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resolver_test.go
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resolver_test.go
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package kong_test
import (
"errors"
"os"
"reflect"
"strings"
"testing"
"github.com/stretchr/testify/require"
"github.com/alecthomas/kong"
)
type envMap map[string]string
func tempEnv(env envMap) func() {
for k, v := range env {
os.Setenv(k, v)
}
return func() {
for k := range env {
os.Unsetenv(k)
}
}
}
func newEnvParser(t *testing.T, cli interface{}, env envMap) (*kong.Kong, func()) {
t.Helper()
restoreEnv := tempEnv(env)
parser := mustNew(t, cli)
return parser, restoreEnv
}
func TestEnvarsFlagBasic(t *testing.T) {
var cli struct {
String string `env:"KONG_STRING"`
Slice []int `env:"KONG_SLICE"`
}
parser, unsetEnvs := newEnvParser(t, &cli, envMap{
"KONG_STRING": "bye",
"KONG_SLICE": "5,2,9",
})
defer unsetEnvs()
_, err := parser.Parse([]string{})
require.NoError(t, err)
require.Equal(t, "bye", cli.String)
require.Equal(t, []int{5, 2, 9}, cli.Slice)
}
func TestEnvarsFlagOverride(t *testing.T) {
var cli struct {
Flag string `env:"KONG_FLAG"`
}
parser, restoreEnv := newEnvParser(t, &cli, envMap{"KONG_FLAG": "bye"})
defer restoreEnv()
_, err := parser.Parse([]string{"--flag=hello"})
require.NoError(t, err)
require.Equal(t, "hello", cli.Flag)
}
func TestEnvarsTag(t *testing.T) {
var cli struct {
Slice []int `env:"KONG_NUMBERS"`
}
parser, restoreEnv := newEnvParser(t, &cli, envMap{"KONG_NUMBERS": "5,2,9"})
defer restoreEnv()
_, err := parser.Parse([]string{})
require.NoError(t, err)
require.Equal(t, []int{5, 2, 9}, cli.Slice)
}
func TestEnvarsWithDefault(t *testing.T) {
var cli struct {
Flag string `env:"KONG_FLAG" default:"default"`
}
parser, restoreEnv := newEnvParser(t, &cli, envMap{})
defer restoreEnv()
_, err := parser.Parse(nil)
require.NoError(t, err)
require.Equal(t, "default", cli.Flag)
parser, restoreEnv = newEnvParser(t, &cli, envMap{"KONG_FLAG": "moo"})
defer restoreEnv()
_, err = parser.Parse(nil)
require.NoError(t, err)
require.Equal(t, "moo", cli.Flag)
}
func TestJSONBasic(t *testing.T) {
var cli struct {
String string
Slice []int
SliceWithCommas []string
Bool bool
}
json := `{
"string": "🍕",
"slice": [5, 8],
"bool": true,
"slice_with_commas": ["a,b", "c"]
}`
r, err := kong.JSON(strings.NewReader(json))
require.NoError(t, err)
parser := mustNew(t, &cli, kong.Resolvers(r))
_, err = parser.Parse([]string{})
require.NoError(t, err)
require.Equal(t, "🍕", cli.String)
require.Equal(t, []int{5, 8}, cli.Slice)
require.Equal(t, []string{"a,b", "c"}, cli.SliceWithCommas)
require.True(t, cli.Bool)
}
type testUppercaseMapper struct{}
func (testUppercaseMapper) Decode(ctx *kong.DecodeContext, target reflect.Value) error {
var value string
err := ctx.Scan.PopValueInto("lowercase", &value)
if err != nil {
return err
}
target.SetString(strings.ToUpper(value))
return nil
}
func TestResolversWithMappers(t *testing.T) {
var cli struct {
Flag string `env:"KONG_MOO" type:"upper"`
}
restoreEnv := tempEnv(envMap{"KONG_MOO": "meow"})
defer restoreEnv()
parser := mustNew(t, &cli,
kong.NamedMapper("upper", testUppercaseMapper{}),
)
_, err := parser.Parse([]string{})
require.NoError(t, err)
require.Equal(t, "MEOW", cli.Flag)
}
func TestResolverWithBool(t *testing.T) {
var cli struct {
Bool bool
}
var resolver kong.ResolverFunc = func(context *kong.Context, parent *kong.Path, flag *kong.Flag) (interface{}, error) {
if flag.Name == "bool" {
return true, nil
}
return nil, nil
}
p := mustNew(t, &cli, kong.Resolvers(resolver))
_, err := p.Parse(nil)
require.NoError(t, err)
require.True(t, cli.Bool)
}
func TestLastResolverWins(t *testing.T) {
var cli struct {
Int []int
}
var first kong.ResolverFunc = func(context *kong.Context, parent *kong.Path, flag *kong.Flag) (interface{}, error) {
if flag.Name == "int" {
return 1, nil
}
return nil, nil
}
var second kong.ResolverFunc = func(context *kong.Context, parent *kong.Path, flag *kong.Flag) (interface{}, error) {
if flag.Name == "int" {
return 2, nil
}
return nil, nil
}
p := mustNew(t, &cli, kong.Resolvers(first, second))
_, err := p.Parse(nil)
require.NoError(t, err)
require.Equal(t, []int{2}, cli.Int)
}
func TestResolverSatisfiesRequired(t *testing.T) {
// nolint: govet
var cli struct {
Int int `required`
}
var resolver kong.ResolverFunc = func(context *kong.Context, parent *kong.Path, flag *kong.Flag) (interface{}, error) {
if flag.Name == "int" {
return 1, nil
}
return nil, nil
}
_, err := mustNew(t, &cli, kong.Resolvers(resolver)).Parse(nil)
require.NoError(t, err)
require.Equal(t, 1, cli.Int)
}
func TestResolverTriggersHooks(t *testing.T) {
ctx := &hookContext{}
var cli struct {
Flag hookValue
}
var first kong.ResolverFunc = func(context *kong.Context, parent *kong.Path, flag *kong.Flag) (interface{}, error) {
if flag.Name == "flag" {
return "one", nil
}
return nil, nil
}
_, err := mustNew(t, &cli, kong.Bind(ctx), kong.Resolvers(first)).Parse(nil)
require.NoError(t, err)
require.Equal(t, "one", string(cli.Flag))
require.Equal(t, []string{"before:", "after:one"}, ctx.values)
}
type validatingResolver struct {
err error
}
func (v *validatingResolver) Validate(app *kong.Application) error { return v.err }
func (v *validatingResolver) Resolve(context *kong.Context, parent *kong.Path, flag *kong.Flag) (interface{}, error) {
return nil, nil
}
func TestValidatingResolverErrors(t *testing.T) {
resolver := &validatingResolver{err: errors.New("invalid")}
var cli struct{}
_, err := mustNew(t, &cli, kong.Resolvers(resolver)).Parse(nil)
require.EqualError(t, err, "invalid")
}