JavaAdventureRepo/test/cz/davza/studentadventure/commands/ConsumeCommandTest.java

package cz.davza.studentadventure.commands;

import cz.davza.studentadventure.Items.Book;
import cz.davza.studentadventure.Items.EnergyDrink;
import cz.davza.studentadventure.TestHelpers;
import cz.davza.studentadventure.enums.CommandState;
import cz.davza.studentadventure.objects.CommandResult;
import cz.davza.studentadventure.objects.GameData;
import cz.davza.studentadventure.objects.Player;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import static cz.davza.studentadventure.TestHelpers.execute;
import static org.junit.jupiter.api.Assertions.*;

class ConsumeCommandTest {

    private GameData context;
    private Player player;

    @BeforeEach
    void setUp() {
        context = TestHelpers.buildGameData();
        player  = context.getPlayer();
        player.getInventory().Add(new EnergyDrink(), 2);
    }

    @Test
    void consumeAppliesItemEffect() {
        player.getEnergy().decrease(50);
        int before = player.getEnergy().getValue();
        execute("consume energy_drink", context);
        assertEquals(before + EnergyDrink.ENERGY_RESTORE, player.getEnergy().getValue());
    }

    @Test
    void consumeRemovesOneFromStack() {
        execute("consume energy_drink", context);
        assertEquals(1, player.getInventory().GetByItemCode("energy_drink").getAmount());
    }

    @Test
    void consumeLastItemClearsInventoryEntry() {
        player.getInventory().Add(new EnergyDrink(), 1);
        // inventory has 2 from setUp + 1 = 3 total
        execute("consume energy_drink", context);
        execute("consume energy_drink", context);
        execute("consume energy_drink", context);
        assertNull(player.getInventory().GetByItemCode("energy_drink"));
    }

    @Test
    void consumeRestoresInventoryCapacity() {
        int before = player.getInventory().GetRemainingCapacity();
        execute("consume energy_drink", context);
        assertEquals(before + new EnergyDrink().getBulk(),
                player.getInventory().GetRemainingCapacity());
    }

    @Test
    void consumeReturnsSuccessState() {
        CommandResult result = execute("consume energy_drink", context);
        assertEquals(CommandState.SUCCESS, result.getResultState());
    }

    @Test
    void consumeItemNotInInventoryReturnsItemNotFound() {
        CommandResult result = execute("consume mouldy_cheese", context);
        assertEquals(CommandState.ITEM_NOT_FOUND, result.getResultState());
    }

    @Test
    void consumeNonConsumableReturnsFailed() {
        player.getInventory().Add(new Book(), 1);
        CommandResult result = execute("consume book", context);
        assertEquals(CommandState.FAILED, result.getResultState());
    }

    @Test
    void consumeWithNoParamsReturnsInvalidParams() {
        CommandResult result = execute("consume", context);
        assertEquals(CommandState.INVALID_PARAMS, result.getResultState());
    }

    @Test
    void consumeEnergyCappsAt100() {
        // energy already at 100 — drink shouldn't push above 100
        execute("consume energy_drink", context);
        assertEquals(100, player.getEnergy().getValue());
    }
}