diff --git a/packages/docusaurus-mdx-loader/src/remark/toc/__tests__/fixtures/empty-headings.md b/packages/docusaurus-mdx-loader/src/remark/toc/__tests__/__fixtures__/empty-headings.md
similarity index 100%
rename from packages/docusaurus-mdx-loader/src/remark/toc/__tests__/fixtures/empty-headings.md
rename to packages/docusaurus-mdx-loader/src/remark/toc/__tests__/__fixtures__/empty-headings.md
diff --git a/packages/docusaurus-mdx-loader/src/remark/toc/__tests__/fixtures/inline-code.md b/packages/docusaurus-mdx-loader/src/remark/toc/__tests__/__fixtures__/inline-code.md
similarity index 100%
rename from packages/docusaurus-mdx-loader/src/remark/toc/__tests__/fixtures/inline-code.md
rename to packages/docusaurus-mdx-loader/src/remark/toc/__tests__/__fixtures__/inline-code.md
diff --git a/packages/docusaurus-mdx-loader/src/remark/toc/__tests__/fixtures/insert-below-imports.md b/packages/docusaurus-mdx-loader/src/remark/toc/__tests__/__fixtures__/insert-below-imports.md
similarity index 100%
rename from packages/docusaurus-mdx-loader/src/remark/toc/__tests__/fixtures/insert-below-imports.md
rename to packages/docusaurus-mdx-loader/src/remark/toc/__tests__/__fixtures__/insert-below-imports.md
diff --git a/packages/docusaurus-mdx-loader/src/remark/toc/__tests__/fixtures/just-content.md b/packages/docusaurus-mdx-loader/src/remark/toc/__tests__/__fixtures__/just-content.md
similarity index 100%
rename from packages/docusaurus-mdx-loader/src/remark/toc/__tests__/fixtures/just-content.md
rename to packages/docusaurus-mdx-loader/src/remark/toc/__tests__/__fixtures__/just-content.md
diff --git a/packages/docusaurus-mdx-loader/src/remark/toc/__tests__/fixtures/name-exist.md b/packages/docusaurus-mdx-loader/src/remark/toc/__tests__/__fixtures__/name-exist.md
similarity index 100%
rename from packages/docusaurus-mdx-loader/src/remark/toc/__tests__/fixtures/name-exist.md
rename to packages/docusaurus-mdx-loader/src/remark/toc/__tests__/__fixtures__/name-exist.md
diff --git a/packages/docusaurus-mdx-loader/src/remark/toc/__tests__/fixtures/non-text-content.md b/packages/docusaurus-mdx-loader/src/remark/toc/__tests__/__fixtures__/non-text-content.md
similarity index 100%
rename from packages/docusaurus-mdx-loader/src/remark/toc/__tests__/fixtures/non-text-content.md
rename to packages/docusaurus-mdx-loader/src/remark/toc/__tests__/__fixtures__/non-text-content.md
diff --git a/packages/docusaurus-mdx-loader/src/remark/toc/__tests__/index.test.ts b/packages/docusaurus-mdx-loader/src/remark/toc/__tests__/index.test.ts
index dd786b95ad..53014375fa 100644
--- a/packages/docusaurus-mdx-loader/src/remark/toc/__tests__/index.test.ts
+++ b/packages/docusaurus-mdx-loader/src/remark/toc/__tests__/index.test.ts
@@ -13,7 +13,7 @@ import plugin from '../index';
 import headings from '../../headings/index';
 
