ImageDataStoragePDETest.java

package com.codeaffine.extras.imageviewer.internal;

import static org.assertj.core.api.Assertions.assertThat;

import java.io.IOException;
import java.io.InputStream;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.ImageLoader;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;

import com.codeaffine.extras.test.util.ProjectHelper;
import com.codeaffine.test.util.lang.ThrowableCaptor;

public class ImageDataStoragePDETest {

  @Rule
  public final ProjectHelper projectHelper = new ProjectHelper();

  private ImageData imageData;

  @Before
  public void setUp() throws IOException {
    try( InputStream inputStream = getClass().getResourceAsStream( Images.GIF_IMAGE ) ) {
      imageData = new ImageLoader().load( inputStream )[ 0 ];
    }
  }

  @Test(expected=NullPointerException.class)
  public void testConstructorWithNullImageDatas() {
    new ImageDataStorage( ( ImageData[] )null );
  }

  @Test
  public void testLoadWithNullFile() {
    ImageDataStorage storage = new ImageDataStorage( imageData );
    NullProgressMonitor monitor = new NullProgressMonitor();

    Throwable throwable = ThrowableCaptor.thrownBy( () -> storage.save( null, monitor ) );

    assertThat( throwable ).isInstanceOf( NullPointerException.class );
  }

  @Test
  public void testLoadWithNullMonitor() {
    ImageDataStorage storage = new ImageDataStorage( imageData );
    IFile file = projectHelper.getProject().getFile( "file" );

    Throwable throwable = ThrowableCaptor.thrownBy( () -> storage.save( file, null ) );

    assertThat( throwable ).isInstanceOf( NullPointerException.class );
  }

  @Test
  public void testSaveWithExistingFile() throws CoreException {
    ImageDataStorage storage = new ImageDataStorage( imageData );
    IFile file = projectHelper.createFile( "image.gif", "" );

    storage.save( file, new NullProgressMonitor() );

    assertThat( file.getLocation().toFile().length() ).isGreaterThan( 0 );
  }

  @Test
  public void testSaveWithNonExistingFile() throws CoreException {
    ImageDataStorage storage = new ImageDataStorage( imageData );
    IFile file = projectHelper.getProject().getFile( "image.gif" );

    storage.save( file, new NullProgressMonitor() );

    assertThat( file.getLocation().toFile().length() ).isGreaterThan( 0 );
  }
}