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package kstore
import (
"errors"
"os"
"path/filepath"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
type document struct {
Name string `json:"name" yaml:"name"`
Count int `json:"count" yaml:"count"`
}
func TestJSONRoundTrip(t *testing.T) {
path := filepath.Join(t.TempDir(), "document.json")
want := document{Name: "example", Count: 3}
require.NoError(t, Save(path, want, JSON, 0o600))
got, err := Load[document](path, JSON)
require.NoError(t, err)
assert.Equal(t, want, got)
}
func TestYAMLRoundTrip(t *testing.T) {
path := filepath.Join(t.TempDir(), "document.yaml")
want := document{Name: "example", Count: 3}
require.NoError(t, Save(path, want, YAML, 0o640))
got, err := Load[document](path, YAML)
require.NoError(t, err)
assert.Equal(t, want, got)
}
func TestLoadMalformedDocument(t *testing.T) {
path := filepath.Join(t.TempDir(), "document.json")
require.NoError(t, os.WriteFile(path, []byte("not json"), 0o600))
_, err := Load[document](path, JSON)
assert.Error(t, err)
}
func TestLoadMissingDocument(t *testing.T) {
path := filepath.Join(t.TempDir(), "missing.json")
_, err := Load[document](path, JSON)
assert.ErrorIs(t, err, os.ErrNotExist)
}
func TestSaveSetsRequestedPermissions(t *testing.T) {
path := filepath.Join(t.TempDir(), "document.json")
require.NoError(t, Save(path, document{}, JSON, 0o640))
info, err := os.Stat(path)
require.NoError(t, err)
assert.Equal(t, os.FileMode(0o640), info.Mode().Perm())
}
func TestSaveFailedWriteLeavesExistingDocumentUnchanged(t *testing.T) {
path := filepath.Join(t.TempDir(), "document.json")
require.NoError(t, Save(path, document{Name: "original"}, JSON, 0o600))
err := Save(filepath.Join(path, "child"), document{Name: "replacement"}, JSON, 0o600)
assert.Error(t, err)
loaded, loadErr := Load[document](path, JSON)
require.NoError(t, loadErr)
assert.Equal(t, "original", loaded.Name)
}
func TestSaveReturnsCodecErrors(t *testing.T) {
path := filepath.Join(t.TempDir(), "document.json")
codec := failingCodec{err: errors.New("codec failed")}
err := Save(path, document{}, codec, 0o600)
assert.ErrorIs(t, err, codec.err)
}
type failingCodec struct{ err error }
func (c failingCodec) Marshal(any) ([]byte, error) { return nil, c.err }
func (c failingCodec) Unmarshal([]byte, any) error { return c.err }
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