XCEngine/tests/NewEditor/test_xcui_demo_runtime.cpp

#include <gtest/gtest.h>

#include "XCUIBackend/XCUIDemoRuntime.h"

#include <XCEngine/Input/InputTypes.h>
#include <XCEngine/UI/Types.h>

#include <chrono>
#include <filesystem>
#include <fstream>
#include <sstream>
#include <string>
#include <vector>

namespace {

namespace fs = std::filesystem;

using XCEngine::UI::UIDrawCommand;
using XCEngine::UI::UIDrawCommandType;
using XCEngine::UI::UIInputEvent;
using XCEngine::UI::UIInputEventType;

XCEngine::Editor::XCUIBackend::XCUIDemoInputState BuildInputState(
    float width = 720.0f,
    float height = 420.0f) {
    XCEngine::Editor::XCUIBackend::XCUIDemoInputState input = {};
    input.canvasRect = XCEngine::UI::UIRect(0.0f, 0.0f, width, height);
    input.pointerPosition = XCEngine::UI::UIPoint(width * 0.5f, height * 0.5f);
    input.pointerInside = true;
    return input;
}

UIInputEvent MakeCharacterEvent(std::uint32_t character) {
    UIInputEvent event = {};
    event.type = UIInputEventType::Character;
    event.character = character;
    return event;
}

UIInputEvent MakeKeyDownEvent(
    XCEngine::Input::KeyCode keyCode,
    bool repeat = false,
    bool shift = false,
    bool control = false,
    bool alt = false,
    bool super = false) {
    UIInputEvent event = {};
    event.type = UIInputEventType::KeyDown;
    event.keyCode = static_cast<std::int32_t>(keyCode);
    event.repeat = repeat;
    event.modifiers.shift = shift;
    event.modifiers.control = control;
    event.modifiers.alt = alt;
    event.modifiers.super = super;
    return event;
}

fs::path FindDemoResourcePath() {
    fs::path probe = fs::current_path();
    for (int i = 0; i < 8; ++i) {
        const fs::path canonicalCandidate = probe / "Assets/XCUI/NewEditor/Demo/View.xcui";
        if (fs::exists(canonicalCandidate)) {
            return canonicalCandidate;
        }

        const fs::path legacyCandidate = probe / "new_editor/resources/xcui_demo_view.xcui";
        if (fs::exists(legacyCandidate)) {
            return legacyCandidate;
        }

        if (!probe.has_parent_path()) {
            break;
        }
        probe = probe.parent_path();
    }

    return {};
}

std::vector<const UIDrawCommand*> CollectTextCommands(const XCEngine::UI::UIDrawData& drawData) {
    std::vector<const UIDrawCommand*> textCommands = {};
    for (const XCEngine::UI::UIDrawList& drawList : drawData.GetDrawLists()) {
        for (const UIDrawCommand& command : drawList.GetCommands()) {
            if (command.type == UIDrawCommandType::Text) {
                textCommands.push_back(&command);
            }
        }
    }
    return textCommands;
}

const UIDrawCommand* FindTextCommand(
    const XCEngine::UI::UIDrawData& drawData,
    const std::string& text) {
    for (const XCEngine::UI::UIDrawList& drawList : drawData.GetDrawLists()) {
        for (const UIDrawCommand& command : drawList.GetCommands()) {
            if (command.type == UIDrawCommandType::Text && command.text == text) {
                return &command;
            }
        }
    }
    return nullptr;
}

class FileTimestampRestoreScope {
public:
    explicit FileTimestampRestoreScope(fs::path path)
        : m_path(std::move(path)) {
        if (!m_path.empty() && fs::exists(m_path)) {
            m_originalWriteTime = fs::last_write_time(m_path);
            std::ifstream input(m_path, std::ios::binary);
            std::ostringstream stream;
            stream << input.rdbuf();
            m_originalContents = stream.str();
            m_valid = true;
        }
    }

    ~FileTimestampRestoreScope() {
        if (m_valid) {
            std::ofstream output(m_path, std::ios::binary | std::ios::trunc);
            output << m_originalContents;
            output.close();
            fs::last_write_time(m_path, m_originalWriteTime);
        }
    }

private:
    fs::path m_path;
    fs::file_time_type m_originalWriteTime = {};
    std::string m_originalContents = {};
    bool m_valid = false;
};

