Add JUnit test for print list methods

src/test/java/seedu/binbash/ItemListTest.java

@@ -35,5 +35,18 @@ void addItem_itemNameAndDescription_correctItemNameAndDescription() {
         assertEquals(item.getItemDescription(), "A test item");
     }
 
+    @Test
+    void printList_twoItemsInItemList_correctPrintFormatForBothItems() {
+        ItemList itemList = new ItemList();
+
+        itemList.addItem("testItem", "1");
+        itemList.addItem("testItem", "2");
 
+        String actualOutput = itemList.printList();
+
+        String expectedOutput = "testItem: 1" + System.lineSeparator() +
+                "testItem: 2" + System.lineSeparator();
+
+        assertEquals(expectedOutput, actualOutput);
+    }
 }

src/test/java/seedu/binbash/command/ListCommandTest.java

@@ -0,0 +1,26 @@
+package seedu.binbash.command;
+
+import org.junit.jupiter.api.Test;
+import seedu.binbash.ItemList;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class ListCommandTest {
+
+    @Test
+    void execute_listCommandWithTwoItemsInItemList_correctPrintFormatForBothItems() {
+        ItemList itemList = new ItemList();
+
+        itemList.addItem("testItem", "1");
+        itemList.addItem("testItem", "2");
+
+        ListCommand listCommand = new ListCommand(itemList);
+
+        String actualOutput = listCommand.execute();
+
+        String expectedOutput = "testItem: 1" + System.lineSeparator() +
+                "testItem: 2" + System.lineSeparator();
+
+        assertEquals(expectedOutput, actualOutput);
+    }
+}

src/test/java/seedu/binbash/ui/UiTest.java

@@ -29,9 +29,9 @@ public void restoreStreams() {
 
     @Test
     public void testTalk() {
-        String test_line = "this is a test line of text.";
-        ui.talk(test_line);
-        assertEquals(LINE_DIVIDER + System.lineSeparator() + test_line + System.lineSeparator() + LINE_DIVIDER
+        String testLine = "this is a test line of text.";
+        ui.talk(testLine);
+        assertEquals(LINE_DIVIDER + System.lineSeparator() + testLine + System.lineSeparator() + LINE_DIVIDER
                 + System.lineSeparator(), outContent.toString());
     }
 }