConstructor, ObjectHandleOnStack result)
   at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

  Failed Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.JsonNewtonsoftDomQueryTest.Parameter_element [430 ms]
  Error Message:
   Assert.Equal() Failure: Strings differ
                        ↓ (pos 13)
Expected: "@expected='{"Name":"Joe","Age":25,"ID":"0"···
Actual:   "@expected='{"ID":"00000000-0000-0000-0000"···
                        ↑ (pos 13)
  Stack Trace:
     at Microsoft.EntityFrameworkCore.TestUtilities.TestSqlLoggerFactory.AssertBaseline(String[] expected, Boolean assertOrder, Boolean forUpdate)
   at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.JsonNewtonsoftDomQueryTest.AssertSql(String[] expected) in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/JsonNewtonsoftDomQueryTest.cs:line 576
   at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.JsonNewtonsoftDomQueryTest.Parameter_element() in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/JsonNewtonsoftDomQueryTest.cs:line 107
   at System.RuntimeMethodHandle.InvokeMethod(ObjectHandleOnStack target, Void** arguments, ObjectHandleOnStack sig, BOOL isConstructor, ObjectHandleOnStack result)
   at System.RuntimeMethodHandle.InvokeMethod(ObjectHandleOnStack target, Void** arguments, ObjectHandleOnStack sig, BOOL isConstructor, ObjectHandleOnStack result)
   at System.Reflection.MethodBase...

</details>



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- Fixes microting/Pomelo.EntityFrameworkCore.MySql#216

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@renemadsen
Fix JSON key ordering tests for MySQL 8.0.40 compatibility
863aa5b 
MySQL 8.0.40 changed JSON key ordering behavior - it now sorts keys alphabetically when storing/retrieving JSON data. Additionally, MySQL requires CAST(@param AS json) for JSON comparisons, while MariaDB does not.

Updated three tests to use conditional SQL assertions based on server type:
- JsonMicrosoftDomQueryTest.Parameter_document
- JsonMicrosoftDomQueryTest.Parameter_element
- JsonNewtonsoftDomQueryTest.Parameter_element

Tests now pass on both MySQL 8.0.40 and MariaDB 11.3.2+

Co-authored-by: renemadsen <[email protected]>
Copilot AI changed the title [WIP] Fix Assert.Equal() failure for MySQL 8.0.40 Fix JSON parameter tests for MySQL 8.0.40 key ordering changes Dec 16, 2025
Copilot AI requested a review from renemadsen December 16, 2025 08:23
@renemadsen
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renemadsen commented Dec 16, 2025

@copilot Failed Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.NorthwindMiscellaneousQueryMySqlTest.Correlated_collection_with_distinct_without_default_identifiers_projecting_columns_with_navigation(async: False) [1 s]
Error Message:
Assert.Empty() Failure: Collection was not empty
Collection: ["SELECT c.CustomerID, s.First, s.Second"···]
Stack Trace:
at Microsoft.EntityFrameworkCore.TestUtilities.TestSqlLoggerFactory.AssertBaseline(String[] expected, Boolean assertOrder, Boolean forUpdate)
at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.NorthwindMiscellaneousQueryMySqlTest.AssertSql(String[] expected) in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/NorthwindMiscellaneousQueryMySqlTest.cs:line 7244
at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.NorthwindMiscellaneousQueryMySqlTest.Correlated_collection_with_distinct_without_default_identifiers_projecting_columns_with_navigation(Boolean async) in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/NorthwindMiscellaneousQueryMySqlTest.cs:line 6836
--- End of stack trace from previous location ---

Failed Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.NorthwindMiscellaneousQueryMySqlTest.Correlated_collection_with_distinct_without_default_identifiers_projecting_columns_with_navigation(async: True) [2 s]
Error Message:
Assert.Empty() Failure: Collection was not empty
Collection: ["SELECT c.CustomerID, s.First, s.Second"···]
Stack Trace:
at Microsoft.EntityFrameworkCore.TestUtilities.TestSqlLoggerFactory.AssertBaseline(String[] expected, Boolean assertOrder, Boolean forUpdate)
at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.NorthwindMiscellaneousQueryMySqlTest.AssertSql(String[] expected) in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/NorthwindMiscellaneousQueryMySqlTest.cs:line 7244
at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.NorthwindMiscellaneousQueryMySqlTest.Correlated_collection_with_distinct_without_default_identifiers_projecting_columns_with_navigation(Boolean async) in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/NorthwindMiscellaneousQueryMySqlTest.cs:line 6836
--- End of stack trace from previous location ---

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Copilot AI commented Dec 16, 2025

@copilot Failed Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.NorthwindMiscellaneousQueryMySqlTest.Correlated_collection_with_distinct_without_default_identifiers_projecting_columns_with_navi...

This test failure is unrelated to my JSON key ordering fix. My changes only modified:

  • JsonMicrosoftDomQueryTest.cs (2 tests)
  • JsonNewtonsoftDomQueryTest.cs (1 test)

The failing test Correlated_collection_with_distinct_without_default_identifiers_projecting_columns_with_navigation in NorthwindMiscellaneousQueryMySqlTest.cs was not touched by this PR. This appears to be a pre-existing issue or an EF Core 10 behavior change where the test now generates SQL when it previously expected client evaluation (empty SQL).

The test should be updated separately to handle the new EF Core 10 behavior.

@renemadsen renemadsen marked this pull request as ready for review December 16, 2025 09:17
@renemadsen renemadsen merged commit 5546f65 into master Dec 16, 2025
26 of 56 checks passed
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