Update all test assertions for EF Core 10 parameter naming changes

[Copilot]

EF Core 10 removed @__ prefixes and _N suffixes from SQL parameter names. This PR systematically updates all test assertions to match the new parameter naming convention.

Changes

Comprehensive Update (35 test files, 701 parameter references):

• Systematically replaced all occurrences of @__variableName_N with @variableName
• Fixed Indexof_with_emptystring: corrected SQL assertion from Region to ContactName (unrelated bug)

Key files updated:

• NorthwindFunctionsQueryMySqlTest.cs (110 changes)
• NorthwindWhereQueryMySqlTest.cs (104 changes)
• NorthwindGroupByQueryMySqlTest.cs (102 changes)
• TPCGearsOfWarQueryMySqlTest.cs (264 changes)
• DateOnlyQueryMySqlTest.cs (20 changes)
• And 30 other test files

Examples:

# NorthwindGroupByQueryMySqlTest.cs
- @__a_0='2'
+ @a='2'

# NorthwindWhereQueryMySqlTest.cs
- @__myDatetime_0='2015-04-10T00:00:00.0000000' (DbType = DateTime)
+ @myDatetime='2015-04-10T00:00:00.0000000' (DbType = DateTime)

# DateOnlyQueryMySqlTest.cs
- @__todayDateOnly_1='11/17/2025' (DbType = Date)
+ @todayDateOnly='11/17/2025' (DbType = Date)

Technical Details

EF Core 10 Parameter Naming Changes:

• Before (EF Core 9): @__variableName_0, @__variableName_1
• After (EF Core 10): @variableName
• Reasoning: Simplified naming improves SQL readability and reflects query pipeline improvements

Ref: dotnet/efcore#35113

Validation

• ✅ All 701 parameter references updated across 35 test files
• ✅ Build passes successfully
• ✅ All changes are to test assertions only - no production code changes

Fixes #120

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Assert.Equal() Failure: Strings differ</issue_title>
<issue_description>```
Error: Assert.Equal() Failure: Strings differ
↓ (pos 227)
Expected: ···"\nWHERE (LOCATE('', c.`Region`) - 1) = 0"
Actual: ···"RE (LOCATE('', `c`.`ContactName`) - 1) = "···
↑ (pos 227)
[xUnit.net 00:00:18.82] Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.DateOnlyQueryMySqlTest.DateDiffDay(isAsync: False) [FAIL]

Failed Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.NorthwindFunctionsQueryMySqlTest.Indexof_with_emptystring(async: False) [192 ms]
Error Message:
Assert.Equal() Failure: Strings differ
↓ (pos 227)
Expected: ···"\nWHERE (LOCATE('', c.Region) - 1) = 0"
Actual: ···"RE (LOCATE('', c.ContactName) - 1) = "···
↑ (pos 227)
Stack Trace:
at Microsoft.EntityFrameworkCore.TestUtilities.TestSqlLoggerFactory.AssertBaseline(String[] expected, Boolean assertOrder, Boolean forUpdate)
at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.NorthwindFunctionsQueryMySqlTest.AssertSql(String[] expected) in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/NorthwindFunctionsQueryMySqlTest.cs:line 3315
at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.NorthwindFunctionsQueryMySqlTest.Indexof_with_emptystring(Boolean async) in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/NorthwindFunctionsQueryMySqlTest.cs:line 236
--- End of stack trace from previous location ---

Error: Assert.Equal() Failure: Strings differ
↓ (pos 1)
Expected: "@__matchExpireDateTime_0='2299-12-31T00:0"···
Actual: "@matchExpireDateTime='2299-12-31T00:00:00"···
↑ (pos 1)

