assertEquals(getExpected(one, two, three), structure.getContexts());
assertEquals(one, structure.getContext("one"));
assertEquals(two, structure.getContext("two"));
assertEquals(three, structure.getContext("three"));
structure.removeContext(one);
assertEquals(getExpected(two, three), structure.getContexts());
assertNull(structure.getContext("one"));
assertEquals(two, structure.getContext("two"));
assertEquals(three, structure.getContext("three"));