From 97ab52c6183fa23b535e6988d7b55e0392128450 Mon Sep 17 00:00:00 2001
From: Pete Bacon Darwin <pete@bacondarwin.com>
Date: Thu, 18 Jul 2019 21:05:31 +0100
Subject: [PATCH] test(ivy): ensure that `runInEachFileSystem` cleans up after
 itself (#31544)

Previously the last file-system being tested was left as the current
file-system. Now it is reset to an `InvalidFileSystem` to ensure future
tests are not affected.

PR Close #31544
---
 .../src/ngtsc/file_system/testing/src/test_helper.ts            | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/packages/compiler-cli/src/ngtsc/file_system/testing/src/test_helper.ts b/packages/compiler-cli/src/ngtsc/file_system/testing/src/test_helper.ts
index b2b550d381..f9ff163cc9 100644
--- a/packages/compiler-cli/src/ngtsc/file_system/testing/src/test_helper.ts
+++ b/packages/compiler-cli/src/ngtsc/file_system/testing/src/test_helper.ts
@@ -9,6 +9,7 @@
 import * as ts from 'typescript';
 
 import {absoluteFrom, setFileSystem} from '../../src/helpers';
+import {InvalidFileSystem} from '../../src/invalid_file_system';
 import {AbsoluteFsPath} from '../../src/types';
 
 import {MockFileSystem} from './mock_file_system';
@@ -43,6 +44,7 @@ function runInEachFileSystemFn(callback: (os: string) => void) {
 function runInFileSystem(os: string, callback: (os: string) => void, error: boolean) {
   describe(`<<FileSystem: ${os}>>`, () => {
     beforeEach(() => initMockFileSystem(os));
+    afterEach(() => setFileSystem(new InvalidFileSystem()));
     callback(os);
     if (error) {
       afterAll(() => { throw new Error(`runInFileSystem limited to ${os}, cannot pass`); });