 const processFixture = async (name, options?) => {
-  const path = join(__dirname, 'fixtures', `${name}.md`);
+  const path = join(__dirname, '__fixtures__', `${name}.md`);
   const file = await vfile.read(path);
   const result = await remark()
     .use(headings)
diff --git a/packages/docusaurus-mdx-loader/src/remark/unwrapMdxCodeBlocks/__tests__/fixtures/has-mdx-code-blocks.mdx b/packages/docusaurus-mdx-loader/src/remark/unwrapMdxCodeBlocks/__tests__/__fixtures__/has-mdx-code-blocks.mdx
similarity index 100%
rename from packages/docusaurus-mdx-loader/src/remark/unwrapMdxCodeBlocks/__tests__/fixtures/has-mdx-code-blocks.mdx
rename to packages/docusaurus-mdx-loader/src/remark/unwrapMdxCodeBlocks/__tests__/__fixtures__/has-mdx-code-blocks.mdx
diff --git a/packages/docusaurus-mdx-loader/src/remark/unwrapMdxCodeBlocks/__tests__/index.test.ts b/packages/docusaurus-mdx-loader/src/remark/unwrapMdxCodeBlocks/__tests__/index.test.ts
index 99d3669154..fa49602667 100644
--- a/packages/docusaurus-mdx-loader/src/remark/unwrapMdxCodeBlocks/__tests__/index.test.ts
+++ b/packages/docusaurus-mdx-loader/src/remark/unwrapMdxCodeBlocks/__tests__/index.test.ts
@@ -12,14 +12,14 @@ import vfile from 'to-vfile';
 import plugin from '..';
 
 const processFixture = async (name) => {
-  const path = join(__dirname, 'fixtures', name);
+  const path = join(__dirname, '__fixtures__', name);
   const file = await vfile.read(path);
   const result = await remark().use(mdx).use(plugin).process(file);
   return result.toString();
 };
 
 const processFixtureAST = async (name) => {
-  const path = join(__dirname, 'fixtures', name);
+  const path = join(__dirname, '__fixtures__', name);
   const file = await vfile.read(path);
   return remark().use(mdx).use(plugin).parse(file);
 };
diff --git a/packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/fixtures/import-tabs-above.md b/packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/__fixtures__/import-tabs-above.md
similarity index 100%
rename from packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/fixtures/import-tabs-above.md
rename to packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/__fixtures__/import-tabs-above.md
diff --git a/packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/fixtures/import-tabs-below.md b/packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/__fixtures__/import-tabs-below.md
similarity index 100%
rename from packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/fixtures/import-tabs-below.md
rename to packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/__fixtures__/import-tabs-below.md
diff --git a/packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/fixtures/installation.md b/packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/__fixtures__/installation.md
similarity index 100%
rename from packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/fixtures/installation.md
rename to packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/__fixtures__/installation.md
diff --git a/packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/fixtures/plugin.md b/packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/__fixtures__/plugin.md
similarity index 100%
rename from packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/fixtures/plugin.md
rename to packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/__fixtures__/plugin.md
diff --git a/packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/fixtures/syntax-not-properly-set.md b/packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/__fixtures__/syntax-not-properly-set.md
similarity index 100%
rename from packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/fixtures/syntax-not-properly-set.md
rename to packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/__fixtures__/syntax-not-properly-set.md
diff --git a/packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/index.test.ts b/packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/index.test.ts
index 3fe327238a..ef1c4c84b8 100644
--- a/packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/index.test.ts
+++ b/packages/docusaurus-remark-plugin-npm2yarn/src/__tests__/index.test.ts
@@ -14,7 +14,7 @@ import path from 'path';
 import mdx from 'remark-mdx';
 
 const processFixture = async (name: string, options?: {sync?: boolean}) => {
-  const filePath = path.join(__dirname, 'fixtures', `${name}.md`);
+  const filePath = path.join(__dirname, '__fixtures__', `${name}.md`);
   const file = await vfile.read(filePath);
   const result = await remark()
     .use(mdx)
diff --git a/packages/docusaurus/src/server/versions/__tests/index.test.ts b/packages/docusaurus/src/server/versions/__tests__/index.test.ts
similarity index 100%
rename from packages/docusaurus/src/server/versions/__tests/index.test.ts
rename to packages/docusaurus/src/server/versions/__tests__/index.test.ts