fix(jest-runner): support jest@28 (#3501)

Support jest@28 and its new way of exporting TestEnvironment.
stryker-mutator · May 5, 2022 · f312ad6 · f312ad6
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diff --git a/docs/jest-runner.md b/docs/jest-runner.md
@@ -126,9 +126,11 @@ If you're using a custom test environment, you'll need to mixin the Stryker func
 ```js
 // my-custom-jest-environment.js
 const { mixinJestEnvironment } = require('@stryker-mutator/jest-runner');
-const NodeEnvironment = require('jest-environment-node');
+const { TestEnvironment } = require('jest-environment-node');
+// const TestEnvironment = require('jest-environment-node'); // 👈 Jest@27 or lower
 
-class MyCustomTestEnvironment extends NodeEnvironment {
+
+class MyCustomTestEnvironment extends TestEnvironment {
   // custom magic here ✨
 }