add indexOf(value) and indexOf(value, offset)

primitiveCollections/src/test/java/org/lucares/collections/IntListTest.java

@@ -583,4 +583,36 @@ public class IntListTest {
 		Assert.assertNotEquals("should use parallelism during computation", processingOrder.toString(),
 				list.toString());
 	}
+
+	@Test
+	public void testIndexOf() {
+		final IntList list = new IntList();
+		Assert.assertEquals(-1, list.indexOf(0));
+
+		list.add(1);
+		Assert.assertEquals(-1, list.indexOf(0));
+		Assert.assertEquals(0, list.indexOf(1));
+
+		list.add(2);
+		Assert.assertEquals(-1, list.indexOf(0));
+		Assert.assertEquals(0, list.indexOf(1));
+		Assert.assertEquals(1, list.indexOf(2));
+	}
+
+	@Test
+	public void testIndexOfWithOffset() {
+		final IntList list = new IntList();
+		list.addAll(0, 2, 0, 2);
+		Assert.assertEquals(1, list.indexOf(2, 0));
+		Assert.assertEquals(1, list.indexOf(2, 1));
+		Assert.assertEquals(3, list.indexOf(2, 2));
+		Assert.assertEquals(3, list.indexOf(2, 3));
+		Assert.assertEquals(-1, list.indexOf(2, 4));
+
+		// indexed returned by indexOf() are consistent with get()
+		Assert.assertEquals(list.get(list.indexOf(2, 0)), 2);
+		Assert.assertEquals(list.get(list.indexOf(2, 1)), 2);
+		Assert.assertEquals(list.get(list.indexOf(2, 2)), 2);
+		Assert.assertEquals(list.get(list.indexOf(2, 3)), 2);
+	}
 }