diff --git a/src/test/cli-options.test.ts b/src/test/cli-options.test.ts
index d271b501a..98851e806 100644
--- a/src/test/cli-options.test.ts
+++ b/src/test/cli-options.test.ts
@@ -9,7 +9,7 @@ import * as assert from 'uvu/assert';
 import {suite} from 'uvu';
 import {rigTest} from './util/rig-test.js';
 import {WireitTestRig} from './util/test-rig.js';
-import {Options} from '../cli-options.js';
+import {Agent, Options} from '../cli-options.js';
 import {Result} from '../error.js';
 
 const test = suite<object>();
@@ -67,8 +67,8 @@ async function assertOptions(
   });
 }
 
-for (const command of ['npm', 'yarn', 'pnpm'] as const) {
-  const agent = command === 'yarn' ? 'yarnClassic' : command;
+for (const command of ['npm', 'yarn', 'pnpm', 'yarnBerry'] as const) {
+  const agent: Agent = command === 'yarn' ? 'yarnClassic' : command;
   // eslint-disable-next-line @typescript-eslint/unbound-method
   const skipIfYarn = command === 'yarn' ? test.skip : test;
   // eslint-disable-next-line @typescript-eslint/unbound-method
diff --git a/src/test/util/test-rig.ts b/src/test/util/test-rig.ts
index 488cf2946..a52c86a94 100644
--- a/src/test/util/test-rig.ts
+++ b/src/test/util/test-rig.ts
@@ -64,22 +64,33 @@ export class WireitTestRig
    */
   override async setup() {
     await super.setup();
-    const absWireitBinaryPath = pathlib.resolve(repoRoot, 'bin', 'wireit.js');
-    const absWireitTempInstallPath = pathlib.resolve(
-      this.temp,
-      'node_modules',
-      '.bin',
-      'wireit',
+
+    Promise.all(
+      [
+        ['wireit', ['bin', 'wireit.js']] as const,
+        ['yarnBerry', ['third_party', '.yarn', 'releases', 'yarn-4.0.1.cjs']] as const,
+      ].map(
+        async ([ name, pathParts ]) => {
+          const binaryPath = pathlib.resolve(repoRoot, ...pathParts);
+          const tempInstallPath = pathlib.resolve(
+            this.temp,
+            'node_modules',
+            '.bin',
+            name,
+          );
+
+          if (IS_WINDOWS) {
+            // Npm install works differently on Windows, since it won't recognize a
+            // shebang like "#!/usr/bin/env node". Npm instead uses the cmd-shim
+            // package to generate Windows shell wrappers for each binary, so we do
+            // that here too.
+            await cmdShim(binaryPath, tempInstallPath);
+          } else {
+            await this.symlink(binaryPath, tempInstallPath, 'file');
+          }
+        }
+      )
     );
-    if (IS_WINDOWS) {
-      // Npm install works differently on Windows, since it won't recognize a
-      // shebang like "#!/usr/bin/env node". Npm instead uses the cmd-shim
-      // package to generate Windows shell wrappers for each binary, so we do
-      // that here too.
-      await cmdShim(absWireitBinaryPath, absWireitTempInstallPath);
-    } else {
-      await this.symlink(absWireitBinaryPath, absWireitTempInstallPath, 'file');
-    }
   }
 
   /**