@@ -0,0 +1,420 @@
+package seedu.todo.commons;%0A%0Aimport org.junit.*;%0Aimport static org.junit.Assert.*;%0A%0Aimport seedu.todo.models.CalendarItem;%0Aimport seedu.todo.models.Event;%0Aimport seedu.todo.models.Task;%0A%0Apublic class EphemeralDBTest %7B%0A    %0A    @Test%0A    public void check_singleton() %7B%0A        EphemeralDB one = EphemeralDB.getInstance();%0A        EphemeralDB two = EphemeralDB.getInstance();%0A        assertEquals(one, two);%0A    %7D%0A    %0A%7D%0A

Test singleton