/*
 * Copyright 2021 Google LLC
 *
 * 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.example.bigtable;

import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.assertNotNull;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import org.junit.After;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;

public class ConfigureConnectionPoolTest {

  private static String projectId;
  private static String instanceId;
  private static PrintStream originalOut;
  private static ByteArrayOutputStream bout;

  private static String requireEnv(String varName) {
    assertNotNull(
        System.getenv(varName),
        "Environment variable '%s' is required to perform these tests.".format(varName));
    return System.getenv(varName);
  }

  @BeforeClass
  public static void beforeClass() {
    projectId = requireEnv("GOOGLE_CLOUD_PROJECT");
    instanceId = requireEnv("BIGTABLE_TESTING_INSTANCE");
  }

  @Before
  public void setupStream() {
    originalOut = System.out;
    bout = new ByteArrayOutputStream();
    System.setOut(new PrintStream(bout));
  }

  @After
  public void tearDown() {
    System.setOut(originalOut);
    bout.reset();
  }

  @Test
  public void testConfigureConnectionPool() {
    ConfigureConnectionPool.configureConnectionPool(projectId, instanceId);

    String output = bout.toString();
    assertThat(output).contains("Connected with pool size of 10");
  }
}
