github.com/alecthomas/kong@v0.9.1-0.20240410131203-2ab5733f1179/config_test.go (about) 1 package kong_test 2 3 import ( 4 "encoding/json" 5 "os" 6 "testing" 7 8 "github.com/alecthomas/assert/v2" 9 "github.com/alecthomas/kong" 10 ) 11 12 func TestMultipleConfigLoading(t *testing.T) { 13 var cli struct { 14 Flag string `json:"flag,omitempty"` 15 } 16 17 cli.Flag = "first" 18 first, cleanFirst := makeConfig(t, &cli) 19 defer cleanFirst() 20 21 cli.Flag = "" 22 second, cleanSecond := makeConfig(t, &cli) 23 defer cleanSecond() 24 25 p := mustNew(t, &cli, kong.Configuration(kong.JSON, first, second)) 26 _, err := p.Parse(nil) 27 assert.NoError(t, err) 28 assert.Equal(t, "first", cli.Flag) 29 } 30 31 func TestConfigValidation(t *testing.T) { 32 var cli struct { 33 Flag string `json:"flag,omitempty" enum:"valid" required:""` 34 } 35 36 cli.Flag = "invalid" 37 conf, cleanConf := makeConfig(t, &cli) 38 defer cleanConf() 39 40 p := mustNew(t, &cli, kong.Configuration(kong.JSON, conf)) 41 _, err := p.Parse(nil) 42 assert.Error(t, err) 43 } 44 45 func makeConfig(t *testing.T, config interface{}) (path string, cleanup func()) { 46 t.Helper() 47 w, err := os.CreateTemp("", "") 48 assert.NoError(t, err) 49 defer w.Close() 50 err = json.NewEncoder(w).Encode(config) 51 assert.NoError(t, err) 52 return w.Name(), func() { os.Remove(w.Name()) } 53 }