feat(tests): add comprehensive tests for utility functions and blog context

src/shared/utils.test.ts

@@ -0,0 +1,141 @@
+import { describe, expect, it } from 'vitest';
+import {
+  calculateReadingTime,
+  formatDate,
+  formatDateTime,
+  kmpSearch,
+  pluralize,
+} from './utils';
+
+describe('calculateReadingTime', () => {
+  it('should calculate reading time for normal content', () => {
+    const content = 'This is a test content with exactly twenty words in it to test the reading time calculation function properly.';
+    expect(calculateReadingTime(content)).toBe(1);
+  });
+
+  it('should round up to nearest minute', () => {
+    const content = Array.from({ length: 201 }).fill('word').join(' '); // 201 words
+    expect(calculateReadingTime(content)).toBe(2);
+  });
+
+  it('should handle empty string', () => {
+    expect(calculateReadingTime('')).toBe(0);
+  });
+
+  it('should handle single word', () => {
+    expect(calculateReadingTime('word')).toBe(1);
+  });
+
+  it('should handle multiple spaces', () => {
+    expect(calculateReadingTime('word1    word2     word3')).toBe(1);
+  });
+});
+
+describe('formatDate', () => {
+  it('should format date correctly', () => {
+    const result = formatDate('2023-04-09T12:00:00Z');
+    expect(result).toMatch(/^\d{1,2} [А-Я][а-я]{2}$/);
+  });
+
+  it('should handle different date formats', () => {
+    const result = formatDate('2023-12-25');
+    expect(result).toMatch(/^\d{1,2} [А-Я][а-я]{2}$/);
+  });
+
+  it('should capitalize first letter of month', () => {
+    const result = formatDate('2023-01-01T00:00:00Z');
+    expect(result.charAt(result.indexOf(' ') + 1)).toMatch(/[А-Я]/);
+  });
+});
+
+describe('formatDateTime', () => {
+  it('should format datetime correctly', () => {
+    const result = formatDateTime('2023-04-09T15:30:00Z');
+    expect(result).toMatch(/^\d{1,2}\.\d{1,2}\.\d{4} в \d{2}:\d{2}$/);
+  });
+
+  it('should handle different timezones', () => {
+    const result = formatDateTime('2023-12-25T23:59:59Z');
+    expect(result).toContain(' в ');
+    expect(result).toMatch(/:\d{2}$/);
+  });
+});
+
+describe('pluralize', () => {
+  const forms = ['яблоко', 'яблока', 'яблок'];
+
+  it('should return singular form for 1', () => {
+    expect(pluralize(1, forms)).toBe('яблоко');
+  });
+
+  it('should return plural form for 2-4', () => {
+    expect(pluralize(2, forms)).toBe('яблока');
+    expect(pluralize(3, forms)).toBe('яблока');
+    expect(pluralize(4, forms)).toBe('яблока');
+  });
+
+  it('should return genitive form for 0', () => {
+    expect(pluralize(0, forms)).toBe('яблок');
+  });
+
+  it('should return genitive form for 5 and above', () => {
+    expect(pluralize(5, forms)).toBe('яблок');
+    expect(pluralize(10, forms)).toBe('яблок');
+    expect(pluralize(100, forms)).toBe('яблок');
+  });
+
+  it('should handle large numbers', () => {
+    expect(pluralize(1000, forms)).toBe('яблок');
+  });
+});
+
+describe('kmpSearch', () => {
+  it('should find exact match', () => {
+    expect(kmpSearch('hello world', 'world')).toBe(true);
+    expect(kmpSearch('hello world', 'hello')).toBe(true);
+  });
+
+  it('should be case insensitive', () => {
+    expect(kmpSearch('Hello World', 'WORLD')).toBe(true);
+    expect(kmpSearch('HELLO WORLD', 'hello')).toBe(true);
+  });
+
+  it('should return false for non-matching patterns', () => {
+    expect(kmpSearch('hello world', 'foo')).toBe(false);
+    expect(kmpSearch('hello world', 'worlds')).toBe(false);
+  });
+
+  it('should handle empty pattern', () => {
+    expect(kmpSearch('hello world', '')).toBe(true);
+  });
+
+  it('should handle empty text', () => {
+    expect(kmpSearch('', 'pattern')).toBe(false);
+  });
+
+  it('should handle both empty', () => {
+    expect(kmpSearch('', '')).toBe(true);
+  });
+
+  it('should find pattern at the beginning', () => {
+    expect(kmpSearch('pattern text', 'pattern')).toBe(true);
+  });
+
+  it('should find pattern at the end', () => {
+    expect(kmpSearch('some text pattern', 'pattern')).toBe(true);
+  });
+
+  it('should handle overlapping patterns', () => {
+    expect(kmpSearch('ababab', 'abab')).toBe(true);
+  });
+
+  it('should handle complex patterns', () => {
+    expect(kmpSearch('ABABACABABAB', 'ABABAC')).toBe(true);
+    expect(kmpSearch('ABABACABABAB', 'ABABAD')).toBe(false);
+  });
+
+  it('should handle single character patterns', () => {
+    expect(kmpSearch('hello', 'e')).toBe(true);
+    expect(kmpSearch('hello', 'x')).toBe(false);
+  });
+});

