Fix warning on test (#7566)

tests_integration/__tests__/format.js

@@ -62,5 +62,7 @@ test("should work with foo plugin instance", () => {
 
 test("'Adjacent JSX' error should not be swallowed by Babel's error recovery", () => {
   const input = "<a></a>\n<b></b>";
-  expect(() => prettier.format(input)).toThrowErrorMatchingSnapshot();
+  expect(() =>
+    prettier.format(input, { parser: "babel" })
+  ).toThrowErrorMatchingSnapshot();
 });