diff --git a/src/com/android/launcher3/LauncherModel.java b/src/com/android/launcher3/LauncherModel.java
index 5e09f8a..316e23f 100644
--- a/src/com/android/launcher3/LauncherModel.java
+++ b/src/com/android/launcher3/LauncherModel.java
@@ -212,6 +212,11 @@
 
     static void checkItemInfoLocked(
             final long itemId, final ItemInfo item, StackTraceElement[] stackTrace) {
+        if (com.android.launcher3.Utilities.IS_RUNNING_IN_TEST_HARNESS
+                && com.android.launcher3.Utilities.IS_DEBUG_DEVICE) {
+            android.util.Log.d("b/117332845",
+                    "Checking item: " + android.util.Log.getStackTraceString(new Throwable()));
+        }
         ItemInfo modelItem = sBgDataModel.itemsIdMap.get(itemId);
         if (modelItem != null && item != modelItem) {
             // check all the data is consistent
diff --git a/src/com/android/launcher3/model/LoaderResults.java b/src/com/android/launcher3/model/LoaderResults.java
index 5778936..033e3f5 100644
--- a/src/com/android/launcher3/model/LoaderResults.java
+++ b/src/com/android/launcher3/model/LoaderResults.java
@@ -296,6 +296,11 @@
             final ArrayList<LauncherAppWidgetInfo> appWidgets,
             final Executor executor) {
 
+        if (com.android.launcher3.Utilities.IS_RUNNING_IN_TEST_HARNESS
+                && com.android.launcher3.Utilities.IS_DEBUG_DEVICE) {
+            android.util.Log.d("b/117332845",
+                    android.util.Log.getStackTraceString(new Throwable()));
+        }
         // Bind the workspace items
         int N = workspaceItems.size();
         for (int i = 0; i < N; i += ITEMS_CHUNK) {
diff --git a/src/com/android/launcher3/model/LoaderTask.java b/src/com/android/launcher3/model/LoaderTask.java
index e0da6b1..cb78038 100644
--- a/src/com/android/launcher3/model/LoaderTask.java
+++ b/src/com/android/launcher3/model/LoaderTask.java
@@ -124,6 +124,11 @@
         mPackageInstaller = PackageInstallerCompat.getInstance(mApp.getContext());
         mAppWidgetManager = AppWidgetManagerCompat.getInstance(mApp.getContext());
         mIconCache = mApp.getIconCache();
+        if (com.android.launcher3.Utilities.IS_RUNNING_IN_TEST_HARNESS
+                && com.android.launcher3.Utilities.IS_DEBUG_DEVICE) {
+            android.util.Log.d("b/117332845",
+                    android.util.Log.getStackTraceString(new Throwable()));
+        }
     }
 
     protected synchronized void waitForIdle() {
diff --git a/src/com/android/launcher3/model/ModelWriter.java b/src/com/android/launcher3/model/ModelWriter.java
index 9f6e4f8..d81eb43 100644
--- a/src/com/android/launcher3/model/ModelWriter.java
+++ b/src/com/android/launcher3/model/ModelWriter.java
@@ -109,6 +109,11 @@
     }
 
     private void checkItemInfoLocked(long itemId, ItemInfo item, StackTraceElement[] stackTrace) {
+        if (com.android.launcher3.Utilities.IS_RUNNING_IN_TEST_HARNESS
+                && com.android.launcher3.Utilities.IS_DEBUG_DEVICE) {
+            android.util.Log.d("b/117332845",
+                    "Checking item: " + android.util.Log.getStackTraceString(new Throwable()));
+        }
         ItemInfo modelItem = mBgDataModel.itemsIdMap.get(itemId);
         if (modelItem != null && item != modelItem) {
             // check all the data is consistent
@@ -358,6 +363,11 @@
         private final long mItemId;
 
         UpdateItemRunnable(ItemInfo item, ContentWriter writer) {
+            if (com.android.launcher3.Utilities.IS_RUNNING_IN_TEST_HARNESS
+                    && com.android.launcher3.Utilities.IS_DEBUG_DEVICE) {
+                android.util.Log.d("b/117332845",
+                        android.util.Log.getStackTraceString(new Throwable()));
+            }
             mItem = item;
             mWriter = writer;
             mItemId = item.id;