From d94bcaabfe169fe2db17c5d2052726a98578de7e Mon Sep 17 00:00:00 2001
From: huntharo <harold@pwrdrvr.com>
Date: Fri, 10 Apr 2026 16:55:50 -0400
Subject: [PATCH 1/3] ci: dogfood configure-nodejs in cache primer flow

---
 .github/workflows/ci.yml | 16 +++++++++++++++-
 action.yml               | 21 ++++++++++++++++++++-
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 304f98f..82ed27a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,13 +7,27 @@ on:
   pull_request:
 
 jobs:
+  install-deps:
+    name: Install Deps
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Configure Node.js
+        uses: ./
+        with:
+          node-version: 22.x
+          lookup-only: "true"
+
   unit:
     name: Unit Tests
+    needs: install-deps
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
 
-      - uses: ./
+      - name: Configure Node.js
+        uses: ./
         with:
           node-version: 22.x
 
diff --git a/action.yml b/action.yml
index 2a72ad4..2c43e1a 100644
--- a/action.yml
+++ b/action.yml
@@ -84,7 +84,7 @@ runs:
 
     - name: Restore dependencies from cache
       id: cache-node-modules
-      uses: actions/cache@v5
+      uses: actions/cache/restore@v5
       with:
         path: ${{ steps.resolve-cache-paths.outputs.cachePaths }}
         key: node-modules-${{ inputs.node-version }}-${{ runner.os }}-${{ runner.arch }}-${{ steps.resolve-cache-paths.outputs.workingDirectoryKey }}-${{ steps.resolve-package-manager.outputs.managerCacheKey }}-${{ steps.resolve-package-manager.outputs.lockfileSha }}${{ steps.resolve-cache-paths.outputs.cacheKeySuffixSegment }}
@@ -95,3 +95,22 @@ runs:
       shell: bash
       working-directory: ${{ steps.resolve-cache-paths.outputs.workingDirectory }}
       run: ${{ steps.resolve-package-manager.outputs.installCommand }}
+
+    - name: Detect cacheable dependency paths
+      id: detect-cache-paths
+      if: steps.cache-node-modules.outputs.cache-hit != 'true'
+      shell: bash
+      working-directory: ${{ steps.resolve-cache-paths.outputs.workingDirectory }}
+      run: |
+        if find . -type d -name node_modules -print -quit | grep -q .; then
+          echo "exists=true" >> "$GITHUB_OUTPUT"
+        else
+          echo "exists=false" >> "$GITHUB_OUTPUT"
+        fi
+
+    - name: Save dependencies to cache
+      if: steps.cache-node-modules.outputs.cache-hit != 'true' && steps.detect-cache-paths.outputs.exists == 'true'
+      uses: actions/cache/save@v5
+      with:
+        path: ${{ steps.resolve-cache-paths.outputs.cachePaths }}
+        key: node-modules-${{ inputs.node-version }}-${{ runner.os }}-${{ runner.arch }}-${{ steps.resolve-cache-paths.outputs.workingDirectoryKey }}-${{ steps.resolve-package-manager.outputs.managerCacheKey }}-${{ steps.resolve-package-manager.outputs.lockfileSha }}${{ steps.resolve-cache-paths.outputs.cacheKeySuffixSegment }}

From 254a95dcf81d2feb2524363acdacf199e297085e Mon Sep 17 00:00:00 2001
From: huntharo <harold@pwrdrvr.com>
Date: Fri, 10 Apr 2026 16:57:40 -0400
Subject: [PATCH 2/3] docs: clarify package-manager override is optional

---
 README.md  | 2 +-
 action.yml | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index bd4e8dd..70541e9 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ steps:
 | Input | Default | Description |
 | --- | --- | --- |
 | `node-version` | `22.x` | Node.js version to install with `actions/setup-node` |
-| `package-manager` | `""` | Explicit override for `npm`, `pnpm`, or `yarn` |
+| `package-manager` | `""` | Optional override for `npm`, `pnpm`, or `yarn`; by default the action follows the package manager inferred from `package.json` and the lockfile present |
 | `working-directory` | `"."` | Repository-relative directory containing `package.json` and the lockfile |
 | `cache-key-suffix` | `""` | Optional suffix appended to the dependency cache key when you want to namespace cache entries |
 | `lookup-only` | `"false"` | When `true`, only checks whether the cache exists and skips downloading it |
diff --git a/action.yml b/action.yml
index 2c43e1a..e9080b0 100644
--- a/action.yml
+++ b/action.yml
@@ -6,7 +6,7 @@ inputs:
     description: "Node.js version to install"
     default: "22.x"
   package-manager:
-    description: "Explicit package manager override (npm, yarn, pnpm)"
+    description: "Optional override for npm, yarn, or pnpm; defaults to the package manager inferred from package.json and lockfiles"
     default: ""
   working-directory:
     description: "Repository-relative directory containing package.json and lockfile"

