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test(markdown): fix flaky RenderThrottle leading/trailing edge case #548

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Merged
deepin-bot merged 1 commit into from
Aug 27, 2026
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test(markdown): fix flaky RenderThrottle leading/trailing edge case #548

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19 changes: 12 additions & 7 deletions tests/src/editor/markdown/ut_renderthrottle.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -26,19 +26,24 @@ TEST_F(UT_RenderThrottle, DefaultNotReady)
EXPECT_FALSE(t.isReady());
}

// 300ms 内多次输入：前沿渲染首个内容 + 后沿渲染最新内容（共 2 次，各自延迟 ≤300ms）
// 冷却窗口内多次输入：前沿渲染首个内容 + 后沿渲染最新内容（共 2 次，各自延迟 ≤300ms）
// 注：输入必须背靠背同步调用——同步调用之间事件循环不运转，300ms 定时器不可能触发，
// 从而保证 b/c 确定性地落在冷却窗口内。若用 qWait 分隔输入，高负载（ASan+gcov 全量
// 运行）下 qWait 超时会使输入落到冷却期外而成为新前沿，得到 3 次渲染（时序抖动，非缺陷）
TEST_F(UT_RenderThrottle, MultipleInputs_Within300ms_LeadingAndTrailing)
{
RenderThrottle t;
t.setReady(true);
QSignalSpy spy(&t, &RenderThrottle::renderRequested);

t.noteContent(QStringLiteral("a"));
QTest::qWait(100);
t.noteContent(QStringLiteral("b"));
QTest::qWait(100);
t.noteContent(QStringLiteral("c"));
QTest::qWait(350); // 等后沿补发完成
t.noteContent(QStringLiteral("a")); // 前沿：立即渲染 "a"，进入 300ms 冷却
ASSERT_EQ(spy.count(), 1);
t.noteContent(QStringLiteral("b")); // 冷却期内累积
t.noteContent(QStringLiteral("c")); // pending 更新为最新 "c"

// 轮询等待后沿补发（单次 qWait 在事件循环被饿死时可能错过定时器投递）
for (int i = 0; i < 250 && spy.count() < 2; ++i)
QTest::qWait(20);

ASSERT_EQ(spy.count(), 2); // 前沿 "a" + 后沿 "c"
EXPECT_EQ(spy.takeFirst().at(0).toString(), QStringLiteral("a"));
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