final PackagingFacet facet = project.getFacet(PackagingFacet.class);
ProjectBuilder builder = facet.createBuilder();
ByteArrayOutputStream out = new ByteArrayOutputStream();
ByteArrayOutputStream err = new ByteArrayOutputStream();
builder.addArguments("clean", "--quiet").runTests(false)
.build(new PrintStream(out, true), new PrintStream(err, true));
Assert.assertEquals(0, err.size());
Assert.assertEquals(0, out.size());
}