diff --git a/services/tests/servicestests/src/com/android/server/hdmi/HdmiUtilsTest.java b/services/tests/servicestests/src/com/android/server/hdmi/HdmiUtilsTest.java
index 9f0cdd56ed7f1..225f5b3063593 100644
--- a/services/tests/servicestests/src/com/android/server/hdmi/HdmiUtilsTest.java
+++ b/services/tests/servicestests/src/com/android/server/hdmi/HdmiUtilsTest.java
@@ -31,6 +31,8 @@ import androidx.test.filters.SmallTest;
 import com.android.server.hdmi.HdmiUtils.CodecSad;
 import com.android.server.hdmi.HdmiUtils.DeviceConfig;
 
+import com.google.common.testing.EqualsTester;
+
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
@@ -115,6 +117,22 @@ public class HdmiUtilsTest {
                         HdmiUtils.TARGET_NOT_UNDER_LOCAL_DEVICE);
     }
 
+    @Test
+    public void testEqualsCodecSad() {
+        byte[] sad = {0x0a, 0x1b, 0x2c};
+        String sadString = "0a1b2c";
+        new EqualsTester()
+                .addEqualityGroup(
+                        new HdmiUtils.CodecSad(Constants.AUDIO_CODEC_LPCM, sad),
+                        new HdmiUtils.CodecSad(Constants.AUDIO_CODEC_LPCM, sadString))
+                .addEqualityGroup(
+                        new HdmiUtils.CodecSad(Constants.AUDIO_CODEC_LPCM, sadString + "01"))
+                .addEqualityGroup(new HdmiUtils.CodecSad(Constants.AUDIO_CODEC_DD, sadString))
+                .addEqualityGroup(
+                        new HdmiUtils.CodecSad(Constants.AUDIO_CODEC_DD, sadString + "01"))
+                .testEquals();
+    }
+
     @Test
     public void parseSampleXML() {
         List<DeviceConfig> config = new ArrayList<>();