forked from uber-go/zap
/
encoder_test.go
661 lines (636 loc) · 21.1 KB
/
encoder_test.go
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// Copyright (c) 2016 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package zapcore_test
import (
"encoding/json"
"strings"
"testing"
"time"
"gopkg.in/yaml.v2"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
. "go.uber.org/zap/zapcore"
)
var (
_epoch = time.Date(1970, time.January, 1, 0, 0, 0, 0, time.UTC)
_testEntry = Entry{
LoggerName: "main",
Level: InfoLevel,
Message: `hello`,
Time: _epoch,
Stack: "fake-stack",
Caller: EntryCaller{Defined: true, File: "foo.go", Line: 42},
}
)
func testEncoderConfig() EncoderConfig {
return EncoderConfig{
MessageKey: "msg",
LevelKey: "level",
NameKey: "name",
TimeKey: "ts",
CallerKey: "caller",
StacktraceKey: "stacktrace",
LineEnding: "\n",
EncodeTime: EpochTimeEncoder,
EncodeLevel: LowercaseLevelEncoder,
EncodeDuration: SecondsDurationEncoder,
EncodeCaller: ShortCallerEncoder,
}
}
func humanEncoderConfig() EncoderConfig {
cfg := testEncoderConfig()
cfg.EncodeTime = ISO8601TimeEncoder
cfg.EncodeLevel = CapitalLevelEncoder
cfg.EncodeDuration = StringDurationEncoder
return cfg
}
func capitalNameEncoder(loggerName string, enc PrimitiveArrayEncoder) {
enc.AppendString(strings.ToUpper(loggerName))
}
func TestEncoderConfiguration(t *testing.T) {
base := testEncoderConfig()
tests := []struct {
desc string
cfg EncoderConfig
amendEntry func(Entry) Entry
extra func(Encoder)
expectedJSON string
expectedConsole string
}{
{
desc: "messages to be escaped",
cfg: base,
amendEntry: func(ent Entry) Entry {
ent.Message = `hello\`
return ent
},
expectedJSON: `{"level":"info","ts":0,"name":"main","caller":"foo.go:42","msg":"hello\\","stacktrace":"fake-stack"}` + "\n",
expectedConsole: "0\tinfo\tmain\tfoo.go:42\thello\\\nfake-stack\n",
},
{
desc: "use custom entry keys in JSON output and ignore them in console output",
cfg: EncoderConfig{
LevelKey: "L",
TimeKey: "T",
MessageKey: "M",
NameKey: "N",
CallerKey: "C",
StacktraceKey: "S",
LineEnding: base.LineEnding,
EncodeTime: base.EncodeTime,
EncodeDuration: base.EncodeDuration,
EncodeLevel: base.EncodeLevel,
EncodeCaller: base.EncodeCaller,
},
expectedJSON: `{"L":"info","T":0,"N":"main","C":"foo.go:42","M":"hello","S":"fake-stack"}` + "\n",
expectedConsole: "0\tinfo\tmain\tfoo.go:42\thello\nfake-stack\n",
},
{
desc: "skip level if LevelKey is omitted",
cfg: EncoderConfig{
LevelKey: OmitKey,
TimeKey: "T",
MessageKey: "M",
NameKey: "N",
CallerKey: "C",
StacktraceKey: "S",
LineEnding: base.LineEnding,
EncodeTime: base.EncodeTime,
EncodeDuration: base.EncodeDuration,
EncodeLevel: base.EncodeLevel,
EncodeCaller: base.EncodeCaller,
},
expectedJSON: `{"T":0,"N":"main","C":"foo.go:42","M":"hello","S":"fake-stack"}` + "\n",
expectedConsole: "0\tmain\tfoo.go:42\thello\nfake-stack\n",
},
{
desc: "skip timestamp if TimeKey is omitted",
cfg: EncoderConfig{
LevelKey: "L",
TimeKey: OmitKey,
MessageKey: "M",
NameKey: "N",
CallerKey: "C",
