Add test for replacing reference links within a doc

v1/lib/server/__tests__/__fixtures__/doc3.md

@@ -0,0 +1,36 @@
+---
+id: doc3
+title: Document 3
+---
+
+### Existing Docs
+
+- [doc1][doc1]
+- [doc2][doc2]
+
+### Non-existing Docs
+
+- [hahaha][hahaha]
+
+## Repeating Docs
+
+- [doc1][doc1]
+- [doc2][doc2]
+
+## Do not replace this
+```md
+![image1][image1]
+```
+
+```js
+const doc1 = foo();
+console.log("[image2][image2]");
+const testStr = `![image3][image3]`;
+```
+
+[doc1]: doc1.md
+[doc2]: ./doc2.md
+[hahaha]: hahaha.md
+[image1]: assets/image1.png
+[image2]: assets/image2.jpg
+[image3]: assets/image3.gif

v1/lib/server/__tests__/__snapshots__/docs.test.js.snap

@@ -48,6 +48,42 @@ const testStr = \`![image3](assets/image3.gif)\`;
 \`\`\`"
 `;
 
+exports[`mdToHtmlify transforms reference links 1`] = `
+"
+### Existing Docs
+
+- [doc1][doc1]
+- [doc2][doc2]
+
+### Non-existing Docs
+
+- [hahaha][hahaha]
+
+## Repeating Docs
+
+- [doc1][doc1]
+- [doc2][doc2]
+
+## Do not replace this
+\`\`\`md
+![image1][image1]
+\`\`\`
+
+\`\`\`js
+const doc1 = foo();
+console.log(\\"[image2][image2]\\");
+const testStr = \`![image3][image3]\`;
+\`\`\`
+
+[doc1]: /docs/en/next/doc1
+[doc2]: /docs/en/next/doc2
+[hahaha]: hahaha.md
+[image1]: assets/image1.png
+[image2]: assets/image2.jpg
+[image3]: assets/image3.gif
+"
+`;
+
 exports[`replaceAssetsLink does not transform document without valid assets link 1`] = `
 "
 ### Existing Docs

v1/lib/server/__tests__/docs.test.js

@@ -50,8 +50,14 @@ const doc2 = fs.readFileSync(
   'utf8',
 );
 
+const doc3 = fs.readFileSync(
+  path.join(__dirname, '__fixtures__', 'doc3.md'),
+  'utf8',
+);
+
 const rawContent1 = metadataUtils.extractMetadata(doc1).rawContent;
 const rawContent2 = metadataUtils.extractMetadata(doc2).rawContent;
+const rawContent3 = metadataUtils.extractMetadata(doc3).rawContent;
 
 describe('mdToHtmlify', () => {
   const mdToHtml = metadataUtils.mdToHtml(Metadata, '/');
@@ -77,6 +83,17 @@ describe('mdToHtmlify', () => {
     expect(content2).toMatchSnapshot();
     expect(content2).not.toEqual(rawContent2);
   });
+
+  test('transforms reference links', () => {
+    const content3 = docs.mdToHtmlify(
+      rawContent3,
+      mdToHtml,
+      Metadata['en-doc3'],
+    );
+    expect(content3).toContain('/docs/en/next/');
+    expect(content3).toMatchSnapshot();
+    expect(content3).not.toEqual(rawContent3);
+  })
 });
 
 describe('getFile', () => {