import java.io.*;
import java.util.jar.*;

// NOTE: We deliberately use JarInputStream and not JarFile here!
JarInputStream jarStream = new JarInputStream( new FileInputStream( new File( basedir, "target/test-1.0.jar" ) ) );
Manifest mf = jarStream.getManifest();
jarStream.close();

if ( mf == null )
{
    throw new IllegalStateException( "META-INF/MANIFEST.MF is missing" );
}

if ( !"PASSED".equals( mf.getMainAttributes().getValue( "Test-Entry" ) ) )
{
    throw new IllegalStateException( "META-INF/MANIFEST.MF is incomplete" );
}

if ( !"PASSED".equals( mf.getMainAttributes().getValue( "Original-Entry" ) ) )
{
    throw new IllegalStateException( "META-INF/MANIFEST.MF is incomplete" );
}

if ( !"org.apache.maven.Shade".equals( mf.getMainAttributes().getValue( "Main-Class" ) ) )
{
    throw new IllegalStateException( "META-INF/MANIFEST.MF is incomplete" );
}