test(automation): lock serializer children/value/imgui/app_state shapes

tests/automation/test_serializer.cpp

@@ -30,3 +30,51 @@ TEST_CASE("node_to_json emits the unified node shape", "[automation][serializer]
     // No value set -> no "value" key.
     CHECK_FALSE(j.contains("value"));
 }
+
+TEST_CASE("node_to_json includes children only for wx when requested",
+          "[automation][serializer]") {
+    UiNode parent;
+    parent.backend = BackendKind::Wx;
+    parent.klass   = "Panel";
+    UiNode child;
+    child.backend = BackendKind::Wx;
+    child.klass   = "Button";
+    child.label   = "OK";
+    parent.children.push_back(child);
+
+    const auto with    = node_to_json(parent, true);
+    const auto without = node_to_json(parent, false);
+
+    REQUIRE(with.contains("children"));
+    CHECK(with.at("children").size() == 1);
+    CHECK(with.at("children")[0].at("label") == "OK");
+    CHECK_FALSE(without.contains("children"));
+}
+
+TEST_CASE("node_to_json emits value and imgui backend tag",
+          "[automation][serializer]") {
+    UiNode n;
+    n.backend   = BackendKind::ImGui;
+    n.klass     = "combo";
+    n.has_value = true;
+    n.value     = "PLA";
+    const auto j = node_to_json(n, /*include_children*/ true);
+    CHECK(j.at("backend") == "imgui");
+    CHECK(j.at("value") == "PLA");
+    CHECK_FALSE(j.contains("children")); // imgui items are flat
+}
+
+TEST_CASE("app_state_to_json shape", "[automation][serializer]") {
+    AppState s;
+    s.active_tab     = "preview";
+    s.project_loaded = true;
+    s.slicing        = true;
+    s.slice_progress = 42;
+    s.foreground     = true;
+    s.modal_dialog   = std::string("Save changes?");
+    const auto j = app_state_to_json(s);
+    CHECK(j.at("active_tab") == "preview");
+    CHECK(j.at("project_loaded") == true);
+    CHECK(j.at("slice_progress") == 42);
+    CHECK(j.at("modal_dialog") == "Save changes?");
+}