### Question:
VfsLineageWriter implements ILineageWriter { protected OutputStream getProfileOutputStream( LineageHolder holder ) { return createOutputStream( holder, ".execution.js" ); } VfsLineageWriter(); @Override void outputExecutionProfile( LineageHolder holder ); @Override void outputLineageGraph( LineageHolder holder ); IGraphWriter getGraphWriter(); void setGraphWriter( IGraphWriter graphWriter ); String getOutputFolder(); static boolean isVFSPrefix( String prefix ); void setOutputFolder( String outputFolder ); @Override String getOutputStrategy(); @Override void setOutputStrategy( String strategy ); @Override void cleanOutput( LineageHolder holder ); static final String DEFAULT_OUTPUT_FOLDER; }### Answer:
@Test public void testGetProfileOutputStream() throws Exception { try ( OutputStream os = writer.getProfileOutputStream( holder ) ) { assertNotNull( os ); } }