[enh] add confg handling tests

Author: asciimoo

config/config_test.go

@@ -0,0 +1,59 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestLoadConfigCopiesDefaultKeys(t *testing.T) {
+	tests := []struct {
+		name       string
+		contents   string
+		customCtrl string
+	}{
+		{
+			name: "no key configuration",
+		},
+		{
+			name:       "omitted key category",
+			contents:   "[keys.global]\nCtrlR = \"customSubmit\"\n",
+			customCtrl: "customSubmit",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			original := DefaultKeys["url"]["Enter"]
+			t.Cleanup(func() {
+				DefaultKeys["url"]["Enter"] = original
+			})
+
+			configFile := filepath.Join(t.TempDir(), "config.toml")
+			if err := os.WriteFile(configFile, []byte(test.contents), 0600); err != nil {
+				t.Fatal(err)
+			}
+
+			loaded, err := LoadConfig(configFile)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if test.customCtrl != "" && loaded.Keys["global"]["CtrlR"] != test.customCtrl {
+				t.Fatalf("custom CtrlR binding = %q, want %q", loaded.Keys["global"]["CtrlR"], test.customCtrl)
+			}
+
+			loaded.Keys["url"]["Enter"] = "changed"
+			if DefaultKeys["url"]["Enter"] != original {
+				t.Fatalf("DefaultKeys changed to %q after loaded config mutation", DefaultKeys["url"]["Enter"])
+			}
+
+			reloaded, err := LoadConfig(configFile)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if reloaded.Keys["url"]["Enter"] != original {
+				t.Fatalf("subsequent load inherited %q, want %q", reloaded.Keys["url"]["Enter"], original)
+			}
+		})
+	}
+}