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join_test.go
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join_test.go
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package xerrors
import (
"bytes"
"encoding/json"
"errors"
"log/slog"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
var errmy = errors.New("plouf")
func TestJoin(t *testing.T) {
newErr := Join(errmy, "i'm wrapped", errors.New("bla"))
assert.ErrorIs(t, newErr, errmy)
var joinErr *joinError
errors.As(newErr, &joinErr)
assert.ErrorIs(t, joinErr.err, errmy)
assert.Len(t, joinErr.errs, 2)
}
func TestJoinError_Error(t *testing.T) {
err1 := New("err1")
err2 := New("err2")
for name, test := range map[string]struct {
err error
errs []any
want string
}{
"empty": {
err: err1,
errs: []any{},
want: "err1",
},
"err_ele": {
err: err1,
errs: []any{err2, "a_string"},
want: "err1: err2 + a_string",
},
"nil_elem": {
err: err1,
errs: []any{nil, err2},
want: "err1: err2",
},
"sub_join": {
err: err1,
errs: []any{Join(err2, "sub")},
want: "err1: err2: sub",
},
} {
t.Run(name, func(t *testing.T) {
got := Join(test.err, test.errs...).Error()
assert.Equal(t, test.want, got)
})
}
}
func TestJoinError_LogValueMethod(t *testing.T) {
err1 := New("err1")
err2 := New("err2")
for name, test := range map[string]struct {
err error
errs []any
wantMessage string
wantStack string
wantStackLength int
wantValues map[string]any
}{
"empty": {
err: err1,
errs: []any{},
wantMessage: "err1",
wantStack: `github.com/emilien-puget/xerrors.TestJoinError_LogValueMethod join_test.go:66
testing.tRunner testing.go:1595
runtime.goexit asm_amd64.s:1650`,
wantStackLength: 3,
wantValues: map[string]any{},
},
"err_ele": {
err: err1,
errs: []any{err2, "a_string"},
wantMessage: "err1: err2 + a_string",
wantStack: `github.com/emilien-puget/xerrors.TestJoinError_LogValueMethod join_test.go:66
testing.tRunner testing.go:1595
runtime.goexit asm_amd64.s:1650`,
wantStackLength: 3,
wantValues: map[string]any{},
},
"nil_elem": {
err: err1,
errs: []any{nil, err2},
wantMessage: "err1: err2",
wantStack: `github.com/emilien-puget/xerrors.TestJoinError_LogValueMethod join_test.go:66
testing.tRunner testing.go:1595
runtime.goexit asm_amd64.s:1650`,
wantStackLength: 3,
wantValues: map[string]any{},
},
"sub_join": {
err: err1,
errs: []any{Join(err2, "sub")},
wantMessage: "err1: err2: sub",
wantStack: `github.com/emilien-puget/xerrors.TestJoinError_LogValueMethod join_test.go:66
testing.tRunner testing.go:1595
runtime.goexit asm_amd64.s:1650`,
wantStackLength: 3,
wantValues: map[string]any{},
},
"values": {
err: err1,
errs: []any{nil, err2, WithValue("one", "two")},
wantMessage: "err1: err2",
wantStack: `github.com/emilien-puget/xerrors.TestJoinError_LogValueMethod join_test.go:66
testing.tRunner testing.go:1595
runtime.goexit asm_amd64.s:1650`,
wantStackLength: 3,
wantValues: map[string]any{"one": "two"},
},
} {
t.Run(name, func(t *testing.T) {
newErr := Join(test.err, test.errs...)
var buf bytes.Buffer
h := slog.NewJSONHandler(&buf, nil)
logger := slog.New(h)
logger.Info("test", slog.Any("error", newErr))
var ms []map[string]any
for _, line := range bytes.Split(buf.Bytes(), []byte{'\n'}) {
if len(line) == 0 {
continue
}
var m map[string]any
if err := json.Unmarshal(line, &m); err != nil {
panic(err) // In a real test, use t.Fatal.
}
ms = append(ms, m)
}
require.Len(t, ms, 1)
require.Contains(t, ms[0], "error")
require.IsType(t, map[string]any{}, ms[0]["error"])
a := ms[0]["error"].(map[string]any)
assert.Len(t, a, 3)
assert.NotEmpty(t, a["stacktrace"])
assert.Equal(t, test.wantMessage, a["message"])
assert.Equal(t, test.wantValues, a["values"])
})
}
}