/
index.spec.ts
183 lines (155 loc) · 5.36 KB
/
index.spec.ts
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import MarkdownIt from 'markdown-it';
import Parser from 'rss-parser';
import * as fs from 'fs';
import { BlogFeedException, WriteFileException, assertType } from './util';
import {
BlogPostsGenerator,
BlogPostsGeneratorConfig,
MarkdownRenderer,
RssParser,
writeToFile,
} from './index';
describe('MarkdownRenderer', () => {
it('returns rendered markdown', () => {
const txt = '## Text';
const rendered = '<h2>Text</h2>\n';
const markdownItInstance = assertType<MarkdownIt>({
render: jest.fn().mockReturnValue(rendered),
use: jest.fn(),
});
const markdownRenderer = new MarkdownRenderer(markdownItInstance);
expect(markdownRenderer.renderMarkdown(txt)).toBe(rendered);
expect(markdownItInstance.render).toHaveBeenCalledWith(txt);
});
});
describe('RssParser', () => {
it('parses blog post items from RSS feed', async () => {
const mockFeed = {
items: [
{
title: 'my title',
link: 'link to blog post',
pubDate: '2022-01-01',
content: 'content of the blog post',
},
],
};
const parserInstance = assertType<Parser>({
parseURL: jest.fn().mockReturnValue(mockFeed),
});
const rssParser = new RssParser(parserInstance);
const url = 'https://example.com';
const result = await rssParser.parseBlogFeedItems(url);
expect(result).toBe(mockFeed.items);
expect(parserInstance.parseURL).toHaveBeenCalledWith(`${url}/index.xml`);
});
it('throws BlogFeedException when parsing fails', async () => {
const error = new Error('Parse error');
const parserInstance = assertType<Parser>({
parseURL: jest.fn().mockRejectedValue(error),
});
const rssParser = new RssParser(parserInstance);
const url = 'https://example.com';
await expect(rssParser.parseBlogFeedItems(url)).rejects.toThrow(
BlogFeedException,
);
expect(parserInstance.parseURL).toHaveBeenCalledWith(`${url}/index.xml`);
});
});
describe('BlogPostGenerator', () => {
const getEmptyFeedItemsParser = (): Parser => assertType<Parser>({
parseURL: jest.fn().mockReturnValue({ items: [] }),
});
const getMockFeedParser = (): Parser => {
const mockFeed = {
items: [
{
title: 'my title',
link: 'https://example.com/blog-post',
pubDate: '2022-01-01',
content: 'content of the blog post',
},
],
};
return assertType<Parser>({
parseURL: jest.fn().mockReturnValue(mockFeed),
});
};
const setup = (parserStrategy: () => Parser) => {
const blogpostsGeneratorConfig = new BlogPostsGeneratorConfig(
{
blogUrl: 'https://example.com',
mastodonUrl: 'mastodon url',
linkedInUrl: 'linkedIn url',
devToUrl: 'dev.to url',
websiteUrl: 'https://mywebsiteurl',
},
1,
'20',
);
const parserInstance = parserStrategy();
const rssParser = new RssParser(parserInstance);
const blogPostsGenerator = new BlogPostsGenerator(
blogpostsGeneratorConfig,
rssParser,
);
return { blogPostsGenerator };
};
it('throws an exception when it fails', async () => {
const { blogPostsGenerator } = setup(getEmptyFeedItemsParser);
await expect(blogPostsGenerator.generateMdText()).rejects.toThrow(
new BlogFeedException('Empty array is not allowed as input'),
);
});
it('generates markdown from blog posts', async () => {
const { blogPostsGenerator } = setup(getMockFeedParser);
const result = await blogPostsGenerator.generateMdText();
expect(result).toEqual(expect.stringContaining('# Hi. :wave'));
expect(result).toEqual(
expect.stringContaining(
'<img src="https://img.shields.io/badge/mastodon-6364FF.svg?&style=for-the-badge&logo=mastodon&logoColor=white" height=20>',
),
);
expect(result).toEqual(
expect.stringContaining(
'<img src="https://img.shields.io/badge/linkedin-0077B5.svg?&style=for-the-badge&logo=linkedin&logoColor=white" height=20>',
),
);
expect(result).toEqual(
expect.stringContaining(
'<img src="https://img.shields.io/badge/DEV.TO-0A0A0A.svg?&style=for-the-badge&logo=dev-dot-to&logoColor=white" height=20>',
),
);
expect(result).toEqual(
expect.stringContaining(
'<a href=https://example.com>:arrow_right: More blog posts</a>',
),
);
expect(result).toEqual(
expect.stringContaining(
`<ul>
<li><a href="https://example.com/blog-post">my title</a> — 2022-01-01</li>
</ul>`,
),
);
});
});
describe('writeToFile', () => {
it('successfully writes to a file', async () => {
jest.spyOn(fs.promises, 'writeFile').mockResolvedValue();
const filename = 'test.txt';
const content = 'This is a test content';
await expect(writeToFile(filename, content)).resolves.not.toThrow();
expect(fs.promises.writeFile).toHaveBeenCalledWith(filename, content);
});
it('throws WriteFileException if writeFile fails', async () => {
const error = new Error('writeFile failed');
jest.spyOn(fs.promises, 'writeFile').mockRejectedValue(error);
const filename = 'test.txt';
const content = 'This is a test content';
await expect(writeToFile(filename, content)).rejects.toThrow(
new WriteFileException(error),
);
expect(fs.promises.writeFile).toHaveBeenCalledWith(filename, content);
});
});