public File createFile(File dir, String filename, String contents, String encoding) throws IOException {
        File file = new File(dir, filename);

        file.getParentFile().mkdirs();

        FileUtils.fileWrite(file.getPath(), encoding, contents);

        markForDeletion(file);

        return file;
    }

    public String getFileContents(File file, String encoding) throws IOException {

                "Transfer listener still registered after getArtifact");

        /* putArtifact */
        File sampleFile = getTestFile("target/test-file");
        FileUtils.fileWrite(sampleFile.getAbsolutePath(), "sample file");

        assertFalse(
                wagon.getTransferEventSupport().hasTransferListener(transferListener),
                "Transfer listener is registered before test");