add test for shimmering contact list

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

src/androidTest/java/com/owncloud/android/ui/fragment/ContactListFragmentIT.kt

@@ -0,0 +1,49 @@
+/*
+ * Nextcloud Android client application
+ *
+ * @author Andy Scherzinger
+ * Copyright (C) 2020 Andy Scherzinger
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+package com.owncloud.android.ui.fragment
+
+import androidx.test.espresso.intent.rule.IntentsTestRule
+import com.owncloud.android.AbstractIT
+import com.owncloud.android.R
+import com.owncloud.android.datamodel.OCFile
+import com.owncloud.android.ui.activity.ContactsPreferenceActivity
+import com.owncloud.android.ui.fragment.contactsbackup.ContactListFragment
+import com.owncloud.android.utils.ScreenshotTest
+import org.junit.Rule
+import org.junit.Test
+
+class ContactListFragmentIT : AbstractIT() {
+    @get:Rule
+    val testActivityRule = IntentsTestRule(ContactsPreferenceActivity::class.java, true, false)
+
+    val file = OCFile("/", "00000001")
+
+    @Test
+    @ScreenshotTest
+    fun showContactListFragmentLoading() {
+        val sut = testActivityRule.launchActivity(null)
+        val transaction = sut.supportFragmentManager.beginTransaction()
+        transaction.replace(R.id.frame_container, ContactListFragment.newInstance(file, user))
+        transaction.commit()
+
+        waitForIdleSync()
+        screenshot(sut)
+    }
+}

src/main/java/com/owncloud/android/ui/activity/ContactsPreferenceActivity.java

@@ -45,8 +45,8 @@ import androidx.fragment.app.FragmentTransaction;
  */
 public class ContactsPreferenceActivity extends FileActivity implements FileFragment.ContainerActivity {
     public static final String TAG = ContactsPreferenceActivity.class.getSimpleName();
-    protected static final String EXTRA_FILE = "FILE";
-    protected static final String EXTRA_USER = "USER";
+    public static final String EXTRA_FILE = "FILE";
+    public static final String EXTRA_USER = "USER";
     /**
      * Warning: default for this extra is different between this activity and {@link ContactsBackupFragment}
      */