Improves utility code

src/test/java/net/knarcraft/ffmpegconverter/utility/ListUtilTest.java

@@ -7,10 +7,13 @@ import java.util.ArrayList;
 import java.util.List;
 
 import static junit.framework.TestCase.assertEquals;
+import static junit.framework.TestCase.assertTrue;
 import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertFalse;
 
 public class ListUtilTest {
     private static List<Integer> matchesList;
+    private static Integer[] containsList;
 
     @BeforeClass
     public static void setUp() {
@@ -25,6 +28,7 @@ public class ListUtilTest {
         matchesList.add(19);
         matchesList.add(21);
         matchesList.add(23);
+        containsList = new Integer[]{1, 3, 5, 7, 234, 23, 45};
     }
 
     @Test
@@ -58,4 +62,28 @@ public class ListUtilTest {
         assertEquals(expected, result);
     }
 
+    @Test
+    public void listContainsFalse() {
+        assertFalse(ListUtil.listContains(containsList, (item) -> item == 0));
+    }
+
+    @Test
+    public void listContainsTrue() {
+        assertTrue(ListUtil.listContains(containsList, (item) -> item == 234));
+    }
+
+    @Test
+    public void getList() {
+        List<String> inputList = new ArrayList<>();
+        inputList.add("some test string");
+        inputList.add("some,test,string");
+        inputList.add("some te,st string");
+        String[] result1 = ListUtil.getList(inputList, 0);
+        String[] result2 = ListUtil.getList(inputList, 1);
+        String[] result3 = ListUtil.getList(inputList, 2);
+        assertArrayEquals(new String[]{"some test string"}, result1);
+        assertArrayEquals(new String[]{"some", "test", "string"}, result2);
+        assertArrayEquals(new String[]{"some te", "st string"}, result3);
+    }
+
 }