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  package org.apache.cayenne.datasource;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  import static org.mockito.Mockito.doAnswer;
  import static org.mockito.Mockito.mock;
  
  import java.sql.SQLException;
  
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  import org.mockito.invocation.InvocationOnMock;
  import org.mockito.stubbing.Answer;
  
  public class PoolDataSourceManagerTest {
  
  	private UnmanagedPoolingDataSource mockPoolingDataSource;
  	private PoolingDataSourceManager dataSourceManager;
  
  	@Before
  	public void before() throws SQLException {
  		this.mockPoolingDataSource = mock(UnmanagedPoolingDataSource.class);
  		this.dataSourceManager = new PoolingDataSourceManager(mockPoolingDataSource, 100);
  	}
  
  	@After
  	public void after() {
  		dataSourceManager.shutdown();
  	}
  
  	@Test
  	public void testRun_Manage() throws InterruptedException {
  
  		final int[] counter = new int[1];
  
  		doAnswer(new Answer<Object>() {
  			@Override
  			public Object answer(InvocationOnMock invocation) throws Throwable {
  				counter[0]++;
  				return null;
  			}
  		}).when(mockPoolingDataSource).managePool();
  
  		dataSourceManager.start();
  
  		// we can't predict the number of 'managePool' invocations, but it
  		// should be incrementing as the time goes
  
  		int c0 = counter[0];
  		assertEquals(0, c0);
  		Thread.sleep(300);
  
  		int c1 = counter[0];
  		assertTrue(c1 > c0);
  
  		Thread.sleep(300);
  
  		int c2 = counter[0];
  		assertTrue(c2 > c1);
  	}
  }
  