} // namespace

TEST(NewEditorXCUIDemoRuntimeTest, UpdateProvidesDeterministicFrameContainer) {
    XCEngine::Editor::XCUIBackend::XCUIDemoRuntime runtime;
    const bool reloadSucceeded = runtime.ReloadDocuments();

    const auto& firstFrame = runtime.Update(BuildInputState());
    EXPECT_EQ(firstFrame.stats.documentsReady, reloadSucceeded);
    EXPECT_EQ(firstFrame.stats.drawListCount, firstFrame.drawData.GetDrawListCount());
    EXPECT_EQ(firstFrame.stats.commandCount, firstFrame.drawData.GetTotalCommandCount());

    const auto& secondFrame = runtime.Update(BuildInputState());
    EXPECT_GE(secondFrame.stats.treeGeneration, firstFrame.stats.treeGeneration);
    EXPECT_EQ(secondFrame.stats.drawListCount, secondFrame.drawData.GetDrawListCount());
    EXPECT_EQ(secondFrame.stats.commandCount, secondFrame.drawData.GetTotalCommandCount());

    if (secondFrame.stats.documentsReady) {
        EXPECT_GT(secondFrame.stats.elementCount, 0u);
        EXPECT_GT(secondFrame.stats.drawListCount, 0u);
        EXPECT_GT(secondFrame.stats.commandCount, 0u);
    } else {
        EXPECT_FALSE(secondFrame.stats.statusMessage.empty());
    }
}

TEST(NewEditorXCUIDemoRuntimeTest, RuntimeFrameEmitsTextCommandsWithResolvedFontSizes) {
    XCEngine::Editor::XCUIBackend::XCUIDemoRuntime runtime;
    ASSERT_TRUE(runtime.ReloadDocuments());

    const auto& frame = runtime.Update(BuildInputState());
    ASSERT_TRUE(frame.stats.documentsReady);

    const std::vector<const UIDrawCommand*> textCommands = CollectTextCommands(frame.drawData);
    ASSERT_FALSE(textCommands.empty());

    for (const UIDrawCommand* command : textCommands) {
        ASSERT_NE(command, nullptr);
        EXPECT_FALSE(command->text.empty());
        EXPECT_GT(command->fontSize, 0.0f);
    }

    const UIDrawCommand* titleCommand = FindTextCommand(frame.drawData, "New XCUI Shell");
    ASSERT_NE(titleCommand, nullptr);
    EXPECT_FLOAT_EQ(titleCommand->fontSize, 18.0f);

    const UIDrawCommand* metricValueCommand = FindTextCommand(frame.drawData, "Driven by runtime");
    ASSERT_NE(metricValueCommand, nullptr);
    EXPECT_FLOAT_EQ(metricValueCommand->fontSize, 18.0f);

    const UIDrawCommand* buttonLabelCommand = FindTextCommand(frame.drawData, "Toggle Accent");
    ASSERT_NE(buttonLabelCommand, nullptr);
    EXPECT_FLOAT_EQ(buttonLabelCommand->fontSize, 14.0f);

    EXPECT_NE(
        FindTextCommand(frame.drawData, "Single-line input, Enter submits, 0 chars"),
        nullptr);
    EXPECT_NE(
        FindTextCommand(frame.drawData, "Multiline input, click caret, Tab indent, 1 lines"),
        nullptr);
}

TEST(NewEditorXCUIDemoRuntimeTest, InputStateTransitionsAreAcceptedAndFrameStillBuilds) {
    XCEngine::Editor::XCUIBackend::XCUIDemoRuntime runtime;
    runtime.ReloadDocuments();

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState frameInput = BuildInputState();
    frameInput.pointerPressed = true;
    frameInput.pointerDown = true;
    const auto& pressedFrame = runtime.Update(frameInput);

    frameInput.pointerPressed = false;
    frameInput.pointerReleased = true;
    frameInput.pointerDown = false;
    frameInput.shortcutPressed = true;
    const auto& releasedFrame = runtime.Update(frameInput);

    EXPECT_GE(releasedFrame.stats.treeGeneration, pressedFrame.stats.treeGeneration);
    EXPECT_EQ(releasedFrame.stats.drawListCount, releasedFrame.drawData.GetDrawListCount());
    EXPECT_EQ(releasedFrame.stats.commandCount, releasedFrame.drawData.GetTotalCommandCount());

    if (releasedFrame.stats.documentsReady) {
        EXPECT_GT(releasedFrame.stats.elementCount, 0u);
        EXPECT_GE(releasedFrame.stats.dirtyRootCount, 0u);
    }
}

