chore(tests): mock static query

src/components/Sidebar/Author/Author.test.tsx

@@ -1,10 +1,18 @@
 import React from "react";
 import renderer from "react-test-renderer";
 
+import { StaticQuery } from "gatsby";
+
 import { Author } from "@/components/Sidebar/Author";
 import * as mocks from "@/mocks";
 
+const mockedStaticQuery = StaticQuery as jest.Mock;
+
 describe("Author", () => {
+  beforeEach(() => {
+    mockedStaticQuery.mockImplementationOnce(() => null);
+  });
+
   it("renders correctly", () => {
     const props = { isIndex: false, author: mocks.author };
     const tree = renderer.create(<Author {...props} />).toJSON();