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diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
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+name: Test
+
+on:
+  push:
+  pull_request:
+  schedule:
+    # Weekly, at 5:45 AM on Friday (somewhat randomly chosen).
+    - cron: '45 5 * * 5'
+  workflow_dispatch:
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        platform: [x86, x64]
+        cygwin: [0, 1]
+        os: [ubuntu-18.04, windows-2019, windows-2016]
+
+        include:
+          # Prettier run names.
+          - {os: ubuntu-18.04, name: Ubuntu}
+          - {os: windows-2019, name: Windows Server 2019}
+          - {os: windows-2016, name: Windows Server 2016}
+          - {cygwin: 1, name: Cygwin}
+        exclude:
+          # No Cygwin on Ubuntu.
+          - {os: ubuntu-18.04, cygwin: 1}
+          # Cygwin is the same on Windows Server 2016 & 2019.
+          - {os: windows-2016, cygwin: 1}
+
+    runs-on: '${{ matrix.os }}'
+
+    name: '${{ matrix.name }} / ${{ matrix.platform }}'
+
+    defaults:
+      run:
+        shell: pwsh
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Clean up PATH
+        uses: egor-tensin/cleanup-path@v1
+        if: runner.os == 'Windows'
+
+      - name: Install Cygwin
+        uses: egor-tensin/setup-cygwin@master
+        with:
+          platform: '${{ matrix.platform }}'
+        if: matrix.cygwin
+
+      - name: Set up Clang
+        id: setup
+        uses: ./
+        with:
+          platform: '${{ matrix.platform }}'
+          cygwin: '${{ matrix.cygwin }}'
+
+      - name: Build foo.exe
+        run: |
+          $flags = @()
+          if ('${{ matrix.platform }}' -eq 'x86') {
+              $flags += '-m32'
+          }
+          $flags += @(
+              '-x', 'c++',
+              '-std=c++14',
+              '-o', 'foo',
+              'foo.cpp',
+              '-lstdc++'
+          )
+          if ('${{ runner.os }}' -eq 'Linux') {
+              $flags += '-lpthread'
+          }
+          & '${{ steps.setup.outputs.clangxx }}' $flags
+          & (Join-Path . foo)