diff --git a/src/test/signalpathtest.h b/src/test/signalpathtest.h
index 4cf38a465325..1136656ed6b8 100644
--- a/src/test/signalpathtest.h
+++ b/src/test/signalpathtest.h
@@ -164,6 +164,23 @@ class BaseSignalPathTest : public MixxxTest, SoundSourceProviderRegistration {
         m_pNumDecks->set(m_pNumDecks->get() + 1);
     }
 
+    void ejectTrack(Deck* pDeck) {
+        EngineDeck* pEngineDeck = pDeck->getEngineDeck();
+        if (!pEngineDeck->getEngineBuffer()->isTrackLoaded()) {
+            return;
+        }
+        pEngineDeck->getEngineBuffer()->ejectTrack();
+
+        // Wait for the track to unload.
+        for (int i = 0; i < 2000; ++i) {
+            if (!pEngineDeck->getEngineBuffer()->isTrackLoaded()) {
+                break;
+            }
+            QTest::qSleep(1); // sleep 1 ms for waiting 2 s at max
+        }
+        DEBUG_ASSERT(!pEngineDeck->getEngineBuffer()->isTrackLoaded());
+    }
+
     void loadTrack(Deck* pDeck, TrackPointer pTrack) {
         EngineDeck* pEngineDeck = pDeck->getEngineDeck();
         if (pEngineDeck->getEngineBuffer()->isTrackLoaded()) {
diff --git a/src/test/stemcontrolobjecttest.cpp b/src/test/stemcontrolobjecttest.cpp
index 9a86b50ef018..819b4559b862 100644
--- a/src/test/stemcontrolobjecttest.cpp
+++ b/src/test/stemcontrolobjecttest.cpp
@@ -103,6 +103,7 @@ class StemControlTest : public BaseSignalPathTest {
         // CachingReaderWorker::trackLoaded (CachingReader) ->
         // EngineBuffer::loaded (CachingReader, direct) ->
         // BaseTrackPlayerImpl::slotTrackLoaded  (main)
+        QTest::qSleep(20); // sleep 20 ms for waiting event from CachingReaderWorker
         QCoreApplication::processEvents(QEventLoop::WaitForMoreEvents, 100);
     }
 
@@ -148,6 +149,8 @@ TEST_F(StemControlTest, StemColor) {
     EXPECT_EQ(m_pStem3Color->get(), 0x00 << 16 | 0xe8 << 8 | 0xe8);
     EXPECT_EQ(m_pStem4Color->get(), 0xad << 16 | 0x65 << 8 | 0xff);
 
+    ejectTrack(m_pMixerDeck1);
+
     QString kTrackLocationTest = getTestDir().filePath(QStringLiteral("sine-30.wav"));
     TrackPointer pTrack(Track::newTemporary(kTrackLocationTest));
     loadTrack(m_pMixerDeck1, pTrack);
@@ -157,6 +160,8 @@ TEST_F(StemControlTest, StemColor) {
     EXPECT_EQ(m_pStem3Color->get(), -1.0);
     EXPECT_EQ(m_pStem4Color->get(), -1.0);
 
+    ejectTrack(m_pMixerDeck1);
+
     kTrackLocationTest = getTestDir().filePath("stems/test.stem.mp4");
     pTrack = Track::newTemporary(kTrackLocationTest);
     loadTrack(m_pMixerDeck1, pTrack);