Create unit test for the VpnInfoPreference

/*

 * Copyright (C) 2021 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.settings.vpn2;

import static org.junit.Assert.assertEquals;

import static org.mockito.Mockito.spy;

import static org.mockito.Mockito.verify;

import static org.mockito.Mockito.when;

import android.content.Context;

import android.content.res.Resources;

import android.util.AttributeSet;

import android.view.LayoutInflater;

import android.view.View;

import androidx.preference.PreferenceViewHolder;

import androidx.test.core.app.ApplicationProvider;

import androidx.test.ext.junit.runners.AndroidJUnit4;

import com.android.settings.testutils.ResourcesUtils;

import org.junit.Before;

import org.junit.Test;

import org.junit.runner.RunWith;

@RunWith(AndroidJUnit4.class)

public class VpnInfoPreferenceTest {

    private Context mContext;

    private Resources mResources;

    private VpnInfoPreference mVpnInfoPreference;

    private AttributeSet mAttrs;

    private PreferenceViewHolder mHolder;

    private View mWarningButton;

    @Before

    public void setUp() {

        mContext = spy(ApplicationProvider.getApplicationContext());

        mResources = spy(mContext.getResources());

        when(mContext.getResources()).thenReturn(mResources);

        final int helpUrlId = ResourcesUtils.getResourcesId(

                mContext, "string", "help_url_insecure_vpn");

        when(mResources.getString(helpUrlId)).thenReturn("https://www.google.com/");

        mVpnInfoPreference = new VpnInfoPreference(mContext, mAttrs);

        LayoutInflater inflater = mContext.getSystemService(LayoutInflater.class);

        // The VpnInfoPreference is a RestrictedPreference, which is a TwoTargetPreference

        final int layoutId = ResourcesUtils.getResourcesId(

                mContext, "layout", "preference_two_target");

        View view = inflater.inflate(

                layoutId,

                null /* root */, false /* attachToRoot */);

        mHolder = spy(PreferenceViewHolder.createInstanceForTests(view));

        final int warningButtonId = ResourcesUtils.getResourcesId(

                mContext, "id", "warning_button");

        mWarningButton = spy(new View(mContext));

        when(mWarningButton.getId()).thenReturn(warningButtonId);

        when(mHolder.findViewById(warningButtonId)).thenReturn(mWarningButton);

    }

    @Test

    public void onBindViewHolder_notInsecureVpn_iconInvisible() {

        mVpnInfoPreference.setInsecureVpn(false);

        mVpnInfoPreference.onBindViewHolder(mHolder);

        verify(mWarningButton).setVisibility(View.GONE);

        verify(mWarningButton).setEnabled(false);

    }

    @Test

    public void onBindViewHolder_emptyUrl_iconInvisible() {

        final int helpUrlId = ResourcesUtils.getResourcesId(

                mContext, "string", "help_url_insecure_vpn");

        when(mResources.getString(helpUrlId)).thenReturn("");

        VpnInfoPreference vpnInfoPreference = new VpnInfoPreference(mContext, mAttrs);

        vpnInfoPreference.setInsecureVpn(true);

        vpnInfoPreference.onBindViewHolder(mHolder);

        verify(mWarningButton).setVisibility(View.GONE);

        verify(mWarningButton).setEnabled(false);

    }

    @Test

    public void onBindViewHolder_insecureVpn_iconVisible() {

        mVpnInfoPreference.setInsecureVpn(true);

        mVpnInfoPreference.onBindViewHolder(mHolder);

        verify(mWarningButton).setVisibility(View.VISIBLE);

        verify(mWarningButton).setEnabled(true);

    }

    @Test

    public void onBindViewHolder_dividerInvisible() {

        mVpnInfoPreference.onBindViewHolder(mHolder);

        final int dividerId = ResourcesUtils.getResourcesId(mContext, "id", "two_target_divider");

        final View divider = mHolder.findViewById(dividerId);

        assertEquals(View.GONE, divider.getVisibility());

    }

}