TEST(NewEditorXCUIDemoRuntimeTest, DrainPendingCommandIdsReturnsEmptyForFramesWithoutCommands) {
    XCEngine::Editor::XCUIBackend::XCUIDemoRuntime runtime;
    ASSERT_TRUE(runtime.ReloadDocuments());

    const auto& frame = runtime.Update(BuildInputState());
    ASSERT_TRUE(frame.stats.documentsReady);

    const std::vector<std::string> drainedCommandIds = runtime.DrainPendingCommandIds();
    EXPECT_TRUE(drainedCommandIds.empty());
    EXPECT_TRUE(runtime.DrainPendingCommandIds().empty());
}

TEST(NewEditorXCUIDemoRuntimeTest, DrainPendingCommandIdsCapturesPointerActivationCommands) {
    XCEngine::Editor::XCUIBackend::XCUIDemoRuntime runtime;
    ASSERT_TRUE(runtime.ReloadDocuments());

    const auto& baselineFrame = runtime.Update(BuildInputState());
    ASSERT_TRUE(baselineFrame.stats.documentsReady);
    EXPECT_TRUE(runtime.DrainPendingCommandIds().empty());

    XCEngine::UI::UIRect buttonRect = {};
    ASSERT_TRUE(runtime.TryGetElementRect("toggleAccent", buttonRect));

    const XCEngine::UI::UIPoint buttonCenter(
        buttonRect.x + buttonRect.width * 0.5f,
        buttonRect.y + buttonRect.height * 0.5f);

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState pressedInput = BuildInputState();
    pressedInput.pointerPosition = buttonCenter;
    pressedInput.pointerPressed = true;
    pressedInput.pointerDown = true;
    runtime.Update(pressedInput);
    EXPECT_TRUE(runtime.DrainPendingCommandIds().empty());

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState releasedInput = BuildInputState();
    releasedInput.pointerPosition = buttonCenter;
    releasedInput.pointerReleased = true;
    const auto& toggledFrame = runtime.Update(releasedInput);

    ASSERT_TRUE(toggledFrame.stats.documentsReady);
    EXPECT_EQ(runtime.DrainPendingCommandIds(), std::vector<std::string>({ "demo.toggleAccent" }));
    EXPECT_TRUE(runtime.DrainPendingCommandIds().empty());
}

TEST(NewEditorXCUIDemoRuntimeTest, DrainPendingCommandIdsPreservesMultipleTextEditCommandsPerFrame) {
    XCEngine::Editor::XCUIBackend::XCUIDemoRuntime runtime;
    ASSERT_TRUE(runtime.ReloadDocuments());

    const auto& baselineFrame = runtime.Update(BuildInputState());
    ASSERT_TRUE(baselineFrame.stats.documentsReady);
    EXPECT_TRUE(runtime.DrainPendingCommandIds().empty());

    XCEngine::UI::UIRect promptRect = {};
    ASSERT_TRUE(runtime.TryGetElementRect("agentPrompt", promptRect));

    const XCEngine::UI::UIPoint promptCenter(
        promptRect.x + promptRect.width * 0.5f,
        promptRect.y + promptRect.height * 0.5f);

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState pressedInput = BuildInputState();
    pressedInput.pointerPosition = promptCenter;
    pressedInput.pointerPressed = true;
    pressedInput.pointerDown = true;
    runtime.Update(pressedInput);
    EXPECT_TRUE(runtime.DrainPendingCommandIds().empty());

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState releasedInput = BuildInputState();
    releasedInput.pointerPosition = promptCenter;
    releasedInput.pointerReleased = true;
    const auto& focusedFrame = runtime.Update(releasedInput);

    ASSERT_TRUE(focusedFrame.stats.documentsReady);
    EXPECT_EQ(focusedFrame.stats.focusedElementId, "agentPrompt");
    EXPECT_EQ(
        runtime.DrainPendingCommandIds(),
        std::vector<std::string>({ "demo.activate.agentPrompt" }));

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState textInput = BuildInputState();
    textInput.events.push_back(MakeCharacterEvent('A'));
    textInput.events.push_back(MakeCharacterEvent('I'));
    textInput.events.push_back(MakeKeyDownEvent(XCEngine::Input::KeyCode::Backspace));
    const auto& typedFrame = runtime.Update(textInput);

