testing: minimal Bats cli testing setup

.github/workflows/tests.yml

@@ -34,6 +34,9 @@ jobs:
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.py }}
+      - name: Fetch Bats submodules
+        if: "${{ matrix.py == '3.12' }}"
+        run: git submodule update
       - name: Install tox
         run: python -m pip install tox-gh>=1.2
       - name: Setup test suite

pyproject.toml

@@ -58,6 +58,7 @@ universal = true
 
 [tool.ruff]
 line-length = 80
+extend-exclude = ["tests/cli/"]
 
 [tool.ruff.lint]
 # Enable Errors, Warnings, Flakes

tests/cli/test.bats

@@ -0,0 +1,14 @@
+setup() {
+  load 'test_helper/bats-support/load'
+  load 'test_helper/bats-assert/load'
+}
+
+@test "can run" {
+  run gcalcli
+  assert_output --regexp '^usage: .*error:.*required: command\b'
+}
+
+@test "prints correct help" {
+  run gcalcli -h
+  assert_output --regexp 'positional arguments:.*list.*search.*edit.*options:'
+}

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 requires =
     tox>=4
-envlist = lint, type, py3{8,9,10,11,12}
+envlist = lint, type, py3{8,9,10,11,12}, cli
 
 [testenv]
 usedevelop=true
@@ -31,9 +31,16 @@ deps =
 commands =
     mypy {posargs:gcalcli}
 
+[testenv:cli]
+description = run functional tests using Bats
+allowlist_externals =
+    ./tests/cli/bats/bin/bats
+commands =
+    ./tests/cli/bats/bin/bats tests/cli/test.bats
+
 [gh]
 python =
-    3.12 = py312, lint, type
+    3.12 = py312, lint, type, cli
     3.11 = py311
     3.10 = py310
     3.9 = py39