[AW] DevUI: add basic espresso tests for CrashesListFragment

Add basic UI espresso tests to make sure the correct UI elements and
info are shown for different crash reports status.

Fixed: 1106312
Test: run_webview_instrumentation_test_apk -f "*android_webview.devui*"
Change-Id: Idf16e513133db7592887f2b881b1ffefe3792b43
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2376805
Commit-Queue: Hazem Ashmawy <hazems@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804515}

android_webview/nonembedded/java/src/org/chromium/android_webview/devui/CrashesListFragment.java

@@ -29,8 +29,10 @@ import android.widget.ImageView;
 import android.widget.TextView;
 
 import androidx.annotation.IntDef;
+import androidx.annotation.MainThread;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.annotation.VisibleForTesting;
 import androidx.annotation.WorkerThread;
 
 import org.chromium.android_webview.common.DeveloperModeUtils;
@@ -61,11 +63,13 @@ public class CrashesListFragment extends DevUiBaseFragment {
     private static final String TAG = "WebViewDevTools";
 
     // Max number of crashes to show in the crashes list.
-    private static final int MAX_CRASHES_NUMBER = 20;
+    public static final int MAX_CRASHES_NUMBER = 20;
 
     private CrashListExpandableAdapter mCrashListViewAdapter;
     private Context mContext;
 
+    private static @Nullable Runnable sCrashInfoLoadedListener;
+
     // These values are persisted to logs. Entries should not be renumbered and
     // numeric values should never be reused.
     @IntDef({CollectionState.ENABLED_BY_COMMANDLINE, CollectionState.ENABLED_BY_FLAG_UI,
@@ -390,13 +394,15 @@ public class CrashesListFragment extends DevUiBaseFragment {
                 protected void onPostExecute(List<CrashInfo> result) {
                     mCrashInfoList = result;
                     notifyDataSetChanged();
+                    if (sCrashInfoLoadedListener != null) sCrashInfoLoadedListener.run();
                 }
             };
             asyncTask.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
         }
     }
 
-    private static String uploadStateString(UploadState uploadState) {
+    @VisibleForTesting
+    public static String uploadStateString(UploadState uploadState) {
         switch (uploadState) {
             case UPLOADED:
                 return "Uploaded";
@@ -511,6 +517,15 @@ public class CrashesListFragment extends DevUiBaseFragment {
         return dialogBuilder.create();
     }
 
+    /**
+     * Notifies the caller when all CrashInfo is reloaded in the ListView.
+     */
+    @MainThread
+    @VisibleForTesting
+    public static void setCrashInfoLoadedListenerForTesting(@Nullable Runnable listener) {
+        sCrashInfoLoadedListener = listener;
+    }
+
     @Override
     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
         inflater.inflate(R.menu.crashes_options_menu, menu);

android_webview/test/BUILD.gn

@@ -318,6 +318,7 @@ instrumentation_test_apk("webview_instrumentation_test_apk") {
     "../javatests/src/org/chromium/android_webview/test/common/crash/CrashInfoTest.java",
     "../javatests/src/org/chromium/android_webview/test/common/variations/VariationsUtilsTest.java",
     "../javatests/src/org/chromium/android_webview/test/devui/AwNonembeddedUmaRecorderTest.java",
+    "../javatests/src/org/chromium/android_webview/test/devui/CrashesListFragmentTest.java",
     "../javatests/src/org/chromium/android_webview/test/devui/DeveloperUiTest.java",
     "../javatests/src/org/chromium/android_webview/test/devui/DeveloperUiTestUtils.java",
     "../javatests/src/org/chromium/android_webview/test/devui/FlagsFragmentTest.java",