E2E tests for the @actions/artifact package (#421)

* End-to-end artifact tests

* E2E tests for artifact package

.github/workflows/artifact-tests.yml

@@ -0,0 +1,79 @@
+name: artifact-unit-tests
+on: push
+
+jobs:
+  build:
+    name: Build
+
+    strategy:
+      matrix:
+        runs-on: [ubuntu-latest, windows-latest, macOS-latest]
+      fail-fast: false
+
+    runs-on: ${{ matrix.runs-on }}
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Set Node.js 12.x
+      uses: actions/setup-node@v1
+      with:
+        node-version: 12.x
+
+    # In order to upload & download artifacts from a shell script, certain env variables need to be set that are only available in the
+    # node context. This runs a local action that gets and sets the necessary env variables that are needed
+    - name: Set env variables
+      uses: ./packages/artifact/__tests__/ci-test-action/
+
+    # Need root node_modules because certain npm packages like jest are configured for the entire repository and it won't be possible
+    # without these to just compile the artifacts package
+    - name: Install root npm packages
+      run: npm ci
+
+    - name: Compile artifact package
+      run: |
+        npm ci
+        npm run tsc
+      working-directory: packages/artifact
+    
+    - name: Set artifact file contents
+      run: |
+        echo "::set-env name=non-gzip-artifact-content::hello"
+        echo "::set-env name=gzip-artifact-content::Some large amount of text that has a compression ratio that is greater than 100%. If greater than 100%, gzip is used to upload the file"
+
+    - name: Create files that will be uploaded
+      run: |
+        mkdir artifact-path 
+        echo ${{ env.non-gzip-artifact-content }} > artifact-path/world.txt
+        echo ${{ env.gzip-artifact-content }} > artifact-path/gzip.txt
+
+    # We're using node -e to call the functions directly available in the @actions/artifact package
+    - name: Upload artifacts using uploadArtifact()
+      run: |
+        node -e "Promise.resolve(require('./packages/artifact/lib/artifact-client').create().uploadArtifact('my-artifact-1',['artifact-path/world.txt'], '${{ github.workspace }}'))"
+        node -e "Promise.resolve(require('./packages/artifact/lib/artifact-client').create().uploadArtifact('my-artifact-2',['artifact-path/gzip.txt'], '${{ github.workspace }}'))"
+
+    - name: Download artifacts using downloadArtifact()
+      run: |
+        mkdir artifact-1-directory
+        node -e "Promise.resolve(require('./packages/artifact/lib/artifact-client').create().downloadArtifact('my-artifact-1','artifact-1-directory'))"
+        mkdir artifact-2-directory
+        node -e "Promise.resolve(require('./packages/artifact/lib/artifact-client').create().downloadArtifact('my-artifact-2','artifact-2-directory'))"
+    
+    - name: Verify downloadArtifact()
+      shell: bash
+      run: |
+        scripts/test-artifact-file.sh "artifact-1-directory/artifact-path/world.txt" "${{ env.non-gzip-artifact-content }}"
+        scripts/test-artifact-file.sh "artifact-2-directory/artifact-path/gzip.txt" "${{ env.gzip-artifact-content }}"
+
+    - name: Download artifacts using downloadAllArtifacts()
+      run: |
+        mkdir multi-artifact-directory
+        node -e "Promise.resolve(require('./packages/artifact/lib/artifact-client').create().downloadAllArtifacts('multi-artifact-directory'))"
+
+    - name: Verify downloadAllArtifacts()
+      shell: bash
+      run: |
+        scripts/test-artifact-file.sh "multi-artifact-directory/my-artifact-1/artifact-path/world.txt" "${{ env.non-gzip-artifact-content }}"
+        scripts/test-artifact-file.sh "multi-artifact-directory/my-artifact-2/artifact-path/gzip.txt" "${{ env.gzip-artifact-content }}"