TwineStoryEpubTransformer implements Transformer { @Override public final String getExtension() { return EXTENSION; } @Inject  TwineStoryEpubTransformer(
            final MarkdownProcessor pdProcessor,
            final ResourceEmbedder resourceEmbedder); @Override final void transform(final TwStorydata story, final OutputStream outputStream); @Override final String getExtension(); final void transform(final TwStorydata story,
                                final OutputStream outputStream,
                                final EpubTransformOptions options);  }
@Test public void getExtension_Default_ReturnsEpub() { String result = convertor.getExtension(); assertEquals("epub", result); }