Update ThemeCommandTest

src/test/java/seedu/address/logic/commands/ThemeCommandTest.java

@@ -1,5 +1,7 @@
 package seedu.address.logic.commands;
 
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 import static seedu.address.logic.commands.CommandTestUtil.assertCommandSuccess;
 import static seedu.address.logic.commands.ThemeCommand.MESSAGE_SUCCESS;
 
@@ -37,6 +39,29 @@ public void execute_mutlipleThemes_success() {
         assertCommandSuccess(new ThemeCommand(true), model, expectedLightCommandResult, expectedModel);
     }
 
+    @Test
+    public void equals() {
+
+        boolean isLightTheme = true;
+        boolean isNotLightTheme = false;
+
+        ThemeCommand firstCommand = new ThemeCommand(isLightTheme);
+        ThemeCommand secondCommand = new ThemeCommand(isNotLightTheme);
+
+        // same object -> returns true
+        assertTrue(firstCommand.equals(firstCommand));
+
+        // same values -> returns true
+        ThemeCommand firstCommandCopy = new ThemeCommand(isLightTheme);
+        assertTrue(firstCommand.equals(firstCommandCopy));
+
+        // null -> returns false
+        assertFalse(firstCommand.equals(null));
+
+        // different sort commands -> returns false
+        assertFalse(firstCommand.equals(secondCommand));
+    }
+
 
 
 }