Fix race condition in MigrationTests with xUnit Collection

[Copilot]

Four MigrationTests intermittently failed on Windows CI with IOException: The process cannot access the file 'MigrationTest.sqlite' because it is being used by another process.

All test methods in MigrationTests share a single RegressionTestHelper instance that recreates the same SQLite file. When xUnit runs these tests in parallel, multiple threads attempt to delete/recreate the same file simultaneously.

Changes

• Add [Collection("MigrationTests")] attribute to serialize test execution within this class

[Collection("MigrationTests")]
public class MigrationTests : IAsyncLifetime
{
    private readonly RegressionTestHelper _helper = new("MigrationTest");
    // ...
}

Pattern already used elsewhere in the codebase for shared-resource tests (e.g., BulkCreateEntriesTests, ProjectServiceTest).

Original prompt

Fix these tests that just failed (https://github.com/sillsdev/languageforge-lexbox/actions/runs/21713352794/job/62622431811):

I'm fairly certain that no recent change broke them. I think it must just be a race condition.

[xUnit.net 00:00:55.44] LcmCrdt.Tests.Data.MigrationTests.VerifyAfterMigrationFromScriptedDb(regressionVersion: v2) [FAIL]
[xUnit.net 00:00:55.44] LcmCrdt.Tests.Data.MigrationTests.VerifyAfterMigrationFromScriptedDb(regressionVersion: v1) [FAIL]
[xUnit.net 00:00:55.44] LcmCrdt.Tests.Data.MigrationTests.GetEntries_WorksAfterMigrationFromScriptedDb(regressionVersion: v1) [FAIL]
[xUnit.net 00:00:55.44] LcmCrdt.Tests.Data.MigrationTests.GetEntries_WorksAfterMigrationFromScriptedDb(regressionVersion: v2) [FAIL]

Error: System.IO.IOException : The process cannot access the file 'D:\a\languageforge-lexbox\languageforge-lexbox\backend\FwLite\LcmCrdt.Tests\bin\Debug\net9.0\MigrationTest.sqlite' because it is being used by another process.

Failed LcmCrdt.Tests.Data.MigrationTests.VerifyAfterMigrationFromScriptedDb(regressionVersion: v2) [5 ms]
Error Message:
System.IO.IOException : The process cannot access the file 'D:\a\languageforge-lexbox\languageforge-lexbox\backend\FwLite\LcmCrdt.Tests\bin\Debug\net9.0\MigrationTest.sqlite' because it is being used by another process.
Stack Trace:
at System.IO.FileSystem.DeleteFile(String fullPath)
at LcmCrdt.Tests.Data.RegressionTestHelper.InitDbFromScripts(RegressionVersion version) in D:\a\languageforge-lexbox\languageforge-lexbox\backend\FwLite\LcmCrdt.Tests\Data\RegressionTestHelper.cs:line 19
at LcmCrdt.Tests.Data.RegressionTestHelper.InitializeAsync(RegressionVersion version) in D:\a\languageforge-lexbox\languageforge-lexbox\backend\FwLite\LcmCrdt.Tests\Data\RegressionTestHelper.cs:line 52
at LcmCrdt.Tests.Data.MigrationTests.VerifyAfterMigrationFromScriptedDb(RegressionVersion regressionVersion) in D:\a\languageforge-lexbox\languageforge-lexbox\backend\FwLite\LcmCrdt.Tests\Data\MigrationTests.cs:line 58
--- End of stack trace from previous location ---

Error: System.IO.IOException : The process cannot access the file 'D:\a\languageforge-lexbox\languageforge-lexbox\backend\FwLite\LcmCrdt.Tests\bin\Debug\net9.0\MigrationTest.sqlite' because it is being used by another process.

Failed LcmCrdt.Tests.Data.MigrationTests.VerifyAfterMigrationFromScriptedDb(regressionVersion: v1) [1 ms]
Error Message:
System.IO.IOException : The process cannot access the file 'D:\a\languageforge-lexbox\languageforge-lexbox\backend\FwLite\LcmCrdt.Tests\bin\Debug\net9.0\MigrationTest.sqlite' because it is being used by another process.
Stack Trace:
at System.IO.FileSystem.DeleteFile(String fullPath)
at LcmCrdt.Tests.Data.RegressionTestHelper.InitDbFromScripts(RegressionVersion version) in D:\a\languageforge-lexbox\languageforge-lexbox\backend\FwLite\LcmCrdt.Tests\Data\RegressionTestHelper.cs:line 19
at LcmCrdt.Tests.Data.RegressionTestHelper.InitializeAsync(RegressionVersion version) in D:\a\languageforge-lexbox\languageforge-lexbox\backend\FwLite\LcmCrdt.Tests\Data\RegressionTestHelper.cs:line 52
at LcmCrdt.Tests.Data.MigrationTests.VerifyAfterMigrationFromScriptedDb(RegressionVersion regressionVersion) in D:\a\languageforge-lexbox\languageforge-lexbox\backend\FwLite\LcmCrdt.Tests\Data\MigrationTests.cs:line 58
--- End of stack trace from previous location ---

Error: System.IO.IOException : The process cannot access the file 'D:\a\languageforge-lexbox\languageforge-lexbox\backend\FwLite\LcmCrdt.Tests\bin\Debug\net9.0\MigrationTest.sqlite' because it is being used by another process.

Failed LcmCrdt.Tests.Data.MigrationTests.GetEntries_WorksAfterMigrationFromScriptedDb(regressionVersion: v1) [2 ms]
Error Message:
System.IO.IOException : The process cannot access the file 'D:\a\languageforge-lexbox\languageforge-lexbox\backend\FwLite\LcmCrdt.Tests\bin\Debug\net9.0\MigrationTest.sqlite' because it is being used by another process.
Stack Trace:
at System.IO.FileSystem.DeleteFile(String fullPath)
at LcmCrdt.Tests.Data.RegressionTestHelper.InitDbFromScripts(RegressionVersion version) in D:\a\languageforge-lexbox\languageforge-lexbox\backend\FwLite\LcmCrdt.Tests\Data\RegressionTestHelper.cs:line 19
at LcmCrdt.Tests.Data.RegressionTestHelper.InitializeAsync(RegressionVersion version) in D:\a\languageforge-lexbox\languageforge-lexbox\backend\FwLite\LcmCrdt.Tests\Data\RegressionTestHelper.cs:line 52
at LcmCrdt.Tests.Data.MigrationTests.GetEntries_WorksAfterMigrationFromScriptedDb(RegressionVersion regressionVersion) in D:\a\languageforge-lexbox\languageforge-lexbox\backend\FwLite\LcmCrdt.Tests\Data\MigrationTests.cs:line 41
--- End of stack trace from previous location ---

Error: System.IO.IOException : The process cannot access the file 'D:\a\languageforge-lexbox\languageforge-lexbox\backend\FwLite\LcmCrdt.Tests\bin\Debug\net9.0\MigrationTest.sqlite' because it is being used by another process....

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[github-actions]

UI unit Tests

  1 files  ±0   50 suites  ±0   23s ⏱️ -1s
138 tests ±0  138 ✅ ±0  0 💤 ±0  0 ❌ ±0 
203 runs  ±0  203 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit c06a08d. ± Comparison against base commit f37f947.

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No changes detected	-	Feb 5, 2026, 2:12 PM