src/shared/utils.ts

@@ -10,6 +10,9 @@
  * console.log(time); // Outputs: 1
  */
 export function calculateReadingTime(content: string) {
+  if (!content || content.trim().length === 0)
+    return 0;
+
   const wordsPerMinute = 200;
   const words = content.split(/\s+/).length;
 

src/widgets/Blog/__tests__/context.test.ts

@@ -0,0 +1,179 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { nextTick } from 'vue';
+import { useProvidingPosts } from '../context';
+
+const mockPosts = [
+  {
+    id: 1,
+    title: 'Vue.js Best Practices',
+    content: 'Content about Vue.js',
+    tags: ['vue', 'javascript', 'frontend'],
+    comments: [
+      { id: 1, postId: 1, content: 'Great post!', author: 'John' },
+    ],
+  },
+  {
+    id: 2,
+    title: 'TypeScript Tips',
+    content: 'Content about TypeScript',
+    tags: ['typescript', 'javascript'],
+    comments: [],
+  },
+  {
+    id: 3,
+    title: 'React vs Vue',
+    content: 'Comparison of React and Vue',
+    tags: ['react', 'vue', 'comparison'],
+    comments: [
+      { id: 2, postId: 3, content: 'Interesting comparison', author: 'Jane' },
+    ],
+  },
+];
+
+describe('blog Context', () => {
+  let mockLoader: ReturnType<typeof vi.fn>;
+
+  beforeEach(() => {
+    mockLoader = vi.fn().mockResolvedValue({ data: mockPosts });
+  });
+
+  it('should load posts on initialization', async () => {
+    const context = useProvidingPosts(mockLoader);
+
+    expect(context.loading.value).toBe(true);
+    await nextTick();
+
+    expect(mockLoader).toHaveBeenCalled();
+    expect(context.posts.value).toEqual(mockPosts);
+    expect(context.loading.value).toBe(false);
+  });
+
+  it('should filter posts by search term', async () => {
+    const context = useProvidingPosts(mockLoader);
+    await nextTick();
+
+    context.filters.search = 'Vue';
+    await nextTick();
+
+    expect(context.filteredPosts.value).toHaveLength(2);
+    expect(context.filteredPosts.value.map(p => p.title)).toEqual([
+      'Vue.js Best Practices',
+      'React vs Vue',
+    ]);
+  });
+
+  it('should filter posts by tags', async () => {
+    const context = useProvidingPosts(mockLoader);
+    await nextTick();
+
+    context.filters.tags.add('javascript');
+    await nextTick();
+
+    expect(context.filteredPosts.value).toHaveLength(2);
+    expect(context.filteredPosts.value.map(p => p.title)).toEqual([
+      'Vue.js Best Practices',
+      'TypeScript Tips',
+    ]);
+  });
+
+  it('should filter posts by multiple tags', async () => {
+    const context = useProvidingPosts(mockLoader);
+    await nextTick();
+
+    context.filters.tags.add('vue');
+    context.filters.tags.add('javascript');
+    await nextTick();
+
+    expect(context.filteredPosts.value).toHaveLength(1);
+    expect(context.filteredPosts.value[0].title).toBe('Vue.js Best Practices');
+  });
+
+  it('should combine search and tag filters', async () => {
+    const context = useProvidingPosts(mockLoader);
+    await nextTick();
+
+    context.filters.search = 'Vue';
+    context.filters.tags.add('comparison');
+    await nextTick();
+