StacktraceKey: "S",
LineEnding: base.LineEnding,
EncodeTime: base.EncodeTime,
EncodeDuration: base.EncodeDuration,
EncodeLevel: base.EncodeLevel,
EncodeCaller: base.EncodeCaller,
},
expectedJSON: `{"L":"info","N":"main","C":"foo.go:42","M":"hello","S":"fake-stack"}` + "\n",
expectedConsole: "info\tmain\tfoo.go:42\thello\nfake-stack\n",
},
{
desc: "skip message if MessageKey is omitted",
cfg: EncoderConfig{
LevelKey: "L",
TimeKey: "T",
MessageKey: OmitKey,
NameKey: "N",
CallerKey: "C",
StacktraceKey: "S",
LineEnding: base.LineEnding,
EncodeTime: base.EncodeTime,
EncodeDuration: base.EncodeDuration,
EncodeLevel: base.EncodeLevel,
EncodeCaller: base.EncodeCaller,
},
expectedJSON: `{"L":"info","T":0,"N":"main","C":"foo.go:42","S":"fake-stack"}` + "\n",
expectedConsole: "0\tinfo\tmain\tfoo.go:42\nfake-stack\n",
},
{
desc: "skip name if NameKey is omitted",
cfg: EncoderConfig{
LevelKey: "L",
TimeKey: "T",
MessageKey: "M",
NameKey: OmitKey,
CallerKey: "C",
StacktraceKey: "S",
LineEnding: base.LineEnding,
EncodeTime: base.EncodeTime,
EncodeDuration: base.EncodeDuration,
EncodeLevel: base.EncodeLevel,
EncodeCaller: base.EncodeCaller,
},
expectedJSON: `{"L":"info","T":0,"C":"foo.go:42","M":"hello","S":"fake-stack"}` + "\n",
expectedConsole: "0\tinfo\tfoo.go:42\thello\nfake-stack\n",
},
{
desc: "skip caller if CallerKey is omitted",
cfg: EncoderConfig{
LevelKey: "L",
TimeKey: "T",
MessageKey: "M",
NameKey: "N",
CallerKey: OmitKey,
StacktraceKey: "S",
LineEnding: base.LineEnding,
EncodeTime: base.EncodeTime,
EncodeDuration: base.EncodeDuration,
EncodeLevel: base.EncodeLevel,
EncodeCaller: base.EncodeCaller,
},
expectedJSON: `{"L":"info","T":0,"N":"main","M":"hello","S":"fake-stack"}` + "\n",
expectedConsole: "0\tinfo\tmain\thello\nfake-stack\n",
},
{
desc: "skip stacktrace if StacktraceKey is omitted",
cfg: EncoderConfig{
LevelKey: "L",
TimeKey: "T",
MessageKey: "M",
NameKey: "N",
CallerKey: "C",
StacktraceKey: OmitKey,
LineEnding: base.LineEnding,
EncodeTime: base.EncodeTime,
EncodeDuration: base.EncodeDuration,
EncodeLevel: base.EncodeLevel,
EncodeCaller: base.EncodeCaller,
},
expectedJSON: `{"L":"info","T":0,"N":"main","C":"foo.go:42","M":"hello"}` + "\n",
expectedConsole: "0\tinfo\tmain\tfoo.go:42\thello\n",
},
{
desc: "use the supplied EncodeTime, for both the entry and any times added",
cfg: EncoderConfig{
LevelKey: "L",
TimeKey: "T",
MessageKey: "M",
NameKey: "N",
CallerKey: "C",
StacktraceKey: "S",
LineEnding: base.LineEnding,
EncodeTime: func(t time.Time, enc PrimitiveArrayEncoder) { enc.AppendString(t.String()) },
EncodeDuration: base.EncodeDuration,
EncodeLevel: base.EncodeLevel,
EncodeCaller: base.EncodeCaller,
},
extra: func(enc Encoder) {
enc.AddTime("extra", _epoch)
enc.AddArray("extras", ArrayMarshalerFunc(func(enc ArrayEncoder) error {
enc.AppendTime(_epoch)
return nil
}))
},
expectedJSON: `{"L":"info","T":"1970-01-01 00:00:00 +0000 UTC","N":"main","C":"foo.go:42","M":"hello","extra":"1970-01-01 00:00:00 +0000 UTC","extras":["1970-01-01 00:00:00 +0000 UTC"],"S":"fake-stack"}` + "\n",
