test: add strict version-match jobs to reproduce #225 / #227

The existing version tests only check output format via regex, which is
why the PATH-shadowing bug (#230) slipped through — the bootstrap pnpm's
version string matched the regex just as well as the requested version.

- test_version_respects_request: runs the action with `version: 9.15.5`
  and `version: 10.33.0` (both differ from the bootstrap) and asserts
  that `pnpm --version` matches exactly. Regression test for #225/#230.

- test_package_manager_field: writes a `packageManager: pnpm@<v>` entry
  into package.json, runs the action with no `version:` input, and
  asserts exact match. Reproduces #227; currently expected to fail
  since `packageManager` extraction was intentionally not added.

.github/workflows/test.yaml

@@ -129,6 +129,82 @@ jobs:
           pnpm add is-odd
         shell: bash
 
+  test_version_respects_request:
+    name: 'Test version input is actually installed (${{ matrix.version }}, ${{ matrix.os }})'
+    # Regression test for #225 / #230: the bootstrap pnpm on PATH was shadowing the self-updated binary,
+    # so a user requesting e.g. `version: 9.15.5` would silently get the bootstrap version.
+
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+        version:
+          - '9.15.5'
+          - '10.33.0'
+
+    steps:
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+
+      - name: Run the action
+        uses: ./
+        with:
+          version: ${{ matrix.version }}
+
+      - name: 'Test: exact version installed'
+        run: |
+          required='${{ matrix.version }}'
+          actual="$(pnpm --version)"
+          echo "pnpm version: ${actual}"
+          if [ "${actual}" != "${required}" ]; then
+            echo "Expected pnpm version ${required}, but got ${actual}"
+            exit 1
+          fi
+        shell: bash
+
+  test_package_manager_field:
+    name: 'Test packageManager field is respected (${{ matrix.version }}, ${{ matrix.os }})'
+    # Reproduces #227: when `packageManager` is set in package.json and no `version:` input is given,
+    # the action should install the version specified there.
+
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+        version:
+          - '9.15.5'
+          - '10.33.0'
+
+    steps:
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+
+      - name: Set up package.json with packageManager field
+        run: echo '{"packageManager":"pnpm@${{ matrix.version }}"}' > package.json
+        shell: bash
+
+      - name: Run the action
+        uses: ./
+
+      - name: 'Test: exact version installed'
+        run: |
+          required='${{ matrix.version }}'
+          actual="$(pnpm --version)"
+          echo "pnpm version: ${actual}"
+          if [ "${actual}" != "${required}" ]; then
+            echo "Expected pnpm version ${required}, but got ${actual}"
+            exit 1
+          fi
+        shell: bash
+
   test_dev_engines:
     name: Test with devEngines.packageManager
 

src/install-pnpm/run.ts

@@ -40,11 +40,13 @@ export async function runSelfInstaller(inputs: Inputs): Promise<number> {
   const pnpmHome = standalone && process.platform === 'win32'
     ? path.join(dest, 'node_modules', '@pnpm', 'exe')
     : path.join(dest, 'node_modules', '.bin')
-  // pnpm expects PNPM_HOME/bin in PATH for global binaries (e.g. node
-  // installed via `pnpm runtime`). Add it first so the next addPath
-  // (pnpmHome itself, which contains pnpm.exe) has higher precedence.
-  addPath(path.join(pnpmHome, 'bin'))
+  // PNPM_HOME/bin is where `pnpm self-update` places the target version
+  // binary. It must have higher PATH precedence than pnpmHome (which
+  // contains the bootstrap binary) so the self-updated version is found
+  // first. The bootstrap pnpm is invoked via absolute path, not PATH,
+  // so this ordering does not affect the bootstrap step.
   addPath(pnpmHome)
+  addPath(path.join(pnpmHome, 'bin'))
   exportVariable('PNPM_HOME', pnpmHome)
 
   // Ensure pnpm bin link exists — npm ci sometimes doesn't create it