@Test
public void testExtensionRenamingIsReversible() {
Renaming r = Renaming.extension(sid, ssid, name, sname);
assertTrue(r.isReversible());
Renaming reverse = Renaming.extension(ssid, sid, sname, name);
assertEquals(reverse, r.reverse());
}
@Test
public void testProjectOnExtension() {
Renaming r = Renaming.extension(sid, ssid, name, sname);
Renaming expected = Renaming.extension(name, sname);
// it works with a subset of original attributes
AttrList list = AttrList.attrs(name);
Renaming got = r.project(list);
assertEquals(expected, got);
// it is robust to a superset too (city was not part of it)
list = AttrList.attrs(name, city);
got = r.project(list);
assertEquals(expected, got);
}
@Test
public void testExtensionRenamingIsTotal() {
Renaming r = Renaming.extension(sid, ssid, name, sname);
assertEquals(r.apply(city), city);
}
@Test
public void testItSupportsExtensionRenaming() {
Renaming r = Renaming.extension(sid, ssid, name, sname);
assertEquals(r.apply(sid), ssid);
assertEquals(r.apply(name), sname);
}