feat: tie in challenge parser

tools/challenge-md-parser/frontmatter-to-data.test.js

@@ -0,0 +1,62 @@
+/* global describe it expect beforeEach */
+const { isObject } = require('lodash');
+
+const mockAST = require('./fixtures/challenge-md-ast.json');
+const frontmatterToData = require('./frontmatter-to-data');
+
+describe('frontmatter-to-data plugin', () => {
+  const plugin = frontmatterToData();
+  let file = { data: {} };
+  beforeEach(() => {
+    file = { data: {} };
+  });
+
+  it('should return a plugin which is a function', () => {
+    expect(typeof plugin).toEqual('function');
+  });
+
+  it('should maintain an object for the `file.data` property', () => {
+    plugin(mockAST, file);
+    expect(isObject(file.data)).toBe(true);
+  });
+
+  it('should add all keys from frontmatter to the `file.data` property', () => {
+    const expectedKeys = ['id', 'title', 'challengeType', 'videoUrl'];
+    plugin(mockAST, file);
+    const actualKeys = Object.keys(file.data);
+    expect(actualKeys).toEqual(expectedKeys);
+  });
+
+  it('should not mutate any type held in the frontmatter', () => {
+    expect.assertions(4);
+    plugin(mockAST, file);
+    const { id, title, challengeType, videoUrl } = file.data;
+    expect(typeof id).toEqual('string');
+    expect(typeof title).toEqual('string');
+    expect(typeof challengeType).toEqual('number');
+    expect(typeof videoUrl).toEqual('string');
+  });
+
+  it('should trim extra whitespace from keys and values', () => {
+    expect.assertions(7);
+    plugin(mockAST, file);
+    const whitespaceRE = /(^\s\S+|\S\s$)/;
+    const keys = Object.keys(file.data);
+    keys.forEach(key => expect(whitespaceRE.test(key)).toBe(false));
+    const values = keys.map(key => file.data[key]);
+    values
+      .filter(value => typeof value === 'string')
+      .forEach(value => expect(whitespaceRE.test(value)).toBe(false));
+  });
+
+  it('should not mutate url strings', () => {
+    const expectedUrl = 'https://scrimba.com/p/pVMPUv/cE8Gpt2';
+    plugin(mockAST, file);
+    expect(file.data.videoUrl).toEqual(expectedUrl);
+  });
+
+  it('should have an output to match the snapshot', () => {
+    plugin(mockAST, file);
+    expect(file.data).toMatchSnapshot();
+  });
+});