expectedConsole: "1970-01-01 00:00:00 +0000 UTC\tinfo\tmain\tfoo.go:42\thello\t" + // plain-text preamble
`{"extra": "1970-01-01 00:00:00 +0000 UTC", "extras": ["1970-01-01 00:00:00 +0000 UTC"]}` + // JSON context
"\nfake-stack\n", // stacktrace after newline
},
{
desc: "use the supplied EncodeDuration for any durations added",
cfg: EncoderConfig{
LevelKey: "L",
TimeKey: "T",
MessageKey: "M",
NameKey: "N",
CallerKey: "C",
StacktraceKey: "S",
LineEnding: base.LineEnding,
EncodeTime: base.EncodeTime,
EncodeDuration: StringDurationEncoder,
EncodeLevel: base.EncodeLevel,
EncodeCaller: base.EncodeCaller,
},
extra: func(enc Encoder) {
enc.AddDuration("extra", time.Second)
enc.AddArray("extras", ArrayMarshalerFunc(func(enc ArrayEncoder) error {
enc.AppendDuration(time.Minute)
return nil
}))
},
expectedJSON: `{"L":"info","T":0,"N":"main","C":"foo.go:42","M":"hello","extra":"1s","extras":["1m0s"],"S":"fake-stack"}` + "\n",
expectedConsole: "0\tinfo\tmain\tfoo.go:42\thello\t" + // preamble
`{"extra": "1s", "extras": ["1m0s"]}` + // context
"\nfake-stack\n", // stacktrace
},
{
desc: "use the supplied EncodeLevel",
cfg: EncoderConfig{
LevelKey: "L",
TimeKey: "T",
MessageKey: "M",
NameKey: "N",
CallerKey: "C",
StacktraceKey: "S",
LineEnding: base.LineEnding,
EncodeTime: base.EncodeTime,
EncodeDuration: base.EncodeDuration,
EncodeLevel: CapitalLevelEncoder,
EncodeCaller: base.EncodeCaller,
},
expectedJSON: `{"L":"INFO","T":0,"N":"main","C":"foo.go:42","M":"hello","S":"fake-stack"}` + "\n",
expectedConsole: "0\tINFO\tmain\tfoo.go:42\thello\nfake-stack\n",
},
{
desc: "use the supplied EncodeName",
cfg: EncoderConfig{
LevelKey: "L",
TimeKey: "T",
MessageKey: "M",
NameKey: "N",
CallerKey: "C",
StacktraceKey: "S",
LineEnding: base.LineEnding,
EncodeTime: base.EncodeTime,
EncodeDuration: base.EncodeDuration,
EncodeLevel: base.EncodeLevel,
EncodeCaller: base.EncodeCaller,
EncodeName: capitalNameEncoder,
},
expectedJSON: `{"L":"info","T":0,"N":"MAIN","C":"foo.go:42","M":"hello","S":"fake-stack"}` + "\n",
expectedConsole: "0\tinfo\tMAIN\tfoo.go:42\thello\nfake-stack\n",
},
{
desc: "close all open namespaces",
cfg: EncoderConfig{
LevelKey: "L",
TimeKey: "T",
MessageKey: "M",
NameKey: "N",
CallerKey: "C",
StacktraceKey: "S",
LineEnding: base.LineEnding,
EncodeTime: base.EncodeTime,
EncodeDuration: base.EncodeDuration,
EncodeLevel: base.EncodeLevel,
EncodeCaller: base.EncodeCaller,
},
extra: func(enc Encoder) {
enc.OpenNamespace("outer")
enc.OpenNamespace("inner")
enc.AddString("foo", "bar")
enc.OpenNamespace("innermost")
},
expectedJSON: `{"L":"info","T":0,"N":"main","C":"foo.go:42","M":"hello","outer":{"inner":{"foo":"bar","innermost":{}}},"S":"fake-stack"}` + "\n",
expectedConsole: "0\tinfo\tmain\tfoo.go:42\thello\t" +
`{"outer": {"inner": {"foo": "bar", "innermost": {}}}}` +
"\nfake-stack\n",
},
{
desc: "handle no-op EncodeTime",
cfg: EncoderConfig{
LevelKey: "L",
TimeKey: "T",
MessageKey: "M",
