Optimize and Enable E2E tests on Windows

Author: sisco0

.github/workflows/e2e-tests.yml

@@ -12,38 +12,54 @@ jobs:
   run-e2e:
     strategy:
       matrix:
-        # Disabled windows because it's too slow
-        # See: https://github.com/NomicFoundation/hardhat/issues/5247
-        os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-latest, macos-latest, windows-latest]
     name: Run E2E tests on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     env:
-      # TODO: the e2e tests fail on windows when pnpm is used,
-      # for what we think is a bug in pnpm. We set this env
-      # variable to skip that combination until we find a solution.
-      #
-      # The failure is caused by `pnpm hardhat init` executing
-      # `hardhat init` twice on windows, which results in the
-      # second execution failing because `hardhat init` cannot
-      # be run on an existing project.
       IS_WINDOWS: ${{ matrix.os == 'windows-latest' }}
     steps:
       - uses: actions/checkout@v4
+      
+      - name: Cache pnpm modules
+        uses: actions/cache@v3
+        with:
+          path: ~/.pnpm-store
+          key: ${{ runner.os }}-pnpm-${{ hashFiles('**/pnpm-lock.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-pnpm-
+
       - uses: pnpm/action-setup@v2
         with:
           version: 9
+
       - uses: actions/setup-node@v4
         with:
           node-version: 18
+
+      - name: Install dependencies
+        run: pnpm install
+
       - name: Run fixture-projects script
         run: |
           cd e2e
           chmod +x run-fixture-projects.sh
           ./run-fixture-projects.sh
         shell: bash
+        if: runner.os != 'Windows'
+
       - name: Run test-project-initialization script
         run: |
           cd e2e
           chmod +x test-project-initialization.sh
           ./test-project-initialization.sh
         shell: bash
+        if: runner.os != 'Windows'
+        
+      - name: Run Windows-specific scripts
+        run: |
+          cd e2e
+          .\run-fixture-projects.ps1
+          .\test-project-initialization.ps1
+        shell: pwsh
+        if: runner.os == 'Windows'
+