feat(challenge-md): Parse seed files from md

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

@@ -0,0 +1,59 @@
+/* global describe it expect beforeEach */
+const mockAST = require('./fixtures/challenge-html-ast.json');
+const challengeSeedToData = require('./challengeSeed-to-data');
+
+describe('challengeSeed-to-data plugin', () => {
+  const plugin = challengeSeedToData();
+  let file = { data: {} };
+
+  beforeEach(() => {
+    file = { data: {} };
+  });
+
+  it('returns a function', () => {
+    expect(typeof plugin).toEqual('function');
+  });
+
+  it('adds a `files` property to `file.data`', () => {
+    plugin(mockAST, file);
+    expect('files' in file.data).toBe(true);
+  });
+
+  it('ensures that the `files` property is an array', () => {
+    plugin(mockAST, file);
+    expect(Array.isArray(file.data.files)).toBe(true);
+  });
+
+  it('adds test objects to the files array following a schema', () => {
+    expect.assertions(7);
+    plugin(mockAST, file);
+    const {
+      data: { files }
+    } = file;
+    const testObject = files[0];
+    expect(Object.keys(testObject).length).toEqual(6);
+    expect(testObject).toHaveProperty('key');
+    expect(testObject).toHaveProperty('ext');
+    expect(testObject).toHaveProperty('name');
+    expect(testObject).toHaveProperty('contents');
+    expect(testObject).toHaveProperty('head');
+    expect(testObject).toHaveProperty('tail');
+  });
+
+  it('only adds strings to the `files` object type', () => {
+    expect.assertions(6);
+    plugin(mockAST, file);
+    const {
+      data: { files }
+    } = file;
+    const testObject = files[0];
+    Object.keys(testObject)
+      .map(key => testObject[key])
+      .forEach(value => expect(typeof value).toEqual('string'));
+  });
+
+  it('should have an output to match the snapshot', () => {
+    plugin(mockAST, file);
+    expect(file.data).toMatchSnapshot();
+  });
+});