Adding tests for the remaining dialogs in Settings/users.

Bug: 110489099
Test: make RunCarSettingsRoboTests
Change-Id: I142091d00ba648ff897e75c35a018fa724b7ddec
diff --git a/tests/robotests/src/com/android/car/settings/testutils/DialogTestUtils.java b/tests/robotests/src/com/android/car/settings/testutils/DialogTestUtils.java
new file mode 100644
index 0000000..f4f5517
--- /dev/null
+++ b/tests/robotests/src/com/android/car/settings/testutils/DialogTestUtils.java
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.car.settings.testutils;
+
+import android.widget.Button;
+
+import androidx.fragment.app.DialogFragment;
+
+import com.android.car.settings.R;
+
+/**
+ * Helper methods for DialogFragment testing.
+ */
+public class DialogTestUtils {
+    private DialogTestUtils() {}
+
+    /**
+     * Invokes onClick on the dialog's positive button.
+     */
+    public static void clickPositiveButton(DialogFragment dialogFragment) {
+        Button positiveButton = (Button) dialogFragment.getDialog().getWindow()
+                .findViewById(R.id.positive_button);
+        positiveButton.callOnClick();
+    }
+
+    /**
+     * Invokes onClick on the dialog's negative button.
+     */
+    public static void  clickNegativeButton(DialogFragment dialogFragment) {
+        Button negativeButton = (Button) dialogFragment.getDialog().getWindow()
+                .findViewById(R.id.negative_button);
+        negativeButton.callOnClick();
+    }
+}