    ASSERT_TRUE(typedFrame.stats.documentsReady);
    EXPECT_EQ(typedFrame.stats.focusedElementId, "agentPrompt");
    EXPECT_EQ(
        runtime.DrainPendingCommandIds(),
        std::vector<std::string>({
            "demo.text.edit.agentPrompt",
            "demo.text.edit.agentPrompt",
            "demo.text.edit.agentPrompt" }));
    EXPECT_TRUE(runtime.DrainPendingCommandIds().empty());
}

TEST(NewEditorXCUIDemoRuntimeTest, PointerToggleUpdatesFocusStatusTextAndAccentState) {
    XCEngine::Editor::XCUIBackend::XCUIDemoRuntime runtime;
    ASSERT_TRUE(runtime.ReloadDocuments());

    const auto& baselineFrame = runtime.Update(BuildInputState());
    ASSERT_TRUE(baselineFrame.stats.documentsReady);
    EXPECT_FALSE(baselineFrame.stats.accentEnabled);
    EXPECT_NE(
        FindTextCommand(baselineFrame.drawData, "Markup -> Layout -> Style -> DrawData"),
        nullptr);

    XCEngine::UI::UIRect buttonRect = {};
    ASSERT_TRUE(runtime.TryGetElementRect("toggleAccent", buttonRect));

    const XCEngine::UI::UIPoint buttonCenter(
        buttonRect.x + buttonRect.width * 0.5f,
        buttonRect.y + buttonRect.height * 0.5f);

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState pressedInput = BuildInputState();
    pressedInput.pointerPosition = buttonCenter;
    pressedInput.pointerPressed = true;
    pressedInput.pointerDown = true;
    const auto& pressedFrame = runtime.Update(pressedInput);
    ASSERT_TRUE(pressedFrame.stats.documentsReady);

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState releasedInput = BuildInputState();
    releasedInput.pointerPosition = buttonCenter;
    releasedInput.pointerReleased = true;
    const auto& toggledFrame = runtime.Update(releasedInput);

    ASSERT_TRUE(toggledFrame.stats.documentsReady);
    EXPECT_TRUE(toggledFrame.stats.accentEnabled);
    EXPECT_EQ(toggledFrame.stats.lastCommandId, "demo.toggleAccent");
    EXPECT_EQ(toggledFrame.stats.focusedElementId, "toggleAccent");

    const UIDrawCommand* focusStatusCommand = FindTextCommand(
        toggledFrame.drawData,
        "Focus: toggleAccent");
    ASSERT_NE(focusStatusCommand, nullptr);
    EXPECT_FLOAT_EQ(focusStatusCommand->fontSize, 14.0f);
}

TEST(NewEditorXCUIDemoRuntimeTest, UpdateAutoReloadsWhenSourceTimestampChanges) {
    const fs::path viewPath = FindDemoResourcePath();
    ASSERT_FALSE(viewPath.empty());
    ASSERT_TRUE(fs::exists(viewPath));

    FileTimestampRestoreScope restoreScope(viewPath);

    XCEngine::Editor::XCUIBackend::XCUIDemoRuntime runtime;
    ASSERT_TRUE(runtime.ReloadDocuments());

    const auto& baselineFrame = runtime.Update(BuildInputState());
    ASSERT_TRUE(baselineFrame.stats.documentsReady);
    XCEngine::UI::UIRect probeRect = {};
    EXPECT_FALSE(runtime.TryGetElementRect("autoReloadProbe", probeRect));

    std::ifstream input(viewPath, std::ios::binary);
    std::ostringstream stream;
    stream << input.rdbuf();
    const std::string originalContents = stream.str();
    input.close();

    const std::string marker = "</Column>\n</View>";
    const std::size_t insertPosition = originalContents.rfind(marker);
    ASSERT_NE(insertPosition, std::string::npos);

    const std::string injectedNode =
        "    <Text id=\"autoReloadProbe\" text=\"Auto Reload Probe\" style=\"Meta\" />\n";
    std::string modifiedContents = originalContents;
    modifiedContents.insert(insertPosition, injectedNode);

    std::ofstream output(viewPath, std::ios::binary | std::ios::trunc);
    output << modifiedContents;
    output.close();

    const fs::file_time_type originalWriteTime = fs::last_write_time(viewPath);
    fs::last_write_time(viewPath, originalWriteTime + std::chrono::seconds(2));

    const auto& reloadedFrame = runtime.Update(BuildInputState());
    EXPECT_TRUE(reloadedFrame.stats.documentsReady);
    EXPECT_GT(reloadedFrame.stats.elementCount, 0u);
    EXPECT_GT(reloadedFrame.stats.commandCount, 0u);
    EXPECT_TRUE(runtime.TryGetElementRect("autoReloadProbe", probeRect));
}