Failed Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.DateOnlyQueryMySqlTest.ToDateTime_with_default_TimeOnly(isAsync: False) [110 ms]
Error Message:
Assert.Equal() Failure: Strings differ
↓ (pos 1)
Expected: "@__matchExpireDateTime_0='2299-12-31T00:0"···
Actual: "@matchExpireDateTime='2299-12-31T00:00:00"···
↑ (pos 1)
Stack Trace:
at Microsoft.EntityFrameworkCore.TestUtilities.TestSqlLoggerFactory.AssertBaseline(String[] expected, Boolean assertOrder, Boolean forUpdate)
at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.DateOnlyQueryMySqlTest.AssertSql(String expected) in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/DateOnlyQueryMySqlTest.cs:line 162
at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.DateOnlyQueryMySqlTest.ToDateTime_with_default_TimeOnly(Boolean isAsync) in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/DateOnlyQueryMySqlTest.cs:line 96
--- End of stack trace from previous location ---
Passed Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.NullKeysMySqlTest.Include_with_null_fKs_and_non_nullable_PK [150 ms]
Passed Pomelo.EntityFrameworkCore.MySql.FunctionalTests.ModelBuilding.MySqlModelBuilderGenericTest+MySqlGenericOneToOne.Inverse_discovered_after_entity_unignored [161 ms]

Error: Assert.Equal() Failure: Strings differ
↓ (pos 1)
Expected: "@__todayDateOnly_1='11/17/2025' (DbType ="···
Actual: "@todayDateOnly='11/17/2025' (DbType = Dat"···
↑ (pos 1)

Failed Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.DateOnlyQueryMySqlTest.DateDiffDay(isAsync: True) [74 ms]
Error Message:
Assert.Equal() Failure: Strings differ
↓ (pos 1)
Expected: "@__todayDateOnly_1='11/17/2025' (DbType ="···
Actual: "@todayDateOnly='11/17/2025' (DbType = Dat"···
↑ (pos 1)
Stack Trace:
at Microsoft.EntityFrameworkCore.TestUtilities.TestSqlLoggerFactory.AssertBaseline(String[] expected, Boolean assertOrder, Boolean forUpdate)
at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.DateOnlyQueryMySqlTest.AssertSql(String expected) in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/DateOnlyQueryMySqlTest.cs:line 162
at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.DateOnlyQueryMySqlTest.DateDiffDay(Boolean isAsync) in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/DateOnlyQueryMySqlTest.cs:line 134
at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.DateOnlyQueryMySqlTest.DateDiffDay(Boolean isAsync) in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/DateOnlyQueryMySqlTest.cs:line 134

</details>

- Fixes microting/Pomelo.EntityFrameworkCore.MySql#120

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[renemadsen]

@copilot since we have the same kind of error, it must be safe to assume that all parameters have been changed from being without leading __ and trailing number in ef .net core 10

Error: Assert.Equal() Failure: Strings differ
            ↓ (pos 1)
Expected: "@__a_0='2'\n\nSELECT COALESCE(SUM(`o0`.`Ord"···
Actual:   "@a='2'\n\nSELECT COALESCE(SUM(`o0`.`OrderID"···
            ↑ (pos 1)

  Failed Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.NorthwindGroupByQueryMySqlTest.GroupBy_param_with_element_selector_Select_Sum3(async: False) [30 ms]
  Error Message:
   Assert.Equal() Failure: Strings differ
            ↓ (pos 1)
Expected: "@__a_0='2'\n\nSELECT COALESCE(SUM(`o0`.`Ord"···
Actual:   "@a='2'\n\nSELECT COALESCE(SUM(`o0`.`OrderID"···
            ↑ (pos 1)
  Stack Trace:
     at Microsoft.EntityFrameworkCore.TestUtilities.TestSqlLoggerFactory.AssertBaseline(String[] expected, Boolean assertOrder, Boolean forUpdate)
   at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.NorthwindGroupByQueryMySqlTest.AssertSql(String[] expected) in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/NorthwindGroupByQueryMySqlTest.cs:line 3798
   at Pomelo.EntityFrameworkCore.MySql.FunctionalTests.Query.NorthwindGroupByQueryMySqlTest.GroupBy_param_with_element_selector_Select_Sum3(Boolean async) in /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/Query/NorthwindGroupByQueryMySqlTest.cs:line 1064

[Copilot]

@copilot since we have the same kind of error, it must be safe to assume that all parameters have been changed from being without leading __ and trailing number in ef .net core 10

...

You're absolutely right! I've now updated all 690 parameter references across 34 test files systematically. The changes follow the EF Core 10 pattern of removing the @__ prefix and _N suffix from all parameter names.

The fix is in commit 5ad8288 which updates parameters like:

• @__a_0 → @a
• @__myDatetime_0 → @myDatetime
• And all similar patterns throughout the test suite