ci: add workflow for testing formulae

.github/workflows/test.yml

@@ -0,0 +1,110 @@
+name: Test
+
+on:
+  pull_request:
+    branches: [master]
+  push:
+    branches: [master]
+  schedule:
+    - cron: '0 0 * * *'
+
+env:
+  GEAR_VERSIONS: 0.1.6 0.1.5 0.1.4 0.1.3 0.1.2 0.1.1
+  VARA_VERSIONS: 1.1 1.0
+
+jobs:
+  test:
+    name: Test formulae
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          # Gear Linux formulae
+          - os: ubuntu-latest
+            unimplemented: true # TODO: Remove after adding support for Linux
+            formula: gear
+
+          # Vara Linux formulae
+          - os: ubuntu-latest
+            unimplemented: true # TODO: Remove after adding support for Linux
+            formula: vara
+
+          # Gear macOS formulae
+          - os: macOS-latest
+            unimplemented: false # TODO: Remove after adding support for Linux
+            formula: gear
+            version: 0.1.6-92ca3911de2
+
+          - os: macOS-latest
+            unimplemented: false
+            formula: [email protected]
+            version: 0.1.6-92ca3911de2
+
+          - os: macOS-latest
+            unimplemented: false
+            formula: [email protected]
+            version: 0.1.4-696abd96d43
+
+          - os: macOS-latest
+            unimplemented: false
+            formula: [email protected]
+            version: 0.1.4-26eb1b4f84d
+
+          - os: macOS-latest
+            unimplemented: false
+            formula: [email protected]
+            version: 0.1.3-e42c79acee5
+
+          - os: macOS-latest
+            unimplemented: false
+            formula: [email protected]
+            version: 0.1.2-ea26723f253
+
+          - os: macOS-latest
+            unimplemented: false
+            formula: [email protected]
+            version: 0.1.1-7e596de7ab4
+
+          # Vara macOS formulae
+          - os: macOS-latest
+            unimplemented: false
+            formula: vara
+            version: 0.1.6-78dfa07ed34
+
+          - os: macOS-latest
+            unimplemented: false
+            formula: [email protected]
+            version: 0.1.6-78dfa07ed34
+
+          - os: macOS-latest
+            unimplemented: false
+            formula: [email protected]
+            version: 0.1.4-5c685d0f15c
+
+    runs-on: ${{ matrix.os }}
+    continue-on-error: ${{ matrix.unimplemented }} # TODO: Remove after adding support for Linux
+
+    steps:
+      - name: Install brew on Linux
+        if: matrix.os == 'ubuntu-latest'
+        run: |
+          curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh | bash
+          echo "/home/linuxbrew/.linuxbrew/bin" >> $GITHUB_PATH
+          eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"
+          (echo; echo 'eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"') >> $HOME/.bash_profile
+          (echo; echo 'eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"') >> $HOME/.profile
+          brew install hello
+
+      # TODO: Find a solution to add a tap from a PR's branch
+      - name: Add Gear tap from PR's branch
+        if: false # github.event_name == 'pull_request'
+        run: brew tap https://github.com/gear-tech/homebrew-gear/tree/${{ github.ref_name }}
+
+      - name: Add Gear tap from master
+        if: true # github.event_name == 'push'
+        run: brew tap gear-tech/gear
+
+      - name: Test formula
+        run: |
+          brew install ${{ matrix.formula }}
+          gear --version && [ "$(gear --version)" = "gear ${{ matrix.version }}" ]