diff --git a/tests/config/format-test.js b/tests/config/format-test.js
index 4733d406a0f5..c63db9d586c1 100644
--- a/tests/config/format-test.js
+++ b/tests/config/format-test.js
@@ -55,8 +55,6 @@ const espreeDisabledTests = new Set(
   [
     // These tests only work for `babel`
     "comments-closure-typecast",
-    // Unknown reason https://github.com/babel/babel/pull/14779#discussion_r928137651
-    "strings",
   ].map((directory) => path.join(__dirname, "../format/js", directory))
 );
 const acornDisabledTests = espreeDisabledTests;
diff --git a/tests/format/js/strings/__snapshots__/jsfmt.spec.js.snap b/tests/format/js/strings/__snapshots__/jsfmt.spec.js.snap
index c8f8fd1cc6ab..c69648792f68 100644
--- a/tests/format/js/strings/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/format/js/strings/__snapshots__/jsfmt.spec.js.snap
@@ -65,6 +65,50 @@ const loremIpsumFooBazBar2 =
 ================================================================================
 `;
 
+exports[`non-octal-eight-and-nine.js [acorn] format 1`] = `
+"Invalid escape sequence (3:3)
+  1 | // https://github.com/babel/babel/pull/11852
+  2 |
+> 3 | "\\8","\\9";
+    |   ^
+  4 | () => {
+  5 |   "use strict";
+  6 |   "\\8", "\\9";"
+`;
+
+exports[`non-octal-eight-and-nine.js [espree] format 1`] = `
+"Invalid escape sequence (3:3)
+  1 | // https://github.com/babel/babel/pull/11852
+  2 |
+> 3 | "\\8","\\9";
+    |   ^
+  4 | () => {
+  5 |   "use strict";
+  6 |   "\\8", "\\9";"
+`;
+
+exports[`non-octal-eight-and-nine.js - {"trailingComma":"all"} [acorn] format 1`] = `
+"Invalid escape sequence (3:3)
+  1 | // https://github.com/babel/babel/pull/11852
+  2 |
+> 3 | "\\8","\\9";
+    |   ^
+  4 | () => {
+  5 |   "use strict";
+  6 |   "\\8", "\\9";"
+`;
+
+exports[`non-octal-eight-and-nine.js - {"trailingComma":"all"} [espree] format 1`] = `
+"Invalid escape sequence (3:3)
+  1 | // https://github.com/babel/babel/pull/11852
+  2 |
+> 3 | "\\8","\\9";
+    |   ^
+  4 | () => {
+  5 |   "use strict";
+  6 |   "\\8", "\\9";"
+`;
+
 exports[`non-octal-eight-and-nine.js - {"trailingComma":"all"} format 1`] = `
 ====================================options=====================================
 parsers: ["babel", "flow"]
diff --git a/tests/format/js/strings/jsfmt.spec.js b/tests/format/js/strings/jsfmt.spec.js
index 23e9edc554f5..c1f60b1648bb 100644
--- a/tests/format/js/strings/jsfmt.spec.js
+++ b/tests/format/js/strings/jsfmt.spec.js
@@ -1,2 +1,13 @@
-run_spec(import.meta, ["babel", "flow"]);
-run_spec(import.meta, ["babel", "flow"], { trailingComma: "all" });
+run_spec(import.meta, ["babel", "flow"], {
+  errors: {
+    acorn: ["non-octal-eight-and-nine.js"],
+    espree: ["non-octal-eight-and-nine.js"],
+  },
+});
+run_spec(import.meta, ["babel", "flow"], {
+  trailingComma: "all",
+  errors: {
+    acorn: ["non-octal-eight-and-nine.js"],
+    espree: ["non-octal-eight-and-nine.js"],
+  },
+});
diff --git a/tests/format/typescript/optional-variance/__snapshots__/jsfmt.spec.js.snap b/tests/format/typescript/optional-variance/__snapshots__/jsfmt.spec.js.snap
index 6924ad0a2810..9db3e0deeea1 100644
--- a/tests/format/typescript/optional-variance/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/format/typescript/optional-variance/__snapshots__/jsfmt.spec.js.snap
@@ -114,9 +114,6 @@ parsers: ["typescript"]
 printWidth: 80
                                                                                 | printWidth
 =====================================input======================================
-// valid JSX
-<in T>() => {}</in>;
-
 type Covariant<out T> = {
     x: T;
 }
@@ -180,12 +177,9 @@ declare class StateNode<TContext, in out TEvent extends { type: string }> {
 }
 
 =====================================output=====================================
-// valid JSX
-<in T>() => {}</in>;
-
-type Covariant<out T> = { x: T };
-type Contravariant<in T> = { f: (x: T) => void };
-type Invariant<in out T> = { f: (x: T) => T };
+type Covariant<out T> = { x: T; };
+type Contravariant<in T> = { f: (x: T) => void; };
+type Invariant<in out T> = { f: (x: T) => T; };
 type T10<out T> = T;
 type T11<in T> = keyof T;
 type T12<out T, out K extends keyof T> = T[K];
@@ -231,3 +225,111 @@ exports[`with-jsx.tsx [typescript] format 1`] = `
   4 | type Covariant<out T> = {
   5 |     x: T;"
 `;
+
+exports[`with-jsx.tsx format 1`] = `
+====================================options=====================================
+parsers: ["typescript"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+type Covariant<out T> = {
+    x: T;
+}
+type Contravariant<in T> = {
+    f: (x: T) => void;
+}
+type Invariant<in out T> = {
+    f: (x: T) => T;
+}
+type T10<out T> = T;
+type T11<in T> = keyof T;
+type T12<out T, out K extends keyof T> = T[K];
+type T13<in out T> = T[keyof T];
+
+type Covariant1<in T> = {
+    x: T;
+}
+
+type Contravariant1<out T> = keyof T;
+
+type Contravariant2<out T> = {
+    f: (x: T) => void;
+}
+
+type Invariant1<in T> = {
+    f: (x: T) => T;
+}
+
+type Invariant2<out T> = {
+    f: (x: T) => T;
+}
+type Foo1<in T> = {
+    x: T;
+    f: FooFn1<T>;
+}
+
+type Foo2<out T> = {
+    x: T;
+    f: FooFn2<T>;
+}
+
+type Foo3<in out T> = {
+    x: T;
+    f: FooFn3<T>;
+}
+
+type T21<in out T> = T;
+
+interface Baz<out T> {}
+interface Baz<in T> {}
+
+interface Parent<out A> {
+    child: Child<A> | null;
+    parent: Parent<A> | null;
+}
+
+declare class StateNode<TContext, in out TEvent extends { type: string }> {
+    _storedEvent: TEvent;
+    _action: ActionObject<TEvent>;
+    _state: StateNode<TContext, any>;
+}
+
+=====================================output=====================================
+type Covariant<out T> = { x: T };
+type Contravariant<in T> = { f: (x: T) => void };
+type Invariant<in out T> = { f: (x: T) => T };
+type T10<out T> = T;
+type T11<in T> = keyof T;
+type T12<out T, out K extends keyof T> = T[K];
+type T13<in out T> = T[keyof T];
+
+type Covariant1<in T> = { x: T };
+
+type Contravariant1<out T> = keyof T;
+
+type Contravariant2<out T> = { f: (x: T) => void };
+
+type Invariant1<in T> = { f: (x: T) => T };
+
+type Invariant2<out T> = { f: (x: T) => T };
+type Foo1<in T> = { x: T; f: FooFn1<T> };
+
+type Foo2<out T> = { x: T; f: FooFn2<T> };
+
+type Foo3<in out T> = { x: T; f: FooFn3<T> };
+
+type T21<in out T> = T;
+
+interface Baz<out T> {}
+interface Baz<in T> {}
+
+interface Parent<out A> { child: Child<A> | null; parent: Parent<A> | null }
+
+declare class StateNode<TContext, in out TEvent extends { type: string }> {
+  _storedEvent: TEvent;
+  _action: ActionObject<TEvent>;
+  _state: StateNode<TContext, any>;
+}
+
+================================================================================
+`;
diff --git a/tests/format/typescript/optional-variance/jsfmt.spec.js b/tests/format/typescript/optional-variance/jsfmt.spec.js
index 72e980aee6c2..29084a9c8a10 100644
--- a/tests/format/typescript/optional-variance/jsfmt.spec.js
+++ b/tests/format/typescript/optional-variance/jsfmt.spec.js
@@ -1,3 +1 @@
-run_spec(import.meta, ["typescript"], {
-  errors: { typescript: ["with-jsx.tsx"] },
-});
+run_spec(import.meta, ["typescript"]);
diff --git a/tests/format/typescript/optional-variance/with-jsx.tsx b/tests/format/typescript/optional-variance/with-jsx.tsx
index bd14abc7a9e5..9210edb034ae 100644
--- a/tests/format/typescript/optional-variance/with-jsx.tsx
+++ b/tests/format/typescript/optional-variance/with-jsx.tsx
@@ -1,6 +1,3 @@
-// valid JSX
-<in T>() => {}</in>;
-
 type Covariant<out T> = {
     x: T;
 }