NameKey: "N",
CallerKey: "C",
StacktraceKey: "S",
LineEnding: base.LineEnding,
EncodeTime: func(time.Time, PrimitiveArrayEncoder) {},
EncodeDuration: base.EncodeDuration,
EncodeLevel: base.EncodeLevel,
EncodeCaller: base.EncodeCaller,
},
extra: func(enc Encoder) { enc.AddTime("sometime", time.Unix(0, 100)) },
expectedJSON: `{"L":"info","T":0,"N":"main","C":"foo.go:42","M":"hello","sometime":100,"S":"fake-stack"}` + "\n",
expectedConsole: "info\tmain\tfoo.go:42\thello\t" + `{"sometime": 100}` + "\nfake-stack\n",
},
{
desc: "handle no-op EncodeDuration",
cfg: EncoderConfig{
LevelKey: "L",
TimeKey: "T",
MessageKey: "M",
NameKey: "N",
CallerKey: "C",
StacktraceKey: "S",
LineEnding: base.LineEnding,
EncodeTime: base.EncodeTime,
EncodeDuration: func(time.Duration, PrimitiveArrayEncoder) {},
EncodeLevel: base.EncodeLevel,
EncodeCaller: base.EncodeCaller,
},
extra: func(enc Encoder) { enc.AddDuration("someduration", time.Microsecond) },
expectedJSON: `{"L":"info","T":0,"N":"main","C":"foo.go:42","M":"hello","someduration":1000,"S":"fake-stack"}` + "\n",
expectedConsole: "0\tinfo\tmain\tfoo.go:42\thello\t" + `{"someduration": 1000}` + "\nfake-stack\n",
},
{
desc: "handle no-op EncodeLevel",
cfg: EncoderConfig{
LevelKey: "L",
TimeKey: "T",
MessageKey: "M",
NameKey: "N",
CallerKey: "C",
StacktraceKey: "S",
LineEnding: base.LineEnding,
EncodeTime: base.EncodeTime,
EncodeDuration: base.EncodeDuration,
EncodeLevel: func(Level, PrimitiveArrayEncoder) {},
EncodeCaller: base.EncodeCaller,
},
expectedJSON: `{"L":"info","T":0,"N":"main","C":"foo.go:42","M":"hello","S":"fake-stack"}` + "\n",
expectedConsole: "0\tmain\tfoo.go:42\thello\nfake-stack\n",
},
{
desc: "handle no-op EncodeCaller",
cfg: EncoderConfig{
LevelKey: "L",
TimeKey: "T",
MessageKey: "M",
NameKey: "N",
CallerKey: "C",
StacktraceKey: "S",
LineEnding: base.LineEnding,
EncodeTime: base.EncodeTime,
EncodeDuration: base.EncodeDuration,
EncodeLevel: base.EncodeLevel,
EncodeCaller: func(EntryCaller, PrimitiveArrayEncoder) {},
},
expectedJSON: `{"L":"info","T":0,"N":"main","C":"foo.go:42","M":"hello","S":"fake-stack"}` + "\n",
expectedConsole: "0\tinfo\tmain\thello\nfake-stack\n",
},
{
desc: "handle no-op EncodeName",
cfg: EncoderConfig{
LevelKey: "L",
TimeKey: "T",
MessageKey: "M",
NameKey: "N",
CallerKey: "C",
StacktraceKey: "S",
LineEnding: base.LineEnding,
EncodeTime: base.EncodeTime,
EncodeDuration: base.EncodeDuration,
EncodeLevel: base.EncodeLevel,
EncodeCaller: base.EncodeCaller,
EncodeName: func(string, PrimitiveArrayEncoder) {},
},
expectedJSON: `{"L":"info","T":0,"N":"main","C":"foo.go:42","M":"hello","S":"fake-stack"}` + "\n",
expectedConsole: "0\tinfo\tfoo.go:42\thello\nfake-stack\n",
},
{
desc: "use custom line separator",
cfg: EncoderConfig{
LevelKey: "L",
TimeKey: "T",
MessageKey: "M",
NameKey: "N",
CallerKey: "C",
StacktraceKey: "S",
LineEnding: "\r\n",
EncodeTime: base.EncodeTime,
EncodeDuration: base.EncodeDuration,
EncodeLevel: base.EncodeLevel,
EncodeCaller: base.EncodeCaller,
