EnvironmentTest.java

/*
 * Copyright 2014-2016 CyberVision, Inc.
 *
 * 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 org.kaaproject.kaa.server.common;

import static org.mockito.Matchers.any;
import static org.mockito.Mockito.atLeastOnce;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;

import org.junit.Test;
import org.slf4j.Logger;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;

public class EnvironmentTest {

  @Test
  public void logStateTest() throws Exception {
    Logger LOG = mock(Logger.class);
    Field logField = Environment.class.getDeclaredField("LOG");
    // set final static field
    setFinalStatic(logField, LOG);
    Environment.logState();
    verify(LOG, atLeastOnce()).info(any(String.class), any(Version.class), any(Version.class));
  }

  // sets final static field to an object
  private void setFinalStatic(Field field, Object newValue) throws Exception {
    field.setAccessible(true);

    Field modifiersField = Field.class.getDeclaredField("modifiers");
    modifiersField.setAccessible(true);
    modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);

    field.set(null, newValue);
  }
}