final FoDocumentReader reader = FoDocumentReader.getInstance();
final FOTreeBuilder foTree = reader.buildFoTree(
"fo/font-family-001.fo");
final Flow flow = this.getFlow(foTree);
FObj node = flow.getChildAt(0);
assertTrue(node instanceof Block);
Block block = (Block) node;
String[] fontFamilies = block.traitFontFamily(null);
assertEquals(1, fontFamilies.length);
/* The default font-family is "serif". */