✅ Add unit tests for FilterPanel component in gamemaster module

code/websites/pokedex.online/tests/unit/components/gamemaster/FilterPanel.test.js

@@ -0,0 +1,104 @@
+/**
+ * FilterPanel Component Tests
+ * Verifies filter UI and interactions
+ */
+
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { mount } from '@vue/test-utils';
+import { ref } from 'vue';
+import FilterPanel from '../../../../src/components/gamemaster/FilterPanel.vue';
+import useJsonFilter from '../../../../src/composables/useJsonFilter.js';
+
+vi.mock('../../../../src/composables/useJsonFilter.js', () => ({
+  default: vi.fn()
+}));
+
+const createFilterMock = overrides => ({
+  filterProperty: ref(''),
+  filterValue: ref(''),
+  filterMode: ref('equals'),
+  availablePaths: ref([]),
+  filterError: ref(null),
+  filterStats: ref({ total: 0, matched: 0, percentage: 0 }),
+  initializeFilter: vi.fn(),
+  extractPathsLazy: vi.fn(),
+  setFilter: vi.fn(),
+  clearFilters: vi.fn(),
+  getUniqueValues: vi.fn(() => []),
+  ...overrides
+});
+
+describe('FilterPanel Component', () => {
+  let filterMock;
+
+  beforeEach(() => {
+    filterMock = createFilterMock();
+    useJsonFilter.mockReturnValue(filterMock);
+  });
+
+  it('renders when data is provided', () => {
+    const wrapper = mount(FilterPanel, {
+      props: { data: [{ id: 1 }] }
+    });
+
+    expect(wrapper.find('.filter-panel').exists()).toBe(true);
+  });
+
+  it('initializes filter on data change', () => {
+    mount(FilterPanel, {
+      props: { data: [{ id: 1 }] }
+    });
+
+    expect(filterMock.initializeFilter).toHaveBeenCalled();
+  });
+
+  it('renders property options', () => {
+    filterMock.availablePaths.value = [
+      { path: 'stats.hp', breadcrumb: 'stats › hp' }
+    ];
+
+    const wrapper = mount(FilterPanel, {
+      props: { data: [{ id: 1 }] }
+    });
+
+    const options = wrapper.findAll('option');
+    expect(options.length).toBeGreaterThan(1);
+    expect(options[1].text()).toContain('stats › hp');
+  });
+
+  it('shows value input when property selected', async () => {
+    filterMock.filterProperty.value = 'stats.hp';
+
+    const wrapper = mount(FilterPanel, {
+      props: { data: [{ id: 1 }] }
+    });
+
+    await wrapper.vm.$nextTick();
+    expect(wrapper.find('#filter-value').exists()).toBe(true);
+  });
+
+  it('applies filter on input change', async () => {
+    filterMock.filterProperty.value = 'stats.hp';
+
+    const wrapper = mount(FilterPanel, {
+      props: { data: [{ id: 1 }] }
+    });
+
+    const input = wrapper.find('#filter-value');
+    await input.setValue('100');
+
+    expect(filterMock.setFilter).toHaveBeenCalled();
+  });
+
+  it('shows stats and error message', () => {
+    filterMock.filterStats.value = { total: 10, matched: 4, percentage: 40 };
+    filterMock.filterError.value = 'Invalid regex';
+
+    const wrapper = mount(FilterPanel, {
+      props: { data: [{ id: 1 }] }
+    });
+
+    expect(wrapper.find('.filter-stats').text()).toContain('4 / 10');
+    expect(wrapper.find('.filter-error').text()).toContain('Invalid regex');
+  });
+});