Create DateHandlerTest.java

src/main/java/seedu/wildwatch/operation/DateHandler.java

@@ -3,9 +3,10 @@
 import java.util.regex.Pattern;
 public class DateHandler {
     private static final Pattern DATE_TIME_PATTERN = Pattern.compile(
-            "(0?[1-9]|[1-2][0-9]|3[0-1])-(0?[1-9]|1[0-2])-\\d{2}"   // dd-mm-yy
+            "(0[1-9]|[1-2][0-9]|3[0-1])-(0[1-9]|1[0-2])-\\d{2}"   // dd-mm-yy
     );
     public static boolean isDateValid(String inputBuffer) {
+        //Trims off everything except date
         CharSequence date = inputBuffer.substring(inputBuffer.indexOf("D/") + 2, inputBuffer.indexOf("S/")).trim();
         if (DATE_TIME_PATTERN.matcher(date).matches()) {
             return true;

src/main/java/seedu/wildwatch/operation/ShutDown.java

@@ -2,7 +2,7 @@
 
 public class ShutDown {
     public static void shutDown() {
-        //ChatBot Ending
+        //Program Ending
         Ui.printHorizontalLines();
         System.out.println("Bye. Hope to see you again soon!");
         Ui.printHorizontalLines();

src/test/java/seedu/wildwatch/WildWatchTest.java

@@ -6,7 +6,7 @@
 public class WildWatchTest {
 
     @Test
-    public void isDateValid() {
+    public void isMainValid() {
         assertTrue(true);
     }
 }

src/test/java/seedu/wildwatch/operation/DateHandlerTest.java

@@ -0,0 +1,18 @@
+package seedu.wildwatch.operation;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class DateHandlerTest {
+    @Test
+    public void testDateHandler() {
+        Ui.printHorizontalLines();
+        System.out.println("Testing whether date is valid...");
+        Ui.printHorizontalLines();
+        assertTrue(DateHandler.isDateValid("D/ 09-11-23 S/"));
+        assertFalse(DateHandler.isDateValid("D/9-11-23 S/"));
+        assertFalse(DateHandler.isDateValid("D/ 99-11-23 S/"));
+    }
+}

src/test/java/seedu/wildwatch/operation/ParserTest.java

@@ -0,0 +1,11 @@
+package seedu.wildwatch.operation;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class ParserTest {
+    @Test
+    public void isMainValid() {
+        assertTrue(true);
+    }
+}

src/test/java/seedu/wildwatch/operation/UiTest.java

@@ -7,16 +7,28 @@
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class UiTest {
+    private static final int NUMBER_OF_UNDERSCORES = 60;
+
     @Test
     public void testInputRetriever() {
-        System.out.println("Testing Ui.inputRetriever()");
+        printHorizontalLines();
+        System.out.println("Testing Ui.inputRetriever");
+        printHorizontalLines();
+        System.out.println();
+
         String input = " test input ";
-        InputStream originalSystemIn = System.in;
         try {
             System.setIn(new ByteArrayInputStream(input.getBytes()));
             assertEquals("test input", Ui.inputRetriever());
         } finally {
-            System.setIn(originalSystemIn);
+            System.setIn(System.in);
+        }
+    }
+
+    public static void printHorizontalLines() {
+        for (int i = 0; i < NUMBER_OF_UNDERSCORES; i++) {
+            System.out.print("_");
         }
+        System.out.print(System.lineSeparator());
     }
 }