Enable arrow-body-style rule (#9918)

tests_integration/__tests__/config-resolution.js

@@ -79,11 +79,10 @@ describe("CLI overrides take precedence", () => {
   });
 });
 
-test("API resolveConfig with no args", () => {
-  return prettier.resolveConfig().then((result) => {
+test("API resolveConfig with no args", () =>
+  prettier.resolveConfig().then((result) => {
     expect(result).toEqual({});
-  });
-});
+  }));
 
 test("API resolveConfig.sync with no args", () => {
   expect(prettier.resolveConfig.sync()).toEqual({});