TEST(NewEditorXCUIDemoRuntimeTest, TextFieldAcceptsUtf8CharactersAndBackspace) {
    XCEngine::Editor::XCUIBackend::XCUIDemoRuntime runtime;
    ASSERT_TRUE(runtime.ReloadDocuments());

    const auto& baselineFrame = runtime.Update(BuildInputState());
    ASSERT_TRUE(baselineFrame.stats.documentsReady);

    XCEngine::UI::UIRect promptRect = {};
    ASSERT_TRUE(runtime.TryGetElementRect("agentPrompt", promptRect));

    const XCEngine::UI::UIPoint promptCenter(
        promptRect.x + promptRect.width * 0.5f,
        promptRect.y + promptRect.height * 0.5f);

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState pressedInput = BuildInputState();
    pressedInput.pointerPosition = promptCenter;
    pressedInput.pointerPressed = true;
    pressedInput.pointerDown = true;
    runtime.Update(pressedInput);

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState releasedInput = BuildInputState();
    releasedInput.pointerPosition = promptCenter;
    releasedInput.pointerReleased = true;
    const auto& focusedFrame = runtime.Update(releasedInput);
    ASSERT_TRUE(focusedFrame.stats.documentsReady);
    EXPECT_EQ(focusedFrame.stats.focusedElementId, "agentPrompt");

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState textInput = BuildInputState();
    textInput.events.push_back(MakeCharacterEvent('A'));
    textInput.events.push_back(MakeCharacterEvent('I'));
    textInput.events.push_back(MakeCharacterEvent(0x4F60u));
    const auto& typedFrame = runtime.Update(textInput);

    ASSERT_TRUE(typedFrame.stats.documentsReady);
    EXPECT_EQ(typedFrame.stats.focusedElementId, "agentPrompt");
    EXPECT_NE(FindTextCommand(typedFrame.drawData, "AI你"), nullptr);
    EXPECT_EQ(typedFrame.stats.lastCommandId, "demo.text.edit.agentPrompt");

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState backspaceInput = BuildInputState();
    backspaceInput.events.push_back(MakeKeyDownEvent(XCEngine::Input::KeyCode::Backspace));
    const auto& backspacedFrame = runtime.Update(backspaceInput);

    ASSERT_TRUE(backspacedFrame.stats.documentsReady);
    EXPECT_NE(FindTextCommand(backspacedFrame.drawData, "AI"), nullptr);
    EXPECT_EQ(backspacedFrame.stats.focusedElementId, "agentPrompt");
}

TEST(NewEditorXCUIDemoRuntimeTest, TextAreaAcceptsMultilineInputAndCaretMovement) {
    XCEngine::Editor::XCUIBackend::XCUIDemoRuntime runtime;
    ASSERT_TRUE(runtime.ReloadDocuments());

    const auto& baselineFrame = runtime.Update(BuildInputState());
    ASSERT_TRUE(baselineFrame.stats.documentsReady);

    XCEngine::UI::UIRect notesRect = {};
    ASSERT_TRUE(runtime.TryGetElementRect("sessionNotes", notesRect));

    const XCEngine::UI::UIPoint notesCenter(
        notesRect.x + notesRect.width * 0.5f,
        notesRect.y + notesRect.height * 0.5f);

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState pressedInput = BuildInputState();
    pressedInput.pointerPosition = notesCenter;
    pressedInput.pointerPressed = true;
    pressedInput.pointerDown = true;
    runtime.Update(pressedInput);

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState releasedInput = BuildInputState();
    releasedInput.pointerPosition = notesCenter;
    releasedInput.pointerReleased = true;
    const auto& focusedFrame = runtime.Update(releasedInput);
    ASSERT_TRUE(focusedFrame.stats.documentsReady);
    EXPECT_EQ(focusedFrame.stats.focusedElementId, "sessionNotes");

