name	localappdata-test-isolation
description	Isolate tests for services that write under %LOCALAPPDATA% without touching the real user profile.
domain	testing
confidence	high
source	earned

Use this skill when a unit test exercises code that writes beneath %LOCALAPPDATA%, such as %LOCALAPPDATA%\CopilotBooster\models-cache.json.

Create a unique temp directory per test instance.
Save the original LOCALAPPDATA environment value.
Set LOCALAPPDATA before constructing the service under test.
Restore the original environment value in Dispose or finally.
Delete the temp tree during cleanup.
Production code should resolve Environment.GetEnvironmentVariable("LOCALAPPDATA") first, then fall back to Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), so tests can redirect the location deterministically.

tests\Services\CopilotModelsServiceTests.cs uses a per-test temp %LOCALAPPDATA% root and writes/reads CopilotBooster\models-cache.json there.

Do not write tests against the real user %LOCALAPPDATA% folder.
Do not assume Environment.GetFolderPath(SpecialFolder.LocalApplicationData) honors process-level LOCALAPPDATA changes on Windows.
Do not leave global environment variables modified after a test.

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name	localappdata-test-isolation
description	Isolate tests for services that write under %LOCALAPPDATA% without touching the real user profile.
domain	testing
confidence	high
source	earned

Use this skill when a unit test exercises code that writes beneath %LOCALAPPDATA%, such as %LOCALAPPDATA%\CopilotBooster\models-cache.json.

Create a unique temp directory per test instance.
Save the original LOCALAPPDATA environment value.
Set LOCALAPPDATA before constructing the service under test.
Restore the original environment value in Dispose or finally.
Delete the temp tree during cleanup.
Production code should resolve Environment.GetEnvironmentVariable("LOCALAPPDATA") first, then fall back to Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), so tests can redirect the location deterministically.

tests\Services\CopilotModelsServiceTests.cs uses a per-test temp %LOCALAPPDATA% root and writes/reads CopilotBooster\models-cache.json there.

Do not write tests against the real user %LOCALAPPDATA% folder.
Do not assume Environment.GetFolderPath(SpecialFolder.LocalApplicationData) honors process-level LOCALAPPDATA changes on Windows.
Do not leave global environment variables modified after a test.