test: subdirectory doc file linking

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

@@ -0,0 +1,9 @@
+---
+id: doc3
+title: Document 3
+---
+
+Test subdirectory file
+
+### Replace this
+- [doc3](subdir/doc3.md)

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

@@ -1,5 +1,14 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`mdToHtmlify transform link even in subdirectory 1`] = `
+"
+Test subdirectory file
+
+### Replace this
+- [doc3](/docs/subdir/doc3)
+"
+`;
+
 exports[`mdToHtmlify transform nothing 1`] = `
 "
 Docusaurus is the best :)

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

@@ -50,8 +50,14 @@ const doc2 = fs.readFileSync(
   'utf8',
 );
 
+const doc3 = fs.readFileSync(
+  path.join(__dirname, '__fixtures__', 'subdir', '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 +83,28 @@ describe('mdToHtmlify', () => {
     expect(content2).toMatchSnapshot();
     expect(content2).not.toEqual(rawContent2);
   });
+
+  test('transform link even in subdirectory', () => {
+    const customMetadata = {
+      'subdir-doc3': {
+        id: 'subdir-doc3',
+        title: 'Document 3',
+        source: 'subdir/doc3.md',
+        permalink: 'docs/subdir/doc3.html',
+        language: 'en',
+      },
+    };
+    const customMdToHtml = metadataUtils.mdToHtml(customMetadata, '/');
+    const content3 = docs.mdToHtmlify(
+      rawContent3,
+      customMdToHtml,
+      customMetadata['subdir-doc3'],
+    );
+    expect(content3).toContain('/docs/subdir/doc3');
+    expect(content3).not.toContain('subdir/doc3.md');
+    expect(content3).toMatchSnapshot();
+    expect(content3).not.toEqual(rawContent3);
+  });
 });
 
 describe('getFile', () => {