},
expectedJSON: `{"L":"info","T":0,"N":"main","C":"foo.go:42","M":"hello","S":"fake-stack"}` + "\r\n",
expectedConsole: "0\tinfo\tmain\tfoo.go:42\thello\nfake-stack\r\n",
},
{
desc: "omit line separator definition - fall back to default",
cfg: EncoderConfig{
LevelKey: "L",
TimeKey: "T",
MessageKey: "M",
NameKey: "N",
CallerKey: "C",
StacktraceKey: "S",
EncodeTime: base.EncodeTime,
EncodeDuration: base.EncodeDuration,
EncodeLevel: base.EncodeLevel,
EncodeCaller: base.EncodeCaller,
},
expectedJSON: `{"L":"info","T":0,"N":"main","C":"foo.go:42","M":"hello","S":"fake-stack"}` + DefaultLineEnding,
expectedConsole: "0\tinfo\tmain\tfoo.go:42\thello\nfake-stack" + DefaultLineEnding,
},
}
for i, tt := range tests {
json := NewJSONEncoder(tt.cfg)
console := NewConsoleEncoder(tt.cfg)
if tt.extra != nil {
tt.extra(json)
tt.extra(console)
}
entry := _testEntry
if tt.amendEntry != nil {
entry = tt.amendEntry(_testEntry)
}
jsonOut, jsonErr := json.EncodeEntry(entry, nil)
if assert.NoError(t, jsonErr, "Unexpected error JSON-encoding entry in case #%d.", i) {
assert.Equal(
t,
tt.expectedJSON,
jsonOut.String(),
"Unexpected JSON output: expected to %v.", tt.desc,
)
}
consoleOut, consoleErr := console.EncodeEntry(entry, nil)
if assert.NoError(t, consoleErr, "Unexpected error console-encoding entry in case #%d.", i) {
assert.Equal(
t,
tt.expectedConsole,
consoleOut.String(),
"Unexpected console output: expected to %v.", tt.desc,
)
}
}
}
func TestLevelEncoders(t *testing.T) {
tests := []struct {
name string
expected interface{} // output of encoding InfoLevel
}{
{"capital", "INFO"},
{"lower", "info"},
{"", "info"},
{"something-random", "info"},
}
for _, tt := range tests {
var le LevelEncoder
require.NoError(t, le.UnmarshalText([]byte(tt.name)), "Unexpected error unmarshaling %q.", tt.name)
assertAppended(
t,
tt.expected,
func(arr ArrayEncoder) { le(InfoLevel, arr) },
"Unexpected output serializing InfoLevel with %q.", tt.name,
)
}
}
func TestTimeEncoders(t *testing.T) {
moment := time.Unix(100, 50005000).UTC()
tests := []struct {
yamlDoc string
expected interface{} // output of serializing moment
}{
{"timeEncoder: iso8601", "1970-01-01T00:01:40.050Z"},
{"timeEncoder: ISO8601", "1970-01-01T00:01:40.050Z"},
{"timeEncoder: millis", 100050.005},
{"timeEncoder: nanos", int64(100050005000)},
{"timeEncoder: {layout: 06/01/02 03:04pm}", "70/01/01 12:01am"},
{"timeEncoder: ''", 100.050005},
{"timeEncoder: something-random", 100.050005},
{"timeEncoder: rfc3339", "1970-01-01T00:01:40Z"},
{"timeEncoder: RFC3339", "1970-01-01T00:01:40Z"},
{"timeEncoder: rfc3339nano", "1970-01-01T00:01:40.050005Z"},
{"timeEncoder: RFC3339Nano", "1970-01-01T00:01:40.050005Z"},
}
for _, tt := range tests {
cfg := EncoderConfig{}
require.NoError(t, yaml.Unmarshal([]byte(tt.yamlDoc), &cfg), "Unexpected error unmarshaling %q.", tt.yamlDoc)
require.NotNil(t, cfg.EncodeTime, "Unmashalled timeEncoder is nil for %q.", tt.yamlDoc)
assertAppended(
t,
tt.expected,
