test: fix test due to a package removed from the npm registry

pkg-manager/core/test/install/autoInstallPeers.ts

@@ -428,6 +428,11 @@ test('installation on a workspace with many complex circular dependencies does n
     ignoreScripts: true,
     lockfileOnly: true,
     strictPeerDependencies: false,
+    registries: {
+      // A temporary workaround due to stylus removal from the npm registry.
+      // Related issue: https://github.com/stylus/stylus/issues/2938
+      default: 'https://registry.npmmirror.com',
+    },
     allProjects: [
       {
         buildIndex: 0,

pkg-manager/core/test/utils/testDefaults.ts

@@ -11,6 +11,7 @@ export function testDefaults<T> (
     fastUnpack?: boolean
     storeDir?: string
     prefix?: string
+    registries?: Registries
   },
   resolveOpts?: any, // eslint-disable-line
   fetchOpts?: any, // eslint-disable-line
@@ -26,6 +27,7 @@ export function testDefaults<T> (
   const { storeController, storeDir, cacheDir } = createTempStore({
     ...opts,
     clientOptions: {
+      registries: opts?.registries,
       ...resolveOpts,
       ...fetchOpts,
     },