1 files changed, 59 insertions, 0 deletions
diff --git a/gui/internal/model/prefs_test.go b/gui/internal/model/prefs_test.go
new file mode 100644
index 0000000..6c01dee
--- /dev/null
+++ b/gui/internal/model/prefs_test.go
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package model
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+// sandboxHome points HOME and every XDG_* at a temporary directory, as the
+// other tests here do.
+func sandboxHome(t *testing.T) string {
+	t.Helper()
+	h := t.TempDir()
+	t.Setenv("HOME", h)
+	for _, v := range []string{"XDG_CONFIG_HOME", "XDG_STATE_HOME", "XDG_DATA_HOME", "XDG_CACHE_HOME"} {
+		t.Setenv(v, "")
+	}
+	return h
+}
+
+// TestPrefsRoundTrip: what is saved comes back, and the file lands beside
+// krino.conf.
+func TestPrefsRoundTrip(t *testing.T) {
+	h := sandboxHome(t)
+	p := DefaultPrefs()
+	p.FontSize = 13
+	p.Colours = false
+	p.SelectAll = false
+	if err := p.Save(); err != nil {
+		t.Fatal(err)
+	}
+	if got := LoadPrefs(); got != p {
+		t.Errorf("loaded %+v, want %+v", got, p)
+	}
+	want := filepath.Join(h, ".config", "krino", "gui.json")
+	if _, err := os.Stat(want); err != nil {
+		t.Errorf("not written to %s: %v", want, err)
+	}
+}
+
+// TestPrefsWithoutAFile: the first run has no file, and damaged text is not
+// worth refusing to open a window over.
+func TestPrefsWithoutAFile(t *testing.T) {
+	sandboxHome(t)
+	if got := LoadPrefs(); got != DefaultPrefs() {
+		t.Errorf("with no file: %+v, want the defaults", got)
+	}
+	if err := os.MkdirAll(filepath.Dir(PrefsFile()), 0o755); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(PrefsFile(), []byte("{not json"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	if got := LoadPrefs(); got != DefaultPrefs() {
+		t.Errorf("with damaged text: %+v, want the defaults", got)
+	}
+}