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// Copyright (c) The EfficientGo Authors.
// Licensed under the Apache License 2.0.
// Initially copied from Thanos and contributed by https://github.com/bisakhmondal.
//
// Copyright (c) The Thanos Authors.
// Licensed under the Apache License 2.0.
package errors_test
import (
//lint:ignore faillint Custom errors package tests need to import standard library errors.
stderrors "errors"
"fmt"
"regexp"
"testing"
"github.com/efficientgo/core/errors"
"github.com/efficientgo/core/testutil"
)
func ExampleWrap() {
if err := func() error {
// Do something...
return errors.New("error!")
}(); err != nil {
wrapped := errors.Wrap(err, "doing something")
fmt.Println(wrapped)
}
// Output: doing something: error!
}
func ExampleWrapf() {
if err := func() error {
// Do something...
return errors.Newf("I am surprised %d + %d equals %v", 2, 3, 5)
}(); err != nil {
wrapped := errors.Wrapf(err, "doing some math %v times", 10)
fmt.Println(wrapped)
}
// Output: doing some math 10 times: I am surprised 2 + 3 equals 5
}
const msg = "test_error_message"
const wrapper = "test_wrapper"
func TestNew(t *testing.T) {
err := errors.New(msg)
testutil.NotOk(t, err)
testutil.Equals(t, err.Error(), msg, "the root error message must match")
// The %+v triggers stacktrace print.
reg := regexp.MustCompile(msg + `[ \n]+> github\.com\/efficientgo\/core\/errors_test\.TestNew .*\/errors\/errors_test\.go:\d+`)
testutil.Assert(t, reg.MatchString(fmt.Sprintf("%+v", err)), "matching stacktrace in errors.New")
}
func TestNewf(t *testing.T) {
fmtMsg := msg + " key=%v"
expectedMsg := msg + " key=value"
err := errors.Newf(fmtMsg, "value")
testutil.NotOk(t, err)
testutil.Equals(t, err.Error(), expectedMsg, "the root error message must match")
reg := regexp.MustCompile(expectedMsg + `[ \n]+> github\.com\/efficientgo\/core\/errors_test\.TestNewf .*\/errors\/errors_test\.go:\d+`)
testutil.Assert(t, reg.MatchString(fmt.Sprintf("%+v", err)), "matching stacktrace in errors.Newf")
}
func TestWrap(t *testing.T) {
err := errors.New(msg)
err = errors.Wrap(err, wrapper)
testutil.NotOk(t, err)
expectedMsg := wrapper + ": " + msg
testutil.Equals(t, err.Error(), expectedMsg, "the root error message must match")
reg := regexp.MustCompile(`test_wrapper[ \n]+> github\.com\/efficientgo\/core\/errors_test\.TestWrap .*\/errors\/errors_test\.go:\d+
[[:ascii:]]+test_error_message[ \n]+> github\.com\/efficientgo\/core\/errors_test\.TestWrap .*\/errors\/errors_test\.go:\d+`)
testutil.Assert(t, reg.MatchString(fmt.Sprintf("%+v", err)), "not matching stacktrace in errors.Wrap")
testutil.Ok(t, errors.Wrap(nil, wrapper))
}
func TestWrapf(t *testing.T) {
err := errors.New(msg)
fmtWrapper := wrapper + " key=%v"
err = errors.Wrapf(err, fmtWrapper, "value")
testutil.NotOk(t, err)
expectedMsg := wrapper + " key=value: " + msg
testutil.Equals(t, err.Error(), expectedMsg, "the root error message must match")
reg := regexp.MustCompile(`[ \n]+> github\.com\/efficientgo\/core\/errors_test\.TestWrapf .*\/errors\/errors_test\.go:\d+
[[:ascii:]]+test_error_message[ \n]+> github\