Add a test for the command's usage message #67

	name: CI
	on:
	push:
	branches: [ master ]
	pull_request:
	# The branches below must be a subset of the branches above
	branches: [ master ]

	jobs:
	linux_tests:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	go: [ '1.19']
	name: Go ${{ matrix.go }} tests - Linux
	steps:
	- uses: actions/checkout@v2
	- uses: actions/setup-go@v2
	with:
	go-version: ${{ matrix.go }}
	- run: go test
	- name: Archive testdata for diagnosis
	if: ${{ always() }}
	uses: actions/upload-artifact@v3
	with:
	name: testdata-linux
	path: testdata

	macos_tests:
	runs-on: macOS-latest
	strategy:
	matrix:
	go: [ '1.19']
	name: Go ${{ matrix.go }} tests - MacOS
	steps:
	- uses: actions/checkout@v2
	- uses: actions/setup-go@v2
	with:
	go-version: ${{ matrix.go }}
	- run: go test
	- name: Archive testdata for diagnosis
	if: ${{ always() }}
	uses: actions/upload-artifact@v3
	with:
	name: testdata-macos
	path: testdata

	windows_tests:
	runs-on: windows-latest
	strategy:
	matrix:
	go: [ '1.19' ]
	name: Go ${{ matrix.go }} tests - Windows
	steps:
	- uses: actions/checkout@v2
	- uses: actions/setup-go@v2
	with:
	go-version: ${{ matrix.go }}
	- run: go test
	- name: Archive testdata for diagnosis
	if: ${{ always() }}
	uses: actions/upload-artifact@v3
	with:
	name: testdata-windows
	path: testdata

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