diff --git a/quickstep/tests/multivalentTests/src/com/android/quickstep/MultiStateCallbackTest.java b/quickstep/tests/multivalentTests/src/com/android/quickstep/MultiStateCallbackTest.java
new file mode 100644
index 0000000000..0ff142a47b
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+++ b/quickstep/tests/multivalentTests/src/com/android/quickstep/MultiStateCallbackTest.java
@@ -0,0 +1,271 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.quickstep;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.ArgumentMatchers.anyBoolean;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+import androidx.test.filters.SmallTest;
+import androidx.test.platform.app.InstrumentationRegistry;
+
+import com.android.launcher3.util.LauncherMultivalentJUnit;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.util.function.Consumer;
+
+@SmallTest
+@RunWith(LauncherMultivalentJUnit.class)
+public class MultiStateCallbackTest {
+
+    private int mFlagCount = 0;
+    private int getNextStateFlag() {
+        int index = 1 << mFlagCount;
+        mFlagCount++;
+        return index;
+    }
+
+    private final MultiStateCallback mMultiStateCallback = new MultiStateCallback(new String[0]);
+    private final Runnable mCallback = spy(new Runnable() {
+        @Override
+        public void run() {}
+    });
+    private final Consumer<Boolean> mListener = spy(new Consumer<Boolean>() {
+        @Override
+        public void accept(Boolean isOn) {}
+    });
+
+    @Test
+    public void testSetState_trackedProperly() {
+        int watchedAnime = getNextStateFlag();
+
+        assertThat(mMultiStateCallback.getState()).isEqualTo(0);
+        assertThat(mMultiStateCallback.hasStates(watchedAnime)).isFalse();
+
+        mMultiStateCallback.setState(watchedAnime);
+
+        assertThat(mMultiStateCallback.getState()).isEqualTo(watchedAnime);
+        assertThat(mMultiStateCallback.hasStates(watchedAnime)).isTrue();
+    }
+
+    @Test
+    public void testSetState_withMultipleStates_trackedProperly() {
+        int watchedAnime = getNextStateFlag();
+        int sharedMemes = getNextStateFlag();
+
+        mMultiStateCallback.setState(watchedAnime);
+        mMultiStateCallback.setState(sharedMemes);
+
+        assertThat(mMultiStateCallback.getState()).isEqualTo(watchedAnime | sharedMemes);
+        assertThat(mMultiStateCallback.hasStates(watchedAnime)).isTrue();
+        assertThat(mMultiStateCallback.hasStates(sharedMemes)).isTrue();
+        assertThat(mMultiStateCallback.hasStates(watchedAnime | sharedMemes)).isTrue();
+    }
+
+    @Test
+    public void testClearState_trackedProperly() {
+        int lovedAnime = getNextStateFlag();
+
+        mMultiStateCallback.setState(lovedAnime);
+        mMultiStateCallback.clearState(lovedAnime);
+
+        assertThat(mMultiStateCallback.getState()).isEqualTo(0);
+        assertThat(mMultiStateCallback.hasStates(lovedAnime)).isFalse();
+    }
+
+    @Test
+    public void testClearState_withMultipleState_trackedProperly() {
+        int lovedAnime = getNextStateFlag();
+        int talkedAboutAnime = getNextStateFlag();
+
+        mMultiStateCallback.setState(lovedAnime);
+        mMultiStateCallback.setState(talkedAboutAnime);
+        mMultiStateCallback.clearState(talkedAboutAnime);
+
+        assertThat(mMultiStateCallback.getState()).isEqualTo(lovedAnime);
+        assertThat(mMultiStateCallback.hasStates(lovedAnime)).isTrue();
+        assertThat(mMultiStateCallback.hasStates(talkedAboutAnime)).isFalse();
+        assertThat(mMultiStateCallback.hasStates(lovedAnime | talkedAboutAnime)).isFalse();
+    }
+
+    @Test
+    public void testCallbackDoesNotRun_withoutState() {
+        int watchedOnePiece = getNextStateFlag();
+
+        mMultiStateCallback.runOnceAtState(watchedOnePiece, mCallback);
+
+        verify(mCallback, never()).run();
+    }
+
+    @Test
+    public void testCallbackDoesNotRun_whenNotTracked() {
+        int watchedJujutsuKaisen = getNextStateFlag();
+
+        mMultiStateCallback.setState(watchedJujutsuKaisen);
+
+        verify(mCallback, never()).run();
+    }
+
+    @Test
+    public void testCallbackRuns_afterTrackedAndStateSet() {
+        int watchedHunterXHunter = getNextStateFlag();
+
+        mMultiStateCallback.runOnceAtState(watchedHunterXHunter, mCallback);
+        mMultiStateCallback.setState(watchedHunterXHunter);
+
+        verify(mCallback, times(1)).run();
+    }
+
+    @Test
+    public void testCallbackRuns_onUiThread() {
+        int watchedHunterXHunter = getNextStateFlag();
+
+        mMultiStateCallback.runOnceAtState(watchedHunterXHunter, mCallback);
