Add test snapshot utility

nobuild/NoBuild.java

@@ -33,7 +33,6 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
-import java.lang.ProcessBuilder.Redirect;
 import java.net.URI;
 import java.net.URL;
 import java.nio.file.FileSystems;