From 2daf4e2e8194e8daf07740d5f35e155d406dce87 Mon Sep 17 00:00:00 2001
From: huntharo <harold@pwrdrvr.com>
Date: Fri, 10 Apr 2026 17:06:07 -0400
Subject: [PATCH 3/3] chore: move dogfood coverage to configure-nodejs-test

---
 .github/workflows/ci.yml             | 140 --------------------------
 .gitignore                           |   6 --
 README.md                            |  10 +-
 fixtures/npm-basic/check.mjs         |   7 --
 fixtures/npm-basic/package-lock.json |  19 ----
 fixtures/npm-basic/package.json      |   8 --
 fixtures/pnpm-basic/check.mjs        |   7 --
 fixtures/pnpm-basic/package.json     |   9 --
 fixtures/pnpm-basic/pnpm-lock.yaml   |  22 ----
 fixtures/yarn-basic/.yarnrc.yml      |   1 -
 fixtures/yarn-basic/check.mjs        |   7 --
 fixtures/yarn-basic/package.json     |   9 --
 fixtures/yarn-basic/yarn.lock        |  21 ----
 package-lock.json                    |  10 --
 package.json                         |   8 --
 test/resolve-cache-paths.test.mjs    | 109 --------------------
 test/resolve-manager.test.mjs        | 144 ---------------------------
 17 files changed, 3 insertions(+), 534 deletions(-)
 delete mode 100644 .github/workflows/ci.yml
 delete mode 100644 fixtures/npm-basic/check.mjs
 delete mode 100644 fixtures/npm-basic/package-lock.json
 delete mode 100644 fixtures/npm-basic/package.json
 delete mode 100644 fixtures/pnpm-basic/check.mjs
 delete mode 100644 fixtures/pnpm-basic/package.json
 delete mode 100644 fixtures/pnpm-basic/pnpm-lock.yaml
 delete mode 100644 fixtures/yarn-basic/.yarnrc.yml
 delete mode 100644 fixtures/yarn-basic/check.mjs
 delete mode 100644 fixtures/yarn-basic/package.json
 delete mode 100644 fixtures/yarn-basic/yarn.lock
 delete mode 100644 package-lock.json
 delete mode 100644 package.json
 delete mode 100644 test/resolve-cache-paths.test.mjs
 delete mode 100644 test/resolve-manager.test.mjs

