@PublicAPI(usage = ACCESS)
    public static Transformer matching(String packageIdentifier) {
        PackageMatchingSliceIdentifier sliceIdentifier = new PackageMatchingSliceIdentifier(packageIdentifier);
        String description = "slices matching " + sliceIdentifier.getDescription();
        return new Transformer(sliceIdentifier, description);
    }
@Test
    public void default_naming_slices() {
        JavaClasses classes = importClassesWithContext(Object.class, String.class, Pattern.class);
        DescribedIterable<Slice> slices = Slices.matching("java.(*)..").transform(classes);

        assertThat(slices).extractingResultOf("getDescription").containsOnly("Slice lang", "Slice util");
    }