chart-app/src/test/java/com/example/widgets/WidgetRegistryTest.java

package com.example.widgets;

import com.example.data.InMemoryChartDataService;
import org.junit.jupiter.api.Test;

import java.util.List;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;

/**
 * The definitions themselves — the factories need a Vaadin UI to resolve
 * translations, so they are exercised from {@code DashboardViewTest} instead.
 */
class WidgetRegistryTest {

    private final WidgetRegistry registry = new WidgetRegistry(new InMemoryChartDataService());

    @Test
    void definitions_areListedInRegistrationOrder() {
        List<String> types = registry.definitions().stream()
                .map(WidgetDefinition::type).toList();

        assertEquals(List.of(WidgetRegistry.REVENUE_TREND, WidgetRegistry.REVENUE_MONTH,
                WidgetRegistry.REVENUE_REGION), types);
        assertTrue(registry.definitions().stream()
                        .allMatch(d -> d.width() > 0 && d.height() > 0),
                "every definition carries a usable default size");
    }

    @Test
    void require_rejectsAnUnknownType() {
        assertThrows(IllegalArgumentException.class, () -> registry.require("nope"));
    }

    @Test
    void register_replacesTheDefinitionOfTheSameType() {
        int before = registry.definitions().size();
        WidgetDefinition replacement = new WidgetDefinition(WidgetRegistry.REVENUE_TREND,
                "card.revenueTrend", 2, 2, context -> null);

        registry.register(replacement);

        assertEquals(before, registry.definitions().size());
        assertEquals(replacement, registry.require(WidgetRegistry.REVENUE_TREND));
    }
}