Add tests, using GitHub Actions. (#7)

* Add tests, using GitHub Actions.

* Change workflow run on PRs to main branch.

.github/workflows/test-terminus-version.yml

@@ -0,0 +1,38 @@
+name: 'Tests: Version'
+
+on:
+  workflow_call:
+    inputs:
+      php-version:
+        required: false
+        type: number
+        default: 8
+      terminus-version:
+        required: false
+        type: string
+        default: 3.0.6
+
+jobs:
+  test_version:
+    runs-on: ubuntu-latest
+    name: ${{ inputs.terminus-version }}
+    steps:
+
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ inputs.php-version }}
+
+      - name: Setup Terminus
+        uses: ./
+        with:
+          terminus-version: ${{ inputs.terminus-version }}
+
+      - name: Expect to be version ${{ inputs.terminus-version }}
+        run: |
+          terminus -V --no-ansi
+          if [[ $(terminus -V --no-ansi) != *"${{ inputs.terminus-version }}" ]]; then exit 1; fi
+

.github/workflows/test-terminus.yml

@@ -0,0 +1,57 @@
+name: WIP Tests
+
+on:
+  pull_request:
+    branches:
+    - main
+
+jobs:
+  test_terminus:
+    runs-on: ubuntu-latest
+    name: Terminus Setup
+    steps:
+
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Setup Terminus
+        uses: ./
+
+      - name: Expect terminus command to be available
+        run: terminus -V
+
+      - name: Expect terminus to print art
+        run: terminus art
+
+  test_terminus_login:
+    runs-on: ubuntu-latest
+    name: Terminus Login
+    steps:
+
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Setup Terminus
+        uses: ./
+        with:
+          pantheon-machine-token: ${{ secrets.PANTHEON_MACHINE_TOKEN }}
+
+      - name: Expect to be logged in
+        run: terminus whoami --no-ansi > /dev/null
+
+  test_terminus_version:
+    name: Terminus Version
+    uses: ./.github/workflows/test-terminus-version.yml
+
+  test_terminus_version_304:
+    name: Terminus Version
+    uses: ./.github/workflows/test-terminus-version.yml
+    with:
+      terminus-version: 3.0.4
+
+  test_terminus_version_266:
+    name: Terminus Version
+    uses: ./.github/workflows/test-terminus-version.yml
+    with:
+      php-version: 7.4
+      terminus-version: 2.6.6

action.yml

@@ -33,6 +33,7 @@ runs:
         TERMINUS_RELEASE: ${{ inputs.terminus-version || env.TERMINUS_RELEASE }}
 
     - name: Login to Pantheon
+      if: ${{ inputs.pantheon-machine-token }}
       shell: bash
       run: |
         terminus auth:login --machine-token="${{ inputs.pantheon-machine-token }}"