package feed

import (
  "encoding/json"
  "testing"
)

func TestDataVersionUnmarshalInvalidData(t *testing.T) {
  test := []byte(`{}`)
  var val DataVersion

  if err := json.Unmarshal(test, &val); err == nil {
    t.Errorf("got \"%s\", exp error", val)
  }
}

func TestDataVersionUnmarshalUnknown(t *testing.T) {
  test := []byte(`"foo"`)
  exp := "unknown data version: foo"
  var val DataVersion

  err := json.Unmarshal(test, &val)
  if err == nil {
    t.Errorf("got \"%s\", exp error", val)
    return
  }

  if err.Error() != exp {
    t.Errorf("got \"%s\", exp \"%s\"", err.Error(), exp)
  }
}

func TestDataVersionUnmarshalValid(t *testing.T) {
  test := []byte(`"4.0"`)
  exp := V40
  var got DataVersion

  if err := json.Unmarshal(test, &got); err != nil {
    t.Error(err)
    return
  }

  if got != exp {
    t.Errorf("got \"%s\", exp \"%s\"", got, exp)
  }
}

func TestDataVersionString(t *testing.T) {
  tests := []struct {
    val DataVersion
    exp string
  } {
    { V40, "4.0" },
    { DataVersion(255), "DataVersion(255)" },
  }

  for _, test := range(tests) {
    t.Run(test.val.String(), func(t *testing.T) {
      got := test.val.String()
      if got != test.exp {
        t.Errorf("got \"%s\", exp \"%s\"", got, test.exp)
      }
    })
  }
}