Step 81: code folding

editor/tests/step81_test.cpp

@@ -0,0 +1,88 @@
+// Step 81 TDD Test: Code folding
+//
+// Tests:
+// 1. Fold regions detected for Python function
+// 2. Toggle fold updates fold state
+
+#include <cassert>
+#include <iostream>
+#include "imgui.h"
+#include "CodeEditorWidget.h"
+#include "EditorMode.h"
+
+static void beginFrame() {
+    ImGuiIO& io = ImGui::GetIO();
+    io.DisplaySize = ImVec2(800, 600);
+    io.DeltaTime = 1.0f / 60.0f;
+    ImGui::NewFrame();
+}
+
+static void endFrame() {
+    ImGui::Render();
+}
+
+int main() {
+    int passed = 0;
+    int failed = 0;
+
+    IMGUI_CHECKVERSION();
+    ImGui::CreateContext();
+    ImGui::StyleColorsDark();
+    ImGuiIO& io = ImGui::GetIO();
+    io.Fonts->AddFontDefault();
+    io.Fonts->Build();
+
+    // --- Test 1: Fold region detection ---
+    {
+        beginFrame();
+        ImGui::SetNextWindowFocus();
+        ImGui::Begin("TestWindow");
+        CodeEditorWidget widget;
+        EditorMode mode("python");
+        std::string text = "def f():\n    x = 1\n    y = 2\n";
+        std::vector<HighlightSpan> spans;
+        CodeEditorOptions opts;
+        opts.mode = &mode;
+        opts.enableFolding = true;
+
+        CodeEditorResult res = widget.render("##editor", text, spans, opts, ImVec2(300, 200), ImGui::GetFont());
+        (void)res;
+        ImGui::End();
+        endFrame();
+
+        const auto& folds = widget.getFoldRegions();
+        assert(!folds.empty() && "Should detect fold region");
+        std::cout << "Test 1 PASS: Fold region detected" << std::endl;
+        ++passed;
+    }
+
+    // --- Test 2: Toggle fold ---
+    {
+        beginFrame();
+        ImGui::SetNextWindowFocus();
+        ImGui::Begin("TestWindow2");
+        CodeEditorWidget widget;
+        EditorMode mode("python");
+        std::string text = "def f():\n    x = 1\n    y = 2\n";
+        std::vector<HighlightSpan> spans;
+        CodeEditorOptions opts;
+        opts.mode = &mode;
+        opts.enableFolding = true;
+
+        widget.render("##editor2", text, spans, opts, ImVec2(300, 200), ImGui::GetFont());
+        widget.toggleFoldAtLine(0);
+        ImGui::End();
+        endFrame();
+
+        const auto& folds = widget.getFoldRegions();
+        assert(!folds.empty());
+        assert(folds[0].folded && "Fold should be toggled on");
+        std::cout << "Test 2 PASS: Fold toggled" << std::endl;
+        ++passed;
+    }
+
+    ImGui::DestroyContext();
+
+    std::cout << "\n=== Step 81 Results: " << passed << " passed, " << failed << " failed ===" << std::endl;
+    return failed > 0 ? 1 : 0;
+}