@Test
public void testDiffs() throws Exception {
PackageAndProjectData pZero = new PackageAndProjectData(
buildBaseProjectData(), "an.ignored.name");
ProjectData one = buildOneCoverage();
PackageAndProjectData pOne = new PackageAndProjectData(one, "com.one");
ProjectData two = buildOneCoverage();
addSomeStuff(two, "foo", 2);
addSomeStuff(two, "baz", 8);
PackageAndProjectData pTwo = new PackageAndProjectData(two, "com.two");
ProjectData three = buildOneCoverage();
addSomeStuff(three, "foo", 2);
addSomeStuff(three, "baz", 8);
addSomeStuff(three, "bar", 1);
addSomeStuff(three, "foo", 8);
PackageAndProjectData pThree = new PackageAndProjectData(three,