Fix AppStorageSizeTest

Bug: 236346018
Test: atest SpaPrivilegedLibTests
Change-Id: Ic6e5145011a6c3f2ff8550b6ffc02c8c10b2353a
diff --git a/packages/SettingsLib/SpaPrivileged/tests/src/com/android/settingslib/spaprivileged/template/app/AppStorageSizeTest.kt b/packages/SettingsLib/SpaPrivileged/tests/src/com/android/settingslib/spaprivileged/template/app/AppStorageSizeTest.kt
index cec6d7d..b3638c2 100644
--- a/packages/SettingsLib/SpaPrivileged/tests/src/com/android/settingslib/spaprivileged/template/app/AppStorageSizeTest.kt
+++ b/packages/SettingsLib/SpaPrivileged/tests/src/com/android/settingslib/spaprivileged/template/app/AppStorageSizeTest.kt
@@ -28,7 +28,6 @@
 import com.android.settingslib.spa.framework.compose.stateOf
 import com.android.settingslib.spaprivileged.framework.common.storageStatsManager
 import com.android.settingslib.spaprivileged.model.app.userHandle
-import com.google.common.truth.Truth.assertThat
 import java.util.UUID
 import org.junit.Before
 import org.junit.Rule
@@ -77,7 +76,7 @@
             }
         }
 
-        assertThat(storageSize.value).isEqualTo("123 B")
+        composeTestRule.waitUntil { storageSize.value == "123 B" }
     }
 
     companion object {