+        mMultiStateCallback.setStateOnUiThread(watchedHunterXHunter);
+
+        runOnMainSync(() -> verify(mCallback, times(1)).run());
+    }
+
+    @Test
+    public void testCallbackRuns_agnosticallyToCallOrder() {
+        int watchedFullMetalAlchemist = getNextStateFlag();
+
+        mMultiStateCallback.setState(watchedFullMetalAlchemist);
+        mMultiStateCallback.runOnceAtState(watchedFullMetalAlchemist, mCallback);
+
+        verify(mCallback, times(1)).run();
+    }
+
+    @Test
+    public void testCallbackRuns_onlyOnceAfterStateSet() {
+        int watchedBleach = getNextStateFlag();
+
+        mMultiStateCallback.runOnceAtState(watchedBleach, mCallback);
+        mMultiStateCallback.setState(watchedBleach);
+        mMultiStateCallback.setState(watchedBleach);
+
+        verify(mCallback, times(1)).run();
+    }
+
+    @Test
+    public void testCallbackRuns_onlyOnceAfterClearState() {
+        int rememberedGreatShow = getNextStateFlag();
+
+        mMultiStateCallback.runOnceAtState(rememberedGreatShow, mCallback);
+        mMultiStateCallback.setState(rememberedGreatShow);
+        mMultiStateCallback.clearState(rememberedGreatShow);
+        mMultiStateCallback.setState(rememberedGreatShow);
+
+        verify(mCallback, times(1)).run();
+    }
+
+    @Test
+    public void testCallbackDoesNotRun_withoutFullStateSet() {
+        int watchedMobPsycho = getNextStateFlag();
+        int watchedVinlandSaga = getNextStateFlag();
+
+        mMultiStateCallback.runOnceAtState(watchedMobPsycho | watchedVinlandSaga, mCallback);
+        mMultiStateCallback.setState(watchedMobPsycho);
+
+        verify(mCallback, times(0)).run();
+    }
+
+    @Test
+    public void testCallbackRuns_withFullStateSet_agnosticallyToCallOrder() {
+        int watchedReZero = getNextStateFlag();
+        int watchedJojosBizareAdventure = getNextStateFlag();
+
+        mMultiStateCallback.setState(watchedJojosBizareAdventure);
+        mMultiStateCallback.runOnceAtState(watchedReZero | watchedJojosBizareAdventure, mCallback);
+        mMultiStateCallback.setState(watchedReZero);
+
+        verify(mCallback, times(1)).run();
+    }
+
+    @Test
+    public void testCallbackRuns_withFullStateSet_asIntegerMask() {
+        int watchedPokemon = getNextStateFlag();
+        int watchedDigimon = getNextStateFlag();
+
+        mMultiStateCallback.runOnceAtState(watchedPokemon | watchedDigimon, mCallback);
+        mMultiStateCallback.setState(watchedPokemon | watchedDigimon);
+
+        verify(mCallback, times(1)).run();
+    }
+
+    @Test
+    public void testCallbackDoesNotRun_afterClearState() {
+        int watchedMonster = getNextStateFlag();
+        int watchedPingPong = getNextStateFlag();
+
+        mMultiStateCallback.runOnceAtState(watchedMonster | watchedPingPong, mCallback);
+        mMultiStateCallback.setState(watchedMonster);
+        mMultiStateCallback.clearState(watchedMonster);
+        mMultiStateCallback.setState(watchedPingPong);
+
+        verify(mCallback, times(0)).run();
+    }
+
+    @Test
+    public void testlistenerRuns_multipleTimes() {
+        int watchedSteinsGate = getNextStateFlag();
+
+        mMultiStateCallback.addChangeListener(watchedSteinsGate, mListener);
+        mMultiStateCallback.setState(watchedSteinsGate);
+
+        // Called exactly one
+        verify(mListener, times(1)).accept(anyBoolean());
+        // Called exactly once with isOn = true
+        verify(mListener, times(1)).accept(eq(true));
+        // Never called with isOn = false
+        verify(mListener, times(0)).accept(eq(false));
+
+        mMultiStateCallback.clearState(watchedSteinsGate);
+
+        // Called exactly twice
+        verify(mListener, times(2)).accept(anyBoolean());
+        // Called exactly once with isOn = true
+        verify(mListener, times(1)).accept(eq(true));
+        // Called exactly once with isOn = false
+        verify(mListener, times(1)).accept(eq(false));
+    }
+
+    @Test
+    public void testlistenerDoesNotRun_forUnchangedState() {
+        int watchedSteinsGate = getNextStateFlag();
+
+        mMultiStateCallback.addChangeListener(watchedSteinsGate, mListener);
+        mMultiStateCallback.setState(watchedSteinsGate);
+        mMultiStateCallback.setState(watchedSteinsGate);
+
+        // State remained unchanged
+        verify(mListener, times(1)).accept(anyBoolean());
+        // Called exactly once with isOn = true
+        verify(mListener, times(1)).accept(eq(true));
+    }
+
+    private static void runOnMainSync(Runnable runnable) {
+        InstrumentationRegistry.getInstrumentation().runOnMainSync(runnable);
+    }
+}