diff --git a/src/test/cli-options.test.ts b/src/test/cli-options.test.ts
index d271b501a..aef72d145 100644
--- a/src/test/cli-options.test.ts
+++ b/src/test/cli-options.test.ts
@@ -4,13 +4,14 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import * as pathlib from 'path';
 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 * as pathlib from 'path';
+import {Agent, Options} from '../cli-options.js';
+import {IS_WINDOWS} from './util/windows.js';
 import {Result} from '../error.js';
+import {WireitTestRig} from './util/test-rig.js';
+import {rigTest} from './util/rig-test.js';
+import {suite} from 'uvu';
 
 const test = suite<object>();
 
@@ -29,6 +30,58 @@ async function getOptionsResult(
   extraScripts?: Record<string, string>,
 ): Promise<Result<Options>> {
   rig.env.WIREIT_DEBUG_LOG_FILE = '';
+
+  if (command.startsWith('yarnBerry')) {
+    // `yarn` chooses whether to use "classic" or "berry" based on the presence
+    // of `yarnPath` in `.yarnrc.yml`.
+    //
+    // To closest simulate a user's environment, set `yarnPath` and let the
+    // global `yarn` command pick it when testing `yarnBerry`.
+    command = command.replace(/yarnBerry/g, 'yarn');
+
+    extraScripts = Object.fromEntries(
+      Object.entries(extraScripts || {}).map(([scriptName, scriptCommand]) => [
+        scriptName,
+        scriptCommand.replace(/yarnBerry/g, 'yarn'),
+      ]),
+    );
+
+    await rig.write({
+      '.yarnrc.yml': `
+        nodeLinker: node-modules
+        yarnPath: ${pathlib.join(
+          process.cwd(),
+          'third_party',
+          '.yarn',
+          'releases',
+          'yarn-4.0.1.cjs',
+        )}
+      `,
+    });
+
+    // `yarn.lock` tells `yarn` that this test is meant to be its own workspace
+    // root, even though there are higher `package.json` files in the file tree.
+    //
+    // This is the `yarn.lock` you get if you initialize `yarn` in an empty
+    // folder.
+    await rig.write({
+      'yarn.lock': `
+        # This file is generated by running "yarn install" inside your project.
+        # Manual changes might be lost - proceed with caution!
+
+        __metadata:
+          version: 8
+          cacheKey: 10c0
+
+        "root-workspace-0b6124@workspace:.":
+          version: 0.0.0-use.local
+          resolution: "root-workspace-0b6124@workspace:."
+          languageName: unknown
+          linkType: soft
+      `,
+    });
+  }
+
   await rig.write({
     'package.json': {
       scripts: {
@@ -39,7 +92,12 @@ async function getOptionsResult(
       },
     },
   });
-  env = {...env, WIREIT_DEBUG_LOG_FILE: ''};
+
+  env = {
+    ...env,
+    WIREIT_DEBUG_LOG_FILE: '',
+  };
+
   assert.equal((await rig.exec(command, {env}).exit).code, 0);
   return JSON.parse(await rig.read('options.json')) as Result<Options>;
 }
@@ -67,8 +125,12 @@ async function assertOptions(
   });
 }
 
-for (const command of ['npm', 'yarn', 'pnpm'] as const) {
-  const agent = command === 'yarn' ? 'yarnClassic' : command;
+const commands = (['npm', 'yarn', 'pnpm', 'yarnBerry'] as const).filter(
+  (command) => !IS_WINDOWS || command !== 'yarnBerry',
+);
+
+for (const command of commands) {
+  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..aa1ffd49f 100644
--- a/src/test/util/test-rig.ts
+++ b/src/test/util/test-rig.ts
@@ -64,22 +64,30 @@ 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',
+
+    await Promise.all(
+      [['wireit', ['bin', 'wireit.js']] 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');
-    }
   }
 
   /**