Create test for RemarkCommand

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

@@ -0,0 +1,40 @@
+package seedu.address.logic.commands;
+
+import static seedu.address.logic.commands.CommandTestUtil.assertCommandSuccess;
+import static seedu.address.testutil.TypicalIndexes.INDEX_FIRST_PERSON;
+import static seedu.address.testutil.TypicalPersons.getTypicalAddressBook;
+
+import org.junit.jupiter.api.Test;
+
+import seedu.address.model.AddressBook;
+import seedu.address.model.Model;
+import seedu.address.model.ModelManager;
+import seedu.address.model.UserPrefs;
+import seedu.address.model.person.Person;
+import seedu.address.model.person.Remark;
+import seedu.address.testutil.PersonBuilder;
+
+/**
+ * Contains integration tests (interaction with the Model) and unit tests for RemarkCommand.
+ */
+public class RemarkCommandTest {
+
+    private static final String REMARK_STUB = "Some remark";
+
+    private Model model = new ModelManager(getTypicalAddressBook(), new UserPrefs());
+
+    @Test
+    public void execute_addRemarkUnfilteredList_success() {
+        Person firstPerson = model.getFilteredPersonList().get(INDEX_FIRST_PERSON.getZeroBased());
+        Person editedPerson = new PersonBuilder(firstPerson).withRemark(REMARK_STUB).build();
+
+        RemarkCommand remarkCommand = new RemarkCommand(INDEX_FIRST_PERSON, new Remark(editedPerson.getRemark().value));
+
+        String expectedMessage = String.format(RemarkCommand.MESSAGE_ADD_REMARK_SUCCESS, editedPerson);
+
+        Model expectedModel = new ModelManager(new AddressBook(model.getAddressBook()), new UserPrefs());
+        expectedModel.setPerson(firstPerson, editedPerson);
+
+        assertCommandSuccess(remarkCommand, model, expectedMessage, expectedModel);
+    }
+}