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState textInput = BuildInputState();
    textInput.events.push_back(MakeCharacterEvent('O'));
    textInput.events.push_back(MakeCharacterEvent('K'));
    textInput.events.push_back(MakeKeyDownEvent(XCEngine::Input::KeyCode::Enter));
    textInput.events.push_back(MakeCharacterEvent('X'));
    const auto& typedFrame = runtime.Update(textInput);

    ASSERT_TRUE(typedFrame.stats.documentsReady);
    EXPECT_EQ(typedFrame.stats.focusedElementId, "sessionNotes");
    EXPECT_EQ(typedFrame.stats.lastCommandId, "demo.text.edit.sessionNotes");
    EXPECT_NE(FindTextCommand(typedFrame.drawData, "1"), nullptr);
    EXPECT_NE(FindTextCommand(typedFrame.drawData, "2"), nullptr);
    EXPECT_NE(FindTextCommand(typedFrame.drawData, "OK"), nullptr);
    EXPECT_NE(FindTextCommand(typedFrame.drawData, "X"), nullptr);
    EXPECT_NE(
        FindTextCommand(typedFrame.drawData, "Multiline input, click caret, Tab indent, 2 lines"),
        nullptr);

    const UIDrawCommand* secondLineText = FindTextCommand(typedFrame.drawData, "X");
    ASSERT_NE(secondLineText, nullptr);

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState secondLinePressed = BuildInputState();
    secondLinePressed.pointerPosition = XCEngine::UI::UIPoint(
        secondLineText->position.x + 1.0f,
        secondLineText->position.y + secondLineText->fontSize * 0.5f);
    secondLinePressed.pointerPressed = true;
    secondLinePressed.pointerDown = true;
    runtime.Update(secondLinePressed);

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState secondLineReleased = BuildInputState();
    secondLineReleased.pointerPosition = secondLinePressed.pointerPosition;
    secondLineReleased.pointerReleased = true;
    const auto& secondLineCaretFrame = runtime.Update(secondLineReleased);

    ASSERT_TRUE(secondLineCaretFrame.stats.documentsReady);
    EXPECT_EQ(secondLineCaretFrame.stats.focusedElementId, "sessionNotes");

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState tabInput = BuildInputState();
    tabInput.events.push_back(MakeKeyDownEvent(XCEngine::Input::KeyCode::Tab));
    const auto& indentedFrame = runtime.Update(tabInput);

    ASSERT_TRUE(indentedFrame.stats.documentsReady);
    EXPECT_EQ(indentedFrame.stats.focusedElementId, "sessionNotes");
    EXPECT_EQ(indentedFrame.stats.lastCommandId, "demo.text.edit.sessionNotes");
    EXPECT_NE(FindTextCommand(indentedFrame.drawData, "OK"), nullptr);
    EXPECT_NE(FindTextCommand(indentedFrame.drawData, "    X"), nullptr);

    const UIDrawCommand* firstLineText = FindTextCommand(indentedFrame.drawData, "OK");
    ASSERT_NE(firstLineText, nullptr);

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState firstLinePressed = BuildInputState();
    firstLinePressed.pointerPosition = XCEngine::UI::UIPoint(
        firstLineText->position.x + 1.0f,
        firstLineText->position.y + firstLineText->fontSize * 0.5f);
    firstLinePressed.pointerPressed = true;
    firstLinePressed.pointerDown = true;
    runtime.Update(firstLinePressed);

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState firstLineReleased = BuildInputState();
    firstLineReleased.pointerPosition = firstLinePressed.pointerPosition;
    firstLineReleased.pointerReleased = true;
    const auto& caretFrame = runtime.Update(firstLineReleased);

    ASSERT_TRUE(caretFrame.stats.documentsReady);
    EXPECT_EQ(caretFrame.stats.focusedElementId, "sessionNotes");

    XCEngine::Editor::XCUIBackend::XCUIDemoInputState editInput = BuildInputState();
    editInput.events.push_back(MakeCharacterEvent('!'));
    const auto& editedFrame = runtime.Update(editInput);

    ASSERT_TRUE(editedFrame.stats.documentsReady);
    EXPECT_NE(FindTextCommand(editedFrame.drawData, "!OK"), nullptr);
    EXPECT_NE(FindTextCommand(editedFrame.drawData, "    X"), nullptr);
    EXPECT_EQ(editedFrame.stats.focusedElementId, "sessionNotes");
}