test(config): set USERPROFILE in folder_cache test setup for Windows

mvanhorn · mvanhorn · commit 2a0818f1cb95 · 2026-04-26T07:18:56.000-07:00
os.UserHomeDir() reads HOME on Linux/macOS but USERPROFILE on Windows. The existing t.Setenv("HOME", ...) had no effect on windows-latest, so every test resolved cacheDir() to the runner's real %USERPROFILE%, where state leaked across tests in the package and produced the failures seen on PR #1007's windows-latest job.
diff --git a/config/folder_cache_test.go b/config/folder_cache_test.go
@@ -10,11 +10,14 @@ import (
 
 // folderCacheTestSetup redirects HOME to a per-test temp directory so
 // cacheDir() resolves under the temp tree and the cache file does not
-// collide with the user's real ~/.cache/matcha state.
+// collide with the user's real ~/.cache/matcha state. USERPROFILE is set
+// for the same reason on Windows, where os.UserHomeDir() reads it instead
+// of HOME.
 func folderCacheTestSetup(t *testing.T) string {
 	t.Helper()
 	tempDir := t.TempDir()
 	t.Setenv("HOME", tempDir)
+	t.Setenv("USERPROFILE", tempDir)
 	return tempDir
 }
 
