parser_test.go

package envconf_test

import (
	"fmt"
	"os"
	"testing"

	"github.com/antonmashko/envconf"
	"github.com/antonmashko/envconf/option"
)

func TestParse_EmptyStruct_OK(t *testing.T) {
	if err := envconf.Parse(&struct{}{}); err != nil {
		t.Errorf("failed to parse empty struct. err=%#v", err)
	}
}

func TestParse_NilData_NilDataErr(t *testing.T) {
	if err := envconf.Parse(nil); err == nil || err != envconf.ErrNilData {
		t.Errorf("err doesn't equals to ErrNilData. err=%#v", err)
	}
}

func TestParse_NilValue_NilDataErr(t *testing.T) {
	var d *struct{}
	if err := envconf.Parse(d); err == nil || err != envconf.ErrNilData {
		t.Errorf("err doesn't equals to ErrNilData. err=%#v", err)
	}
}

func TestParse_PassDataByValue_Err(t *testing.T) {
	data := struct {
		Field string `default:"123"`
	}{}
	if err := envconf.Parse(data); err == nil {
		t.Fatal("expected error but got nil")
	}
}

func TestParse_FlagParsedCallback_OK(t *testing.T) {
	x := 0
	fpo := option.WithFlagParsed(func() error {
		x = 1
		return nil
	})
	tc := struct{}{}
	if err := envconf.Parse(&tc, fpo); err != nil {
		t.Errorf("failed to parse. err=%s", err)
	}
	if x != 1 {
		t.Errorf("incorrect value was set. %#v", x)
	}
}

func TestParse_InvalidData_Err(t *testing.T) {
	var cfg string
	if err := envconf.Parse(&cfg); err == nil {
		t.Fail()
	}
}

func TestParse_AutoGeneratedEnvNames_Ok(t *testing.T) {
	t.Run("EnvVar", func(t *testing.T) {
		var cfg struct {
			Inner1 struct {
				Field1 string `env:"*"`
			}
		}
		var expectedResult = "ok"
		os.Setenv("INNER1_FIELD1", expectedResult)
		if err := envconf.Parse(&cfg); err != nil {
			t.Fatal(err)
		}

		if cfg.Inner1.Field1 != expectedResult {
			t.Fatalf("incorrect result. expected=%s actual=%s", expectedResult, cfg.Inner1.Field1)
		}
	})

	t.Run("EnvVarChangedParentName", func(t *testing.T) {
		var cfg struct {
			Inner1 struct {
				Field1 string `env:"*"`
			} `envconf:"INNER"`
		}
		var expectedResult = "ok"
		os.Setenv("INNER_FIELD1", expectedResult)
		if err := envconf.Parse(&cfg); err != nil {
			t.Fatal(err)
		}

		if cfg.Inner1.Field1 != expectedResult {
			t.Fatalf("incorrect result. expected=%s actual=%s", expectedResult, cfg.Inner1.Field1)
		}
	})
}

func TestParse_NotAssignableInterface_Err(t *testing.T) {
	cfg := struct {
		Field1 fmt.Stringer `default:"10"`
	}{}
	if err := envconf.Parse(&cfg); err == nil {
		t.Fail()
	}
}