Add basic end-to-end test (#8)

(fixes https://github.com/julia-actions/julia-runtest/issues/25)

.github/workflows/ci.yml

@@ -0,0 +1,76 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - "main"
+      - "master"
+  pull_request:
+
+jobs:
+  test:
+    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        version:
+          - "1.0"
+          - "1" # automatically expands to the latest stable 1.x release of Julia
+          - nightly
+        os:
+          - ubuntu-latest
+          - macOS-latest
+          - windows-latest
+        arch:
+          - x64
+          - x86
+        # 32-bit Julia binaries are not available on macOS
+        exclude:
+          - os: macOS-latest
+            arch: x86
+
+    steps:
+      - name: Checkout Example.jl
+        uses: actions/checkout@v2
+        with:
+          repository: julia-actions/Example.jl
+
+      - name: Verify that test output file does not exist yet
+        run: test ! -f "$HOME/julia-buildpkg"
+        shell: bash
+
+      - name: Checkout julia-buildpkg
+        uses: actions/checkout@v2
+        with:
+          path: ./.github/actions/julia-buildpkg
+
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.version }}
+          arch: ${{ matrix.arch }}
+
+      - uses: actions/cache@v1
+        env:
+          cache-name: cache-artifacts
+        with:
+          path: ~/.julia/artifacts
+          key: ${{ runner.os }}-test-${{ env.cache-name }}-${{ hashFiles('**/Project.toml') }}
+          restore-keys: |
+            ${{ runner.os }}-test-${{ env.cache-name }}-
+            ${{ runner.os }}-test-
+            ${{ runner.os }}-
+
+      - uses: ./.github/actions/julia-buildpkg
+
+      - uses: julia-actions/julia-runtest@v1
+
+      - uses: julia-actions/julia-processcoverage@v1
+
+      - uses: codecov/codecov-action@v1
+        with:
+          file: lcov.info
+
+      - name: Verify that test output file exists
+        run: test -f "$HOME/julia-buildpkg"
+        shell: bash