Add test for LtsTimelineClassic EventDelegate.cpp

- Add test_eventdelegate.cpp with 3 tests
- Follow policy naming convention

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

qt6-after/qt6-migrated-benchmark/tests/test_eventdelegate.cpp

@@ -0,0 +1,52 @@
+#include "Lts/Common/LtsTimelineClassic/EventDelegate.h"
+
+#include <QWidget>
+#include <gtest/gtest.h>
+
+namespace LtsTimelineClassic
+{
+
+class EventDelegateTest : public ::testing::Test
+{
+  protected:
+    void SetUp() override {}
+
+    void TearDown() override {}
+};
+
+TEST(EventDelegateTest, ConstructorCreatesDelegate)
+{
+    QWidget widget;
+    EventDelegate delegate(&widget);
+
+    EXPECT_NE(delegate.parent(), nullptr);
+}
+
+TEST(EventDelegateTest, SizeHintReturnsValidSize)
+{
+    QWidget widget;
+    EventDelegate delegate(&widget);
+    QStyleOptionViewItem option;
+    QModelIndex index;
+
+    QSize size = delegate.sizeHint(option, index);
+
+    EXPECT_EQ(size.width(), 50);
+    EXPECT_EQ(size.height(), 20);
+}
+
+TEST(EventDelegateTest, SetKnownRangesStoresRanges)
+{
+    QWidget widget;
+    EventDelegate delegate(&widget);
+
+    QVector<Range> ranges;
+    ranges.append(Range(0, 100));
+    ranges.append(Range(200, 300));
+
+    // setKnownRanges is a public method - we can call it
+    // The internal storage is private, so we just verify the call compiles and doesn't crash
+    EXPECT_NO_THROW(delegate.setKnownRanges(ranges));
+}
+
+} // namespace LtsTimelineClassic