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chore: mock stealthy-require in tests #9855

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merged 3 commits into from
Apr 23, 2020
Merged

chore: mock stealthy-require in tests #9855

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a9599fc
chore: mock stealthy-require in tests
SimenB Apr 21, 2020
81ae108
chore: only warn once about cache manipulation
SimenB Apr 23, 2020
ee0afac
Merge branch 'master' into mock-stealthy-require
SimenB Apr 23, 2020
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9 changes: 8 additions & 1 deletion packages/jest-runtime/src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -155,6 +155,7 @@ class Runtime {
private _virtualMocks: BooleanObject;
private _moduleImplementation?: typeof nativeModule.Module;
private jestObjectCaches: Map<string, Jest>;
private _hasWarnedAboutRequireCacheModification = false;

constructor(
config: Config.ProjectConfig,
Expand Down Expand Up @@ -1302,7 +1303,13 @@ class Runtime {
moduleRequire.resolve = resolve;
moduleRequire.cache = (() => {
const notPermittedMethod = () => {
console.warn('`require.cache` modification is not permitted');
if (!this._hasWarnedAboutRequireCacheModification) {
this._environment.global.console.warn(
'`require.cache` modification is not permitted',
);

this._hasWarnedAboutRequireCacheModification = true;
}
return true;
};
return new Proxy<RequireCache>(Object.create(null), {
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3 changes: 3 additions & 0 deletions testSetupFile.js
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Expand Up @@ -8,3 +8,6 @@
// Some of the `jest-runtime` tests are very slow and cause
// timeouts on travis
jest.setTimeout(70000);

// this module does some funky stuff with `require.cache`, flooding the terminal with output
jest.mock('stealthy-require', () => (_, m) => m());
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$ yarn why stealthy-require
=> Found "[email protected]"
info Reasons this module exists
   - "_project_#jest-environment-jsdom#jsdom#request-promise-native" depends on it
   - Hoisted from "_project_#jest-environment-jsdom#jsdom#request-promise-native#stealthy-require"

jsdom/jsdom#2792

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@SimenB should it be a best practice recommended for everyone?