Add JUnit Tests

src/test/java/DeadlineTest.java

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+import org.junit.jupiter.api.Test;
+
+import java.time.LocalDate;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class DeadlineTest {
+
+    @Test
+    void getStatusIcon() {
+        Deadline deadline = new Deadline("return book /by 2020-12-31", false, LocalDate.parse("2020-12-31"));
+        assertEquals("\u2718", deadline.getStatusIcon()) ;
+    }
+
+}

src/test/java/EventTest.java

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+import org.junit.jupiter.api.Test;
+
+import java.time.LocalDate;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class EventTest {
+
+    @Test
+    void getType() {
+        Event event = new Event("project meeting /at 2020-12-31", false, LocalDate.parse("2020-12-31"));
+        assertEquals("E", event.getType());
+    }
+}

src/test/java/TodoTest.java

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+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class TodoTest {
+
+    @Test
+    void getDescription() {
+        Todo todo = new Todo("read book", false);
+        assertEquals("read book", todo.getDescription());
+    }
+}