jest: do not let the user's PATH bleed into the tests

Signed-off-by: Dennis Ameling <dennis@dennisameling.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dennisameling

.jest/set-env-vars.js

@@ -0,0 +1,5 @@
+/*
+This ensures that the PATH of the machine that the tests are running on,
+doesn't leak into our tests.
+*/
+process.env.PATH = ''

jest.config.js

@@ -1,11 +1,12 @@
 module.exports = {
   clearMocks: true,
   moduleFileExtensions: ['js', 'ts'],
+  setupFiles: ["<rootDir>/.jest/set-env-vars.js"],
   testEnvironment: 'node',
   testMatch: ['**/*.test.ts'],
   testRunner: 'jest-circus/runner',
   transform: {
     '^.+\\.ts$': 'ts-jest'
   },
   verbose: true
-}
+}