private Main() {
        // Utility Class.
    }
@Test
    public void downloadsDependenciesForGithub() throws Exception {
        final File pwd = temp.newFolder();
        Main.main(String.format("--workdir=%s", pwd.getAbsolutePath()));
        final Path logstash = pwd.toPath().resolve("logstash").resolve("logstash-main");
        assertThat(logstash.toFile().exists(), is(true));
        final File jruby = pwd.toPath().resolve("jruby").toFile();
        assertThat(jruby.exists(), is(true));
        assertThat(jruby.isDirectory(), is(true));
        assertThat(logstash.resolve("Gemfile").toFile().exists(), is(true));
    }