The format version in one place and the layer context menu (12.10a)

tests/LayerContextMenuFixtures.h

@@ -0,0 +1,63 @@
+#pragma once
+#include "UI/NativeLayerList.h"
+#include <QMenu>
+#include <QtTest>
+#include <memory>
+#include <stdexcept>
+
+// What the context menu tests share.
+namespace {
+// Two red pixel layers, the top one with a stroke.
+inline std::unique_ptr<EditorSession> paintedPair()
+{
+    auto session = std::make_unique<EditorSession>();
+    session->createDocument(8, 8);
+    for (int layer = 0; layer < 2; ++layer) {
+        QImage pixels(8, 8, QImage::Format_RGBA8888_Premultiplied);
+        pixels.fill(Qt::red);
+        session->insert(ImportedImage(pixels, pixels, QStringLiteral("Red")));
+    }
+    session->setEffects(LayerEffects{.stroke = StrokeEffect()});
+    return session;
+}
+
+// Swift's sessionWithThreeLayers: three blank layers, 800 by 600.
+inline std::unique_ptr<EditorSession> threeLayers()
+{
+    auto session = std::make_unique<EditorSession>();
+    session->createDocument(800, 600);
+    for (int layer = 0; layer < 3; ++layer)
+        session->addBlankLayer();
+    return session;
+}
+
+struct Shown {
+    NativeLayerList list;
+    explicit Shown(EditorSession &session) : list(session)
+    {
+        list.resize(252, 400);
+        list.show();
+        if (!QTest::qWaitForWindowActive(&list))
+            throw std::runtime_error("the list never became active");
+    }
+    LayerCell &row(int index) { return *list.cells().at(size_t(index)); }
+    // A press on the row's name, away from every control.
+    std::unique_ptr<QMenu> menu(int index) { return list.menuFor(row(index), QPoint(row(index).width() - 20, 20)); }
+};
+
+inline QAction &item(QMenu &menu, const char *name)
+{
+    auto *found = menu.findChild<QAction *>(QString::fromLatin1(name));
+    if (!found)
+        throw std::runtime_error(name);
+    return *found;
+}
+
+inline QStringList titles(const QMenu &menu)
+{
+    QStringList result;
+    for (const QAction *action : menu.actions())
+        result << (action->isSeparator() ? QStringLiteral("-") : action->text());
+    return result;
+}
+}