Array to List tests (#3960)

core-java/src/test/java/com/baeldung/array/converter/ArrayConvertToListTest.java

@@ -0,0 +1,116 @@
+package com.baeldung.array.converter;
+
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.Assert.*;
+
+public class ArrayConvertToListTest {
+
+    @Test
+    public void givenAnStringArray_whenConvertArrayToList_thenListCreated() {
+        String[] flowers = { "Ageratum", "Allium", "Poppy", "Catmint" };
+        List<String> flowerList = Arrays.asList(flowers);
+
+        assertNotNull(flowerList);
+        assertEquals(flowerList.size(), 4);
+        assertEquals(flowerList.get(0), "Ageratum");
+        assertEquals(flowerList.get(1), "Allium");
+        assertEquals(flowerList.get(2), "Poppy");
+        assertEquals(flowerList.get(3), "Catmint");
+    }
+
+    @Test
+    public void givenAnIntArray_whenConvertArrayToList_thenListWithOneElementCreated() {
+        int[] primitives = { 1, 2, 3, 4 };
+        List numbers = Arrays.asList(primitives);
+
+        assertNotNull(numbers);
+        assertEquals(numbers.size(), 1);
+        assertEquals(numbers.get(0), primitives);
+    }
+
+    @Test(expected = UnsupportedOperationException.class)
+    public void givenAnStringArray_whenConvertArrayToListAndAddAnElement_thenThrowUnsupportedOperationException() {
+        String[] flowers = { "Ageratum", "Allium", "Poppy", "Catmint" };
+        List<String> flowerList = Arrays.asList(flowers);
+
+        assertNotNull(flowerList);
+        assertEquals(flowerList.size(), 4);
+        assertEquals(flowerList.get(0), "Ageratum");
+        assertEquals(flowerList.get(1), "Allium");
+        assertEquals(flowerList.get(2), "Poppy");
+        assertEquals(flowerList.get(3), "Catmint");
+
+        flowerList.add("Celosia");
+    }
+
+    @Test(expected = UnsupportedOperationException.class)
+    public void givenAnStringArray_whenConvertArrayToListAndRemoveAnElement_thenThrowUnsupportedOperationException() {
+        String[] flowers = { "Ageratum", "Allium", "Poppy", "Catmint" };
+        List<String> flowerList = Arrays.asList(flowers);
+
+        assertNotNull(flowerList);
+        assertEquals(flowerList.size(), 4);
+        assertEquals(flowerList.get(0), "Ageratum");
+        assertEquals(flowerList.get(1), "Allium");
+        assertEquals(flowerList.get(2), "Poppy");
+        assertEquals(flowerList.get(3), "Catmint");
+
+        flowerList.remove("Poppy");
+    }
+
+    @Test
+    public void givenAnStringArray_whenCreateListFromArrayAndAddAnElement_thenListOk() {
+        String[] flowers = { "Ageratum", "Allium", "Poppy", "Catmint" };
+        List<String> flowerList = Arrays.asList(flowers);
+
+        assertNotNull(flowerList);
+        assertEquals(flowerList.size(), 4);
+
+        assertEquals(flowerList.get(0), "Ageratum");
+        assertEquals(flowerList.get(1), "Allium");
+        assertEquals(flowerList.get(2), "Poppy");
+        assertEquals(flowerList.get(3), "Catmint");
+
+        List<String> newflowerList = new ArrayList<>(flowerList);
+
+        assertNotNull(newflowerList);
+        assertEquals(newflowerList.size(), 4);
+        assertEquals(newflowerList.get(0), "Ageratum");
+        assertEquals(newflowerList.get(1), "Allium");
+        assertEquals(newflowerList.get(2), "Poppy");
+        assertEquals(newflowerList.get(3), "Catmint");
+
+        newflowerList.add("Celosia");
+
+        assertEquals(newflowerList.size(), 5);
+        assertEquals(newflowerList.get(4), "Celosia");
+    }
+
+    @Test
+    public void givenAnStringArray_whenIterateArrayAndAddTheElementsToNewListAndAddAnElement_thenListOk() {
+        String[] flowers = { "Ageratum", "Allium", "Poppy", "Catmint" };
+
+        List<String> flowerList = new ArrayList<>();
+        for(String flower: flowers) {
+            flowerList.add(flower);
+        }
+
+        assertNotNull(flowerList);
+        assertEquals(flowerList.size(), 4);
+
+        assertEquals(flowerList.get(0), "Ageratum");
+        assertEquals(flowerList.get(1), "Allium");
+        assertEquals(flowerList.get(2), "Poppy");
+        assertEquals(flowerList.get(3), "Catmint");
+
+        flowerList.add("Celosia");
+
+        assertEquals(flowerList.size(), 5);
+        assertEquals(flowerList.get(4), "Celosia");
+    }
+}