+    expect(context.filteredPosts.value).toHaveLength(1);
+    expect(context.filteredPosts.value[0].title).toBe('React vs Vue');
+  });
+
+  it('should toggle tags correctly', async () => {
+    const context = useProvidingPosts(mockLoader);
+    await nextTick();
+
+    expect(context.isTagActive('vue')).toBe(false);
+
+    context.toggleTag('vue');
+    expect(context.isTagActive('vue')).toBe(true);
+
+    context.toggleTag('vue');
+    expect(context.isTagActive('vue')).toBe(false);
+  });
+
+  it('should return available tags from all posts', async () => {
+    const context = useProvidingPosts(mockLoader);
+    await nextTick();
+
+    const expectedTags = ['vue', 'javascript', 'frontend', 'typescript', 'react', 'comparison'];
+    expect(context.availableTags.value.sort()).toEqual(expectedTags.sort());
+  });
+
+  it('should detect when filters are active', async () => {
+    const context = useProvidingPosts(mockLoader);
+    await nextTick();
+
+    expect(context.filtersActive.value).toBe(false);
+
+    context.filters.search = 'test';
+    await nextTick();
+    expect(context.filtersActive.value).toBe(true);
+
+    context.filters.search = '';
+    context.filters.tags.add('vue');
+    await nextTick();
+    expect(context.filtersActive.value).toBe(true);
+  });
+
+  it('should reset filters', async () => {
+    const context = useProvidingPosts(mockLoader);
+    await nextTick();
+
+    context.filters.search = 'test';
+    context.filters.tags.add('vue');
+    context.filters.tags.add('javascript');
+
+    context.resetFilters();
+
+    expect(context.filters.search).toBe('');
+    expect(context.filters.tags.size).toBe(0);
+    expect(context.filtersActive.value).toBe(false);
+  });
+
+  it('should handle loading errors', async () => {
+    const consoleErrorSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
+    const errorLoader = vi.fn().mockRejectedValue(new Error('Failed to load'));
+
+    const context = useProvidingPosts(errorLoader);
+    await nextTick();
+
+    expect(consoleErrorSpy).toHaveBeenCalledWith('Failed to load posts:', expect.any(Error));
+    expect(context.loading.value).toBe(false);
+    expect(context.posts.value).toEqual([]);
+
+    consoleErrorSpy.mockRestore();
+  });
+
+  it('should allow manual reload of posts', async () => {
+    const context = useProvidingPosts(mockLoader);
+    await nextTick();
+
+    mockLoader.mockClear();
+
+    await context.loadPosts();
+
+    expect(mockLoader).toHaveBeenCalled();
+  });
+});

src/widgets/Blog/context.ts

@@ -4,9 +4,9 @@ import { useInjectionStore } from '@robonen/vue';
 import { computed, reactive, ref, shallowRef } from 'vue';
 import { kmpSearch } from '@/shared/utils';
 
-interface PostItem extends Post {
+type PostItem = Post & {
   comments: PostComment[];
-}
+};
 
 export const {
   useProvidingState: useProvidingPosts,
@@ -23,7 +23,7 @@ export const {
   });
 
   const filtersActive = computed(() => {
-    return filters.search || filters.tags.size > 0;
+    return filters.search.trim() !== '' || filters.tags.size > 0;
   });
 
   const filteredPosts = computed(() => {