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
deleted file mode 100644
index 82ed27a..0000000
--- a/.github/workflows/ci.yml
+++ /dev/null
@@ -1,140 +0,0 @@
-name: CI
-
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-
-jobs:
-  install-deps:
-    name: Install Deps
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v6
-
-      - name: Configure Node.js
-        uses: ./
-        with:
-          node-version: 22.x
-          lookup-only: "true"
-
-  unit:
-    name: Unit Tests
-    needs: install-deps
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v6
-
-      - name: Configure Node.js
-        uses: ./
-        with:
-          node-version: 22.x
-
-      - name: Run unit tests
-        run: npm test
-
-  fixture-lookup:
-    name: Fixture Lookup (${{ matrix.package-manager }})
-    needs: unit
-    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - package-manager: npm
-            fixture: fixtures/npm-basic
-            install-command: npm ci
-            lockfile-name: package-lock.json
-          - package-manager: pnpm
-            fixture: fixtures/pnpm-basic
-            install-command: pnpm install --frozen-lockfile
-            lockfile-name: pnpm-lock.yaml
-          - package-manager: yarn
-            fixture: fixtures/yarn-basic
-            install-command: yarn install --immutable
-            lockfile-name: yarn.lock
-    steps:
-      - uses: actions/checkout@v6
-        with:
-          sparse-checkout: |
-            action.yml
-            scripts
-            ${{ matrix.fixture }}
-          sparse-checkout-cone-mode: false
-
-      - name: Configure Node.js
-        id: configure-nodejs
-        uses: ./
-        with:
-          working-directory: ${{ matrix.fixture }}
-          cache-key-suffix: fixture-tests
-          lookup-only: "true"
-
-      - name: Assert resolved action outputs
-        shell: bash
-        run: |
-          test "${{ steps.configure-nodejs.outputs.package-manager }}" = "${{ matrix.package-manager }}"
-          test "${{ steps.configure-nodejs.outputs.install-command }}" = "${{ matrix.install-command }}"
-          test "${{ steps.configure-nodejs.outputs.working-directory }}" = "${{ matrix.fixture }}"
-          test "${{ steps.configure-nodejs.outputs.lockfile-name }}" = "${{ matrix.lockfile-name }}"
-
-      - name: Assert lookup-only behavior
-        working-directory: ${{ matrix.fixture }}
-        shell: bash
-        run: |
-          if [ "${{ steps.configure-nodejs.outputs.cache-hit }}" = "true" ]; then
-            test ! -d node_modules
-          else
-            test -d node_modules
-            node check.mjs
-          fi
-
-  fixture-validate:
-    name: Fixture Validate (${{ matrix.package-manager }})
-    needs: fixture-lookup
-    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - package-manager: npm
-            fixture: fixtures/npm-basic
-            install-command: npm ci
-            lockfile-name: package-lock.json
-          - package-manager: pnpm
-            fixture: fixtures/pnpm-basic
-            install-command: pnpm install --frozen-lockfile
-            lockfile-name: pnpm-lock.yaml
-          - package-manager: yarn
-            fixture: fixtures/yarn-basic
-            install-command: yarn install --immutable
-            lockfile-name: yarn.lock
-    steps:
-      - uses: actions/checkout@v6
-        with:
-          sparse-checkout: |
-            action.yml
-            scripts
-            ${{ matrix.fixture }}
-          sparse-checkout-cone-mode: false
-
-      - name: Configure Node.js
-        id: configure-nodejs
-        uses: ./
-        with:
-          working-directory: ${{ matrix.fixture }}
-          cache-key-suffix: fixture-tests
-
-      - name: Assert restore behavior
-        shell: bash
-        run: |
-          test "${{ steps.configure-nodejs.outputs.package-manager }}" = "${{ matrix.package-manager }}"
-          test "${{ steps.configure-nodejs.outputs.install-command }}" = "${{ matrix.install-command }}"
-          test "${{ steps.configure-nodejs.outputs.working-directory }}" = "${{ matrix.fixture }}"
-          test "${{ steps.configure-nodejs.outputs.lockfile-name }}" = "${{ matrix.lockfile-name }}"
-          test "${{ steps.configure-nodejs.outputs.cache-hit }}" = "true"
-
-      - name: Validate installed dependency
-        working-directory: ${{ matrix.fixture }}
-        run: node check.mjs
diff --git a/.gitignore b/.gitignore
index d4f6654..e43b0f9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1 @@
-node_modules/
 .DS_Store
-
-fixtures/*/node_modules/
-fixtures/*/.pnp.*
-fixtures/*/.yarn/install-state.gz
-fixtures/*/.yarn/cache/
diff --git a/README.md b/README.md
index 70541e9..42f659d 100644
--- a/README.md
+++ b/README.md
@@ -100,19 +100,15 @@ The first release targets Yarn repositories that install into `node_modules`.
 
 - Yarn 2+ uses `yarn install --immutable`
 - Yarn 1 uses `yarn install --frozen-lockfile`
-- the fixture coverage in this repository uses Yarn 4 with `nodeLinker: node-modules`
+- the dogfood coverage in `pwrdrvr/configure-nodejs-test` uses Yarn 4 with `nodeLinker: node-modules`
 
 Plug'n'Play-specific caching is intentionally out of scope for `v1`.
 
 ## Development
 
-This repository includes three end-to-end fixtures under `fixtures/`:
+Dogfood coverage for this action lives in [`pwrdrvr/configure-nodejs-test`](https://github.com/pwrdrvr/configure-nodejs-test).
 
-- `fixtures/npm-basic`
-- `fixtures/pnpm-basic`
-- `fixtures/yarn-basic`
-
-The CI workflow runs local unit tests plus end-to-end matrix coverage for those fixtures, followed by cache-lookup verification in a second matrix job.
+That repository checks out `pwrdrvr/configure-nodejs` at a configurable ref, runs the unit tests for the helper scripts, and exercises npm, pnpm, and Yarn fixtures through the action entrypoint.
 
