@Test
public void testFirst() throws Exception {
List<String> mList = new ArrayList<>();
mList.add("x");
mList.add("y");
mList.add("z");
mList.add("w");
ImmutableList<String> l = new ArrayBackedImmutableList<String>(mList);
Assert.assertEquals("x", l.first());
Assert.assertEquals("y", l.tail(1).first());
Assert.assertEquals("z", l.subList(2, 1).first());
}
@Test
public void testHead() throws Exception {
List<String> mList = new ArrayList<>();
mList.add("x");
mList.add("y");
mList.add("z");
mList.add("w");
ImmutableList<String> l = new ArrayBackedImmutableList<String>(mList);
Assert.assertEquals("[x]", l.head(1).toString());
Assert.assertEquals("[]", l.head(0).toString());
Assert.assertEquals("[x, y, z]", l.head(3).toString());
}
@Test
public void testSublist() throws Exception {
List<String> mList = new ArrayList<>();
mList.add("x");
mList.add("y");
mList.add("z");
mList.add("w");
ImmutableList<String> l = new ArrayBackedImmutableList<String>(mList);
Assert.assertEquals("[]", l.subList(0, 0).toString());
Assert.assertEquals("[x]", l.subList(0, 1).toString());
Assert.assertEquals("[x, y]", l.subList(0, 2).toString());
Assert.assertEquals("[x, y, z]", l.subList(0, 3).toString());
Assert.assertEquals("[x, y, z, w]", l.subList(0, 4).toString());
Assert.assertEquals("[y, z, w]", l.subList(1, 3).toString());
Assert.assertEquals("[y, z]", l.subList(1, 2).toString());
Assert.assertEquals("[y, z]", l.subList(1, 2).toString());
Assert.assertEquals("[y]", l.subList(1, 1).toString());
Assert.assertEquals("[z]", l.subList(2, 1).toString());
}
@Test
public void testSet() throws Exception {
List<String> mList = new ArrayList<>();
mList.add("x");
mList.add("y");
ImmutableList<String> l = new ArrayBackedImmutableList<String>(mList);
Assert.assertEquals(l.size(), 2);
Assert.assertEquals("[x, x, y, y]", l.insert(1, l).toString());
Assert.assertEquals("[x, y, x, y]", l.insert(2, l).toString());
Assert.assertEquals("[x, y, x, y]", l.insert(0, l).toString());
Assert.assertEquals("[, x, y]", l.insert(0, "").toString());
Assert.assertEquals("[x, y, ]", l.insert(2, "").toString());
// remember, the result of these insertes was never assigned.
Assert.assertEquals(l.size(), 2);
}
@Test
public void testAppended() throws Exception {
List<String> mList = new ArrayList<>();
mList.add("cat");
mList.add("dog");
mList.add("fish");
mList.add("box");
ImmutableList<String> l = new ArrayBackedImmutableList<String>(mList);
Assert.assertEquals(l.size(), 4);
Assert.assertEquals("[cat, dog, fish, box]", l.toString());
mList.add("foo");
Assert.assertEquals(l.size(), 4);
Assert.assertEquals("[cat, dog, fish, box]", l.toString());
l = l.appended(mList);
Assert.assertEquals("[cat, dog, fish, box, cat, dog, " + "fish, box, foo]", l.toString());
Assert.assertEquals(l.size(), 9);
String x = null;
l = l.appended(x);
Assert.assertEquals("[cat, dog, fish, box, cat, dog," + " fish, box, foo, null]", l.toString());
Assert.assertEquals(l.size(), 10);
mList = new ArrayList<>(); // reinit the list
// things better not change
Assert.assertEquals("[cat, dog, fish, box, cat, dog," + " fish, box, foo, null]", l.toString());
Assert.assertEquals(l.size(), 10);
// append l to l2 from an *empty* immutablelist, l2 (mList is now empty)
ImmutableList<String> l2 = new ArrayBackedImmutableList<String>(mList);
l2 = l2.appended(l);
Assert.assertEquals(
"[cat, dog, fish, box, cat, dog," + " fish, box, foo, null]",
l2.toString()); // better be the same
}