func(arr ArrayEncoder) { cfg.EncodeTime(moment, arr) },
"Unexpected output serializing %v with %q.", moment, tt.yamlDoc,
)
}
}
func TestTimeEncodersParseFromJson(t *testing.T) {
moment := time.Unix(100, 50005000).UTC()
tests := []struct {
jsonDoc string
expected interface{} // output of serializing moment
}{
{`{"timeEncoder": "iso8601"}`, "1970-01-01T00:01:40.050Z"},
{`{"timeEncoder": {"layout": "06/01/02 03:04pm"}}`, "70/01/01 12:01am"},
}
for _, tt := range tests {
cfg := EncoderConfig{}
require.NoError(t, json.Unmarshal([]byte(tt.jsonDoc), &cfg), "Unexpected error unmarshaling %q.", tt.jsonDoc)
require.NotNil(t, cfg.EncodeTime, "Unmashalled timeEncoder is nil for %q.", tt.jsonDoc)
assertAppended(
t,
tt.expected,
func(arr ArrayEncoder) { cfg.EncodeTime(moment, arr) },
"Unexpected output serializing %v with %q.", moment, tt.jsonDoc,
)
}
}
func TestDurationEncoders(t *testing.T) {
elapsed := time.Second + 500*time.Nanosecond
tests := []struct {
name string
expected interface{} // output of serializing elapsed
}{
{"string", "1.0000005s"},
{"nanos", int64(1000000500)},
{"ms", int64(1000)},
{"", 1.0000005},
{"something-random", 1.0000005},
}
for _, tt := range tests {
var de DurationEncoder
require.NoError(t, de.UnmarshalText([]byte(tt.name)), "Unexpected error unmarshaling %q.", tt.name)
assertAppended(
t,
tt.expected,
func(arr ArrayEncoder) { de(elapsed, arr) },
"Unexpected output serializing %v with %q.", elapsed, tt.name,
)
}
}
func TestCallerEncoders(t *testing.T) {
caller := EntryCaller{Defined: true, File: "/home/jack/src/github.com/foo/foo.go", Line: 42}
tests := []struct {
name string
expected interface{} // output of serializing caller
}{
{"", "foo/foo.go:42"},
{"something-random", "foo/foo.go:42"},
{"short", "foo/foo.go:42"},
{"full", "/home/jack/src/github.com/foo/foo.go:42"},
}
for _, tt := range tests {
var ce CallerEncoder
require.NoError(t, ce.UnmarshalText([]byte(tt.name)), "Unexpected error unmarshaling %q.", tt.name)
assertAppended(
t,
tt.expected,
func(arr ArrayEncoder) { ce(caller, arr) },
"Unexpected output serializing file name as %v with %q.", tt.expected, tt.name,
)
}
}
func TestNameEncoders(t *testing.T) {
tests := []struct {
name string
expected interface{} // output of encoding InfoLevel
}{
{"", "main"},
{"full", "main"},
{"something-random", "main"},
}
for _, tt := range tests {
var ne NameEncoder
require.NoError(t, ne.UnmarshalText([]byte(tt.name)), "Unexpected error unmarshaling %q.", tt.name)
assertAppended(
t,
tt.expected,
func(arr ArrayEncoder) { ne("main", arr) },
"Unexpected output serializing logger name with %q.", tt.name,
)
}
}
func assertAppended(t testing.TB, expected interface{}, f func(ArrayEncoder), msgAndArgs ...interface{}) {
mem := NewMapObjectEncoder()
mem.AddArray("k", ArrayMarshalerFunc(func(arr ArrayEncoder) error {
f(arr)
return nil
}))
arr := mem.Fields["k"].([]interface{})
require.Equal(t, 1, len(arr), "Expected to append exactly one element to array.")
assert.Equal(t, expected, arr[0], msgAndArgs...)
}