Add testcases for FindGroup and ListGroup

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

@@ -0,0 +1,95 @@
+package seedu.address.logic.commands;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static seedu.address.testutil.Assert.assertThrows;
+import static seedu.address.testutil.TypicalPersons.getTypicalAddressBook;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.function.Predicate;
+
+import org.junit.jupiter.api.Test;
+
+import seedu.address.logic.Messages;
+import seedu.address.logic.commands.exceptions.CommandException;
+import seedu.address.model.Model;
+import seedu.address.model.ModelManager;
+import seedu.address.model.UserPrefs;
+import seedu.address.model.group.Group;
+import seedu.address.model.person.NameContainsKeywordsPredicate;
+import seedu.address.model.person.Person;
+import seedu.address.testutil.GroupBuilder;
+
+/**
+ * Contains integration tests (interaction with the Model) for {@code FindCommand}.
+ */
+public class FindGroupCommandTest {
+    private Model model = new ModelManager(getTypicalAddressBook(), new UserPrefs());
+    private Model expectedModel = new ModelManager(getTypicalAddressBook(), new UserPrefs());
+
+    @Test
+    public void equals() {
+        FindGroupCommand findCS2105Command = new FindGroupCommand("CS2105");
+        FindGroupCommand findCS2100Command = new FindGroupCommand("CS2100");
+
+        // same object -> returns true
+        assertTrue(findCS2105Command.equals(findCS2105Command));
+
+        // same values -> returns true
+        FindGroupCommand findCS2105CommandCopy = new FindGroupCommand("CS2105");
+        assertTrue(findCS2105Command.equals(findCS2105CommandCopy));
+
+        // different types -> returns false
+        assertFalse(findCS2105Command.equals(1));
+
+        // null -> returns false
+        assertFalse(findCS2105Command.equals(null));
+
+        // different person -> returns false
+        assertFalse(findCS2105Command.equals(findCS2100Command));
+    }
+
+    @Test
+    public void execute_invalidGroup_failure() {
+        String expectedMessage = String.format(Messages.MESSAGE_NO_GROUP_WITH_NAME_FOUND);
+
+        // empty input
+        String emptyInput = "";
+        assertThrows(CommandException.class, expectedMessage,
+                () -> new FindGroupCommand(emptyInput).execute(model));
+
+        // nonexistent group
+        Group nonexistentGroup = new GroupBuilder().build();
+        FindGroupCommand findGroupCommand =
+                new FindGroupCommand(nonexistentGroup.getGroupName());
+
+        assertThrows(CommandException.class, expectedMessage,
+                () -> findGroupCommand.execute(model));
+
+        assertEquals(expectedModel.getFilteredPersonList(), model.getFilteredPersonList());
+    }
+
+    @Test
+    public void execute_existingGroup_multiplePersonsFound() throws CommandException {
+        Group groupToFind = expectedModel.findGroup("CS2105");
+        Predicate<Person> predicate = p -> p.containsGroup(groupToFind);
+        expectedModel.updateFilteredPersonList(predicate);
+        String expectedMessage = String.format(FindGroupCommand.MESSAGE_GROUP_FOUND,
+                "CS2105", "CS2105 remark");
+
+        CommandResult commandResult = new FindGroupCommand(groupToFind.getGroupName()).execute(model);
+
+        assertEquals(expectedMessage, commandResult.getFeedbackToUser());
+        assertEquals(expectedModel.getFilteredPersonList(), model.getFilteredPersonList());
+    }
+
+    @Test
+    public void toStringMethod() {
+        FindGroupCommand findCS2100Command = new FindGroupCommand("CS2100");
+        String expected = FindGroupCommand.class.getCanonicalName() + "{group name=" + "CS2100" + "}";
+        assertEquals(expected, findCS2100Command.toString());
+    }
+
+}

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

@@ -0,0 +1,32 @@
+package seedu.address.logic.commands;
+
+import org.junit.jupiter.api.Test;
+import seedu.address.model.Model;
+import seedu.address.model.ModelManager;
+import seedu.address.model.UserPrefs;
+
+import static seedu.address.logic.commands.CommandTestUtil.assertCommandSuccess;
+import static seedu.address.testutil.TypicalPersons.getTypicalAddressBook;
+
+public class ListGroupCommandTest {
+    private Model model;
+    private Model expectedModel;
+
+    @Test
+    public void execute_typicalAddressBook_success() {
+        model = new ModelManager(getTypicalAddressBook(), new UserPrefs());
+        expectedModel = new ModelManager(model.getAddressBook(), new UserPrefs());
+        String expectedMessage = "Groups in address book:\n" + "CS2105\n";
+
+        assertCommandSuccess(new ListGroupCommand(), model, expectedMessage, expectedModel);
+    }
+
+    @Test
+    public void execute_emptyAddressBook_success() {
+        Model model = new ModelManager();
+        Model expectedModel = new ModelManager();
+        String expectedMessage = "Groups in address book:\n";
+
+        assertCommandSuccess(new ListGroupCommand(), model, expectedMessage, expectedModel);
+    }
+}