task dac9b1e5: avoid LSP startup panic on StateDir failure

1 files changed, 15 insertions, 0 deletions

diff --git a/cmd/hexai-lsp-server/main_test.go b/cmd/hexai-lsp-server/main_test.go
index 5563e3d..9861f54 100644
--- a/cmd/hexai-lsp-server/main_test.go
+++ b/cmd/hexai-lsp-server/main_test.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"log"
 	"os"
+	"path/filepath"
 	"testing"
 )
 
@@ -20,3 +21,17 @@ func TestMain_Version(t *testing.T) {
 		t.Fatalf("expected version log")
 	}
 }
+
+func TestDefaultLogPathFallsBackToTempDirOnStateDirFailure(t *testing.T) {
+	stateHome := filepath.Join(t.TempDir(), "state-home-file")
+	if err := os.WriteFile(stateHome, []byte("not-a-directory"), 0o644); err != nil {
+		t.Fatalf("write state home marker: %v", err)
+	}
+	t.Setenv("XDG_STATE_HOME", stateHome)
+
+	got := defaultLogPath()
+	want := filepath.Join(os.TempDir(), "hexai-lsp-server.log")
+	if got != want {
+		t.Fatalf("expected temp-dir fallback %q, got %q", want, got)
+	}
+}