 ## Releases
 
diff --git a/fixtures/npm-basic/check.mjs b/fixtures/npm-basic/check.mjs
deleted file mode 100644
index 129ef92..0000000
--- a/fixtures/npm-basic/check.mjs
+++ /dev/null
@@ -1,7 +0,0 @@
-import pc from 'picocolors';
-
-if (typeof pc.green !== 'function') {
-  throw new Error('Expected picocolors.green to be available after npm install.');
-}
-
-console.log(pc.green('npm fixture dependency loaded'));
diff --git a/fixtures/npm-basic/package-lock.json b/fixtures/npm-basic/package-lock.json
deleted file mode 100644
index 475bb1e..0000000
--- a/fixtures/npm-basic/package-lock.json
+++ /dev/null
@@ -1,19 +0,0 @@
-{
-  "name": "npm-basic-fixture",
-  "lockfileVersion": 3,
-  "requires": true,
-  "packages": {
-    "": {
-      "name": "npm-basic-fixture",
-      "dependencies": {
-        "picocolors": "1.1.1"
-      }
-    },
-    "node_modules/picocolors": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.1.tgz",
-      "integrity": "sha512-xceH2snhtb5M9liqDsmEw56le376mTZkEX/jEb/RxNFyegNul7eNslCXP9FDj/Lcu0X8KEyMceP2ntpaHrDEVA==",
-      "license": "ISC"
-    }
-  }
-}
diff --git a/fixtures/npm-basic/package.json b/fixtures/npm-basic/package.json
deleted file mode 100644
index b6d1cd8..0000000
--- a/fixtures/npm-basic/package.json
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-  "name": "npm-basic-fixture",
-  "private": true,
-  "type": "module",
-  "dependencies": {
-    "picocolors": "1.1.1"
-  }
-}
diff --git a/fixtures/pnpm-basic/check.mjs b/fixtures/pnpm-basic/check.mjs
deleted file mode 100644
index 5e0fd88..0000000
--- a/fixtures/pnpm-basic/check.mjs
+++ /dev/null
@@ -1,7 +0,0 @@
-import pc from 'picocolors';
-
-if (typeof pc.green !== 'function') {
-  throw new Error('Expected picocolors.green to be available after pnpm install.');
-}
-
-console.log(pc.green('pnpm fixture dependency loaded'));
diff --git a/fixtures/pnpm-basic/package.json b/fixtures/pnpm-basic/package.json
deleted file mode 100644
index 7e4d060..0000000
--- a/fixtures/pnpm-basic/package.json
+++ /dev/null
@@ -1,9 +0,0 @@
-{
-  "name": "pnpm-basic-fixture",
-  "private": true,
-  "type": "module",
-  "packageManager": "pnpm@10.12.1",
-  "dependencies": {
-    "picocolors": "1.1.1"
-  }
-}
diff --git a/fixtures/pnpm-basic/pnpm-lock.yaml b/fixtures/pnpm-basic/pnpm-lock.yaml
deleted file mode 100644
index 8a296ba..0000000
--- a/fixtures/pnpm-basic/pnpm-lock.yaml
+++ /dev/null
@@ -1,22 +0,0 @@
-lockfileVersion: '9.0'
-
-settings:
-  autoInstallPeers: true
-  excludeLinksFromLockfile: false
-
-importers:
-
-  .:
-    dependencies:
-      picocolors:
-        specifier: 1.1.1
-        version: 1.1.1
-
-packages:
-
-  picocolors@1.1.1:
-    resolution: {integrity: sha512-xceH2snhtb5M9liqDsmEw56le376mTZkEX/jEb/RxNFyegNul7eNslCXP9FDj/Lcu0X8KEyMceP2ntpaHrDEVA==}
-
-snapshots:
-
-  picocolors@1.1.1: {}
diff --git a/fixtures/yarn-basic/.yarnrc.yml b/fixtures/yarn-basic/.yarnrc.yml
deleted file mode 100644
index 3186f3f..0000000
--- a/fixtures/yarn-basic/.yarnrc.yml
+++ /dev/null
@@ -1 +0,0 @@
-nodeLinker: node-modules
diff --git a/fixtures/yarn-basic/check.mjs b/fixtures/yarn-basic/check.mjs
deleted file mode 100644
index 663fc86..0000000
--- a/fixtures/yarn-basic/check.mjs
+++ /dev/null
@@ -1,7 +0,0 @@
-import pc from 'picocolors';
-
-if (typeof pc.green !== 'function') {
-  throw new Error('Expected picocolors.green to be available after yarn install.');
-}
-
-console.log(pc.green('yarn fixture dependency loaded'));
diff --git a/fixtures/yarn-basic/package.json b/fixtures/yarn-basic/package.json
deleted file mode 100644
index 94bd3bc..0000000
--- a/fixtures/yarn-basic/package.json
+++ /dev/null
@@ -1,9 +0,0 @@
-{
-  "name": "yarn-basic-fixture",
-  "private": true,
-  "type": "module",
-  "packageManager": "yarn@4.6.0",
-  "dependencies": {
-    "picocolors": "1.1.1"
-  }
-}
diff --git a/fixtures/yarn-basic/yarn.lock b/fixtures/yarn-basic/yarn.lock
deleted file mode 100644
index b5df1ae..0000000
--- a/fixtures/yarn-basic/yarn.lock
+++ /dev/null
@@ -1,21 +0,0 @@
-# This file is generated by running "yarn install" inside your project.
-# Manual changes might be lost - proceed with caution!
-
-__metadata:
-  version: 8
-  cacheKey: 10c0
-
-"picocolors@npm:1.1.1":
-  version: 1.1.1
-  resolution: "picocolors@npm:1.1.1"
-  checksum: 10c0/e2e3e8170ab9d7c7421969adaa7e1b31434f789afb9b3f115f6b96d91945041ac3ceb02e9ec6fe6510ff036bcc0bf91e69a1772edc0b707e12b19c0f2d6bcf58
-  languageName: node
-  linkType: hard
-
-"yarn-basic-fixture@workspace:.":
-  version: 0.0.0-use.local
-  resolution: "yarn-basic-fixture@workspace:."
-  dependencies:
-    picocolors: "npm:1.1.1"
-  languageName: unknown
-  linkType: soft
diff --git a/package-lock.json b/package-lock.json
deleted file mode 100644
index 7fb649d..0000000
--- a/package-lock.json
+++ /dev/null
@@ -1,10 +0,0 @@
-{
-  "name": "@pwrdrvr/configure-nodejs-action",
-  "lockfileVersion": 3,
-  "requires": true,
-  "packages": {
-    "": {
-      "name": "@pwrdrvr/configure-nodejs-action"
-    }
-  }
-}
diff --git a/package.json b/package.json
deleted file mode 100644
index b8fefa9..0000000
--- a/package.json
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-  "name": "@pwrdrvr/configure-nodejs-action",
-  "private": true,
-  "type": "module",
-  "scripts": {
-    "test": "node --test"
-  }
-}
diff --git a/test/resolve-cache-paths.test.mjs b/test/resolve-cache-paths.test.mjs
deleted file mode 100644
index 261a672..0000000
--- a/test/resolve-cache-paths.test.mjs
+++ /dev/null
@@ -1,109 +0,0 @@
-import test from 'node:test';
-import assert from 'node:assert/strict';
-import fs from 'fs';
-import os from 'os';
-import path from 'path';
-
-import {
-  buildCachePaths,
-  buildResult,
-  buildWorkingDirectoryKey,
-  normalizeCacheKeySuffix,
-  resolveWorkingDirectory,
-} from '../scripts/resolve-cache-paths.mjs';
-
-function withTempDir(callback) {
-  const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'configure-nodejs-paths-'));
-
-  try {
-    callback(tempDir);
-  } finally {
-    fs.rmSync(tempDir, { recursive: true, force: true });
-  }
-}
-
-test('resolveWorkingDirectory preserves root-relative usage', () => {
-  withTempDir((tempDir) => {
-    const result = resolveWorkingDirectory(tempDir, '.');
-
-    assert.equal(result.workingDirectory, '.');
-    assert.equal(result.absoluteWorkingDirectory, tempDir);
-  });
-});
-
-test('resolveWorkingDirectory resolves nested directories relative to the repository root', () => {
-  withTempDir((tempDir) => {
-    fs.mkdirSync(path.join(tempDir, 'fixtures', 'npm-basic'), { recursive: true });
-
-    const result = resolveWorkingDirectory(tempDir, 'fixtures/npm-basic');
-
-    assert.equal(result.workingDirectory, 'fixtures/npm-basic');
-    assert.match(result.absoluteWorkingDirectory, /fixtures\/npm-basic$/);
-  });
-});
-
-test('resolveWorkingDirectory rejects paths that escape the repository root', () => {
-  withTempDir((tempDir) => {
-    assert.throws(
-      () => resolveWorkingDirectory(tempDir, '../outside'),
-      /resolves outside the repository root/,
-    );
-  });
-});
-
-test('resolveWorkingDirectory rejects missing paths', () => {
-  withTempDir((tempDir) => {
-    assert.throws(
-      () => resolveWorkingDirectory(tempDir, 'missing'),
-      /does not exist/,
-    );
-  });
-});
-
-test('buildWorkingDirectoryKey generates a stable root key and nested slug', () => {
-  assert.equal(buildWorkingDirectoryKey('.'), 'root');
-  assert.match(
-    buildWorkingDirectoryKey('fixtures/yarn-basic'),
-    /^fixtures__yarn-basic-[a-f0-9]{8}$/,
-  );
-});
-
-test('normalizeCacheKeySuffix preserves safe values and normalizes separators', () => {
-  assert.equal(normalizeCacheKeySuffix('fixture-tests'), 'fixture-tests');
-  assert.equal(normalizeCacheKeySuffix(' fixture tests / ci '), 'fixture-tests-ci');
-  assert.equal(normalizeCacheKeySuffix('   '), '');
-});
-
-test('buildCachePaths scopes cache globs to the resolved working directory', () => {
-  assert.deepEqual(buildCachePaths('.'), [
-    'node_modules',
-    '**/node_modules',
-    '!node_modules/.cache',
-    '!**/node_modules/.cache',
-  ]);
-
-  assert.deepEqual(buildCachePaths('fixtures/pnpm-basic'), [
-    'fixtures/pnpm-basic/node_modules',
-    'fixtures/pnpm-basic/**/node_modules',
-    '!fixtures/pnpm-basic/node_modules/.cache',
-    '!fixtures/pnpm-basic/**/node_modules/.cache',
-  ]);
-});
-
-test('buildResult combines normalized working-directory and cache metadata', () => {
-  withTempDir((tempDir) => {
-    fs.mkdirSync(path.join(tempDir, 'fixtures', 'npm-basic'), { recursive: true });
-
-    const result = buildResult({
-      cwd: tempDir,
-      workingDirectory: 'fixtures/npm-basic',
-      cacheKeySuffix: 'fixture tests',
-    });
-
-    assert.equal(result.workingDirectory, 'fixtures/npm-basic');
-    assert.match(result.workingDirectoryKey, /^fixtures__npm-basic-[a-f0-9]{8}$/);
-    assert.equal(result.cachePaths[0], 'fixtures/npm-basic/node_modules');
-    assert.equal(result.cacheKeySuffix, 'fixture-tests');
-    assert.equal(result.cacheKeySuffixSegment, '-fixture-tests');
-  });
-});
diff --git a/test/resolve-manager.test.mjs b/test/resolve-manager.test.mjs
deleted file mode 100644
index b37748f..0000000
--- a/test/resolve-manager.test.mjs
+++ /dev/null
@@ -1,144 +0,0 @@
-import test from 'node:test';
-import assert from 'node:assert/strict';
-import fs from 'fs';
-import os from 'os';
-import path from 'path';
-
-import { buildResult, normalizeManager } from '../scripts/resolve-manager.mjs';
-
-function withTempDir(callback) {
-  const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'configure-nodejs-manager-'));
-
-  try {
-    callback(tempDir);
-  } finally {
-    fs.rmSync(tempDir, { recursive: true, force: true });
-  }
-}
-
-test('normalizeManager validates the supported values', () => {
-  assert.equal(normalizeManager(' PNPM '), 'pnpm');
-  assert.throws(
-    () => normalizeManager('bun'),
-    /Unsupported package manager "bun"/,
-  );
-});
-
-test('buildResult resolves npm from an explicit package-manager override', () => {
-  withTempDir((tempDir) => {
-    fs.writeFileSync(
-      path.join(tempDir, 'package.json'),
-      JSON.stringify({ name: 'fixture', version: '1.0.0' }),
-    );
-    fs.writeFileSync(path.join(tempDir, 'package-lock.json'), '{}\n');
-
-    const result = buildResult({ cwd: tempDir, explicitManager: 'npm' });
-
-    assert.equal(result.packageManager, 'npm');
-    assert.equal(result.installCommand, 'npm ci');
-    assert.equal(result.lockfileName, 'package-lock.json');
-  });
-});
-
-test('buildResult resolves pnpm from packageManager metadata', () => {
-  withTempDir((tempDir) => {
-    fs.writeFileSync(
-      path.join(tempDir, 'package.json'),
-      JSON.stringify({
-        name: 'fixture',
-        version: '1.0.0',
-        packageManager: 'pnpm@10.12.1',
-      }),
-    );
-    fs.writeFileSync(path.join(tempDir, 'pnpm-lock.yaml'), 'lockfileVersion: 9.0\n');
-
-    const result = buildResult({ cwd: tempDir, explicitManager: '' });
-
-    assert.equal(result.packageManager, 'pnpm');
-    assert.equal(result.packageManagerVersion, '10.12.1');
-    assert.equal(result.installCommand, 'pnpm install --frozen-lockfile');
-    assert.equal(result.managerCacheKey, 'pnpm-10.12.1');
-  });
-});
-
-test('buildResult resolves modern Yarn installs with --immutable', () => {
-  withTempDir((tempDir) => {
-    fs.writeFileSync(
-      path.join(tempDir, 'package.json'),
-      JSON.stringify({
-        name: 'fixture',
-        version: '1.0.0',
-        packageManager: 'yarn@4.6.0',
-      }),
-    );
-    fs.writeFileSync(path.join(tempDir, 'yarn.lock'), '# yarn lockfile\n');
-    fs.writeFileSync(path.join(tempDir, '.yarnrc.yml'), 'nodeLinker: node-modules\n');
-
-    const result = buildResult({ cwd: tempDir, explicitManager: '' });
-
-    assert.equal(result.packageManager, 'yarn');
-    assert.equal(result.installCommand, 'yarn install --immutable');
-  });
-});
-
-test('buildResult falls back to classic Yarn install flags when no Berry signal exists', () => {
-  withTempDir((tempDir) => {
-    fs.writeFileSync(
-      path.join(tempDir, 'package.json'),
-      JSON.stringify({ name: 'fixture', version: '1.0.0' }),
-    );
-    fs.writeFileSync(path.join(tempDir, 'yarn.lock'), '# yarn classic lockfile\n');
-
-    const result = buildResult({ cwd: tempDir, explicitManager: 'yarn' });
-
-    assert.equal(result.packageManager, 'yarn');
-    assert.equal(result.installCommand, 'yarn install --frozen-lockfile');
-  });
-});
-
-test('buildResult rejects multiple lockfiles in one working directory', () => {
-  withTempDir((tempDir) => {
-    fs.writeFileSync(
-      path.join(tempDir, 'package.json'),
-      JSON.stringify({ name: 'fixture', version: '1.0.0' }),
-    );
-    fs.writeFileSync(path.join(tempDir, 'package-lock.json'), '{}\n');
-    fs.writeFileSync(path.join(tempDir, 'pnpm-lock.yaml'), 'lockfileVersion: 9.0\n');
-
-    assert.throws(
-      () => buildResult({ cwd: tempDir, explicitManager: '' }),
-      /Found multiple lockfiles/,
-    );
-  });
-});
-
-test('buildResult honors an explicit manager when multiple lockfiles are present', () => {
-  withTempDir((tempDir) => {
-    fs.writeFileSync(
-      path.join(tempDir, 'package.json'),
-      JSON.stringify({ name: 'fixture', version: '1.0.0' }),
-    );
-    fs.writeFileSync(path.join(tempDir, 'package-lock.json'), '{}\n');
-    fs.writeFileSync(path.join(tempDir, 'pnpm-lock.yaml'), 'lockfileVersion: 9.0\n');
-
-    const result = buildResult({ cwd: tempDir, explicitManager: 'npm' });
-
-    assert.equal(result.packageManager, 'npm');
-    assert.equal(result.lockfileName, 'package-lock.json');
-    assert.equal(result.installCommand, 'npm ci');
-  });
-});
-
-test('buildResult rejects missing lockfiles when the manager cannot be resolved', () => {
-  withTempDir((tempDir) => {
-    fs.writeFileSync(
-      path.join(tempDir, 'package.json'),
-      JSON.stringify({ name: 'fixture', version: '1.0.0' }),
-    );
-
-    assert.throws(
-      () => buildResult({ cwd: tempDir, explicitManager: '' }),
-      /Could not determine package manager/,
-    );
-  });
-});