new MyTransformation("A", "B"), new MyTransformation("B", "C"),
new MyTransformation("C", "A")));
System.out.println(transformations);
assertEquals(2, transformations.getPath("C", "B").size());
new MyTransformation("A", "B"), new MyTransformation("B", "C"),
new MyTransformation("C", "A")));
System.out.println(transformations);
assertEquals(2, transformations.getPath("C", "B").size());