From 511f7fa71969173918d6fef3a449064a875c2012 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hu=C3=A1ng=20J=C3=B9nli=C3=A0ng?= <jlhwung@gmail.com>
Date: Wed, 1 Jul 2020 23:07:07 -0400
Subject: [PATCH 1/2] test: add console warn spy on register tests

---
 packages/babel-register/test/cache.js | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/packages/babel-register/test/cache.js b/packages/babel-register/test/cache.js
index f4fb2de2e8ec..70953ce2639e 100644
--- a/packages/babel-register/test/cache.js
+++ b/packages/babel-register/test/cache.js
@@ -31,6 +31,8 @@ function resetCache() {
 describe("@babel/register - caching", () => {
   describe("cache", () => {
     let load, get, save;
+    let stderr = "";
+    let consoleWarnSpy;
 
     beforeEach(() => {
       // Since lib/cache is a singleton we need to fully reload it
@@ -40,9 +42,16 @@ describe("@babel/register - caching", () => {
       load = cache.load;
       get = cache.get;
       save = cache.save;
+
+      consoleWarnSpy = jest
+        .spyOn(console, "warn")
+        .mockImplementation(err => (stderr += err));
     });
 
-    afterEach(cleanCache);
+    afterEach(() => {
+      cleanCache();
+      consoleWarnSpy.mockRestore();
+    });
     afterAll(resetCache);
 
     it("should load and get cached data", () => {
@@ -88,10 +97,12 @@ describe("@babel/register - caching", () => {
     if (process.platform !== "win32") {
       it("should be disabled when CACHE_PATH is not allowed to read", () => {
         writeCache({ foo: "bar" }, 0o266);
-
         load();
 
         expect(get()).toEqual({});
+        expect(consoleWarnSpy.mock.calls[0][0]).toContain(
+          "Babel could not read cache file",
+        );
       });
     }
 
@@ -104,6 +115,9 @@ describe("@babel/register - caching", () => {
       process.nextTick(() => {
         load();
         expect(get()).toEqual({});
+        expect(consoleWarnSpy.mock.calls[0][0]).toContain(
+          "Babel could not write cache to file",
+        );
         cb();
       });
     });

From c0f00581786046e37eb660ce9e4d8d6c9ebe8652 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hu=C3=A1ng=20J=C3=B9nli=C3=A0ng?= <jlhwung@gmail.com>
Date: Thu, 2 Jul 2020 10:13:17 -0400
Subject: [PATCH 2/2] address review comments

---
 packages/babel-register/test/cache.js | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/packages/babel-register/test/cache.js b/packages/babel-register/test/cache.js
index 70953ce2639e..ee939729dbf8 100644
--- a/packages/babel-register/test/cache.js
+++ b/packages/babel-register/test/cache.js
@@ -31,7 +31,6 @@ function resetCache() {
 describe("@babel/register - caching", () => {
   describe("cache", () => {
     let load, get, save;
-    let stderr = "";
     let consoleWarnSpy;
 
     beforeEach(() => {
@@ -43,9 +42,7 @@ describe("@babel/register - caching", () => {
       get = cache.get;
       save = cache.save;
 
-      consoleWarnSpy = jest
-        .spyOn(console, "warn")
-        .mockImplementation(err => (stderr += err));
+      consoleWarnSpy = jest.spyOn(console, "warn").mockImplementation(() => {});
     });
 
     afterEach(() => {