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package arg
import (
"bytes"
"os"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestWriteUsage(t *testing.T) {
expectedUsage := "usage: example [--verbose] [--dataset DATASET] [--optimize OPTIMIZE] INPUT [OUTPUT [OUTPUT ...]]\n"
expectedHelp := `usage: example [--verbose] [--dataset DATASET] [--optimize OPTIMIZE] INPUT [OUTPUT [OUTPUT ...]]
positional arguments:
input
output positional output
options:
--verbose, -v verbosity level
--dataset DATASET dataset to use
--optimize OPTIMIZE, -O OPTIMIZE
optimization level
--help, -h display this help and exit
`
var args struct {
Input string `arg:"positional"`
Output []string `arg:"positional,help:positional output"`
Verbose bool `arg:"-v,help:verbosity level"`
Dataset string `arg:"help:dataset to use"`
Optimize int `arg:"-O,help:optimization level"`
}
p, err := NewParser(&args)
require.NoError(t, err)
os.Args[0] = "example"
var usage bytes.Buffer
p.WriteUsage(&usage)
assert.Equal(t, expectedUsage, usage.String())
var help bytes.Buffer
p.WriteHelp(&help)
assert.Equal(t, expectedHelp, help.String())
}
func TestUsageLongPositionalWithHelp(t *testing.T) {
expectedHelp := `usage: example VERYLONGPOSITIONALWITHHELP
positional arguments:
verylongpositionalwithhelp
this positional argument is very long
options:
--help, -h display this help and exit
`
var args struct {
VeryLongPositionalWithHelp string `arg:"positional,help:this positional argument is very long"`
}
p, err := NewParser(&args)
require.NoError(t, err)
os.Args[0] = "example"
var help bytes.Buffer
p.WriteHelp(&help)
assert.Equal(t, expectedHelp, help.String())
}
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