Add DeadlineTest.java, TodoTest.java & EventTest.java to test behavio…

…r of

code

src/test/java/siri/DeadlineTest.java

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+package siri;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class DeadlineTest {
+    @Test
+    public void stringFormatTest(){
+        assertEquals("[D][ ] CS2103T Quiz 3 (by: May 20th)", new Deadline("CS2103T Quiz 3","D", "May 20th").toString());
+    }
+}

src/test/java/siri/EventTest.java

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+package siri;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class EventTest {
+    @Test
+    public void testStringConversion() {
+        assertEquals("[E][ ] Jane's Wedding (at: Oct 10th 2019)", new Event("Jane's Wedding", "E", "Oct 10th 2019").toString());
+    }
+}

src/test/java/siri/TodoTest.java

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+package siri;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class TodoTest {
+    @Test
+    public void testStringConversion() {
+        assertEquals("[T][ ] run 2.4km", new Todo("run 2.4km", "T").toString());
+    }
+}