refactor: stabilize runtime and unify config

pkg/tools/arg_helpers_object_test.go

@@ -0,0 +1,23 @@
+package tools
+
+import "testing"
+
+func TestMapObjectArgReturnsEmptyMapForMissingValue(t *testing.T) {
+	t.Parallel()
+
+	got := MapObjectArg(nil, "arguments")
+	if got == nil || len(got) != 0 {
+		t.Fatalf("expected empty map, got %#v", got)
+	}
+}
+
+func TestMapObjectArgReturnsObjectValue(t *testing.T) {
+	t.Parallel()
+
+	got := MapObjectArg(map[string]interface{}{
+		"arguments": map[string]interface{}{"path": "README.md"},
+	}, "arguments")
+	if got["path"] != "README.md" {
+		t.Fatalf("unexpected object arg: %#v", got)
+	}
+}