package de.japrost.jabudget.serialization;
   
   import static org.assertj.core.api.Assertions.assertThat;
   
   import java.io.File;
   
   import org.junit.After;
   import org.junit.Before;
   import org.junit.Test;
  
  /**
   * Test the {@link LazyFileOutputStream}.
   */
  // TODO more tests when moving to io package.
  public class LazyFileOutputStreamTest {
  
  	private LazyFileOutputStream cut;
  	private LazyFileInputStream helper;
  
  	/**
  	 * Set cut and helping reader with a file.
  	 */
  	@Before
  	public void initCut() {
  		final File file = new File("target/LazyFile.txt");
  		cut = new LazyFileOutputStream(file);
  		helper = new LazyFileInputStream(file);
  	}
  
  	/**
  	 * Be kind and close before exit.
  	 *
  	 * @throws Exception never.
  	 */
  	@After
  	public void closeCut() throws Exception {
  		cut.close();
  		helper.close();
  	}
  
  	/**
  	 * Test that write() opens the delegate and delegates.
  	 *
  	 * @throws Exception never.
  	 */
  	@Test
  	public void testWrite() throws Exception {
  		// given
  		assertThat(cut.isOpen()).isFalse();
  		// when
  		cut.write(97);
  		// then
  		assertThat(cut.isOpen()).isTrue();
  		assertThat(helper.read()).isEqualTo(97);
  		assertThat(helper.read()).isEqualTo(-1);
  	}
  
  	/**
  	 * Test that write() opens the delegate and delegates even two times.
  	 *
  	 * @throws Exception never.
  	 */
  	@Test
  	public void testWrite_twice() throws Exception {
  		// given
  		assertThat(cut.isOpen()).isFalse();
  		// when
  		cut.write(97);
  		cut.write(32);
  		// then
  		assertThat(cut.isOpen()).isTrue();
  		assertThat(helper.read()).isEqualTo(97);
  		assertThat(helper.read()).isEqualTo(32);
  		assertThat(helper.read()).isEqualTo(-1);
  	}
  
  }