Step 77: custom code editor renderer

editor/tests/step77_test.cpp

@@ -0,0 +1,105 @@
+// Step 77 TDD Test: Custom code editor renderer
+//
+// Tests:
+// 1. Can render with an ImGui context (no crash)
+// 2. Text input inserts characters and reports change
+// 3. Cursor position updates after input
+
+#include <cassert>
+#include <iostream>
+#include "imgui.h"
+#include "CodeEditorWidget.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: Render without crashing ---
+    {
+        beginFrame();
+        ImGui::SetNextWindowFocus();
+        ImGui::Begin("TestWindow");
+        CodeEditorWidget widget;
+        std::string text;
+        std::vector<HighlightSpan> spans;
+        CodeEditorOptions opts;
+        CodeEditorResult res = widget.render("##editor", text, spans, opts, ImVec2(300, 200), ImGui::GetFont());
+        (void)res;
+        ImGui::End();
+        endFrame();
+        std::cout << "Test 1 PASS: Render without crash" << std::endl;
+        ++passed;
+    }
+
+    // --- Test 2: Text input inserts characters ---
+    {
+        beginFrame();
+        ImGui::SetNextWindowFocus();
+        ImGui::Begin("TestWindow2");
+        CodeEditorWidget widget;
+        std::string text;
+        std::vector<HighlightSpan> spans;
+        CodeEditorOptions opts;
+
+        ImGuiIO& io = ImGui::GetIO();
+        io.AddInputCharacter('a');
+        io.AddInputCharacter('b');
+        io.AddInputCharacter('\n');
+
+        CodeEditorResult res = widget.render("##editor2", text, spans, opts, ImVec2(300, 200), ImGui::GetFont());
+        ImGui::End();
+        endFrame();
+
+        assert(res.changed && "Should report changed after input");
+        assert(text == "ab\n" && "Text should match input");
+        std::cout << "Test 2 PASS: Text input inserts characters" << std::endl;
+        ++passed;
+    }
+
+    // --- Test 3: Cursor position updates ---
+    {
+        beginFrame();
+        ImGui::SetNextWindowFocus();
+        ImGui::Begin("TestWindow3");
+        CodeEditorWidget widget;
+        std::string text;
+        std::vector<HighlightSpan> spans;
+        CodeEditorOptions opts;
+
+        ImGuiIO& io = ImGui::GetIO();
+        io.AddInputCharacter('x');
+        io.AddInputCharacter('y');
+
+        CodeEditorResult res = widget.render("##editor3", text, spans, opts, ImVec2(300, 200), ImGui::GetFont());
+        ImGui::End();
+        endFrame();
+
+        assert(res.cursorByte == 2 && "Cursor should be at end of inserted text");
+        std::cout << "Test 3 PASS: Cursor updates" << std::endl;
+        ++passed;
+    }
+
+    ImGui::DestroyContext();
+
+    std::cout << "\n=== Step 77 Results: " << passed << " passed, " << failed << " failed ===" << std::endl;
+    return failed > 0 ? 1 : 0;
+}