[Test Week] Add ViewCacheTest

Number of new tested methods: 3

Bug: 353303621
Test: This is the unit test
Flag: NONE - unit test
Change-Id: I235ba375db12b9f3fac6f204018b32e692835eab

src/com/android/launcher3/util/ViewCache.java

@@ -21,6 +21,8 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
+import androidx.annotation.VisibleForTesting;
+
 import com.android.launcher3.R;
 
 /**
@@ -67,7 +69,8 @@ public class ViewCache {
         }
     }
 
-    private static class CacheEntry {
+    @VisibleForTesting
+    static class CacheEntry {
 
         final int mMaxSize;
         final View[] mViews;