Clear pattern message when showing it again

    @Override

    public void onResume(int reason) {

        displayDefaultSecurityMessage();

    }

    @Override

/*

 * 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.keyguard

import android.support.test.filters.SmallTest

import android.testing.AndroidTestingRunner

import android.testing.TestableLooper

import android.view.LayoutInflater

import com.android.systemui.SysuiTestCase

import com.google.common.truth.Truth.assertThat

import org.junit.Before

import org.junit.Test

import org.junit.runner.RunWith

@SmallTest

@RunWith(AndroidTestingRunner::class)

@TestableLooper.RunWithLooper

class KeyguardPatternViewTest : SysuiTestCase() {

    private lateinit var mKeyguardPatternView: KeyguardPatternView

    private lateinit var mSecurityMessage: KeyguardMessageArea

    @Before

    fun setup() {

        val inflater = LayoutInflater.from(context)

        mKeyguardPatternView = inflater.inflate(R.layout.keyguard_pattern_view, null)

                as KeyguardPatternView

        mSecurityMessage = KeyguardMessageArea.findSecurityMessageDisplay(mKeyguardPatternView)

                as KeyguardMessageArea

    }

    @Test

    fun onResume_clearsTextField() {

        mSecurityMessage.setMessage("an old message")

        mKeyguardPatternView.onResume(KeyguardSecurityView.SCREEN_ON)

        assertThat(mSecurityMessage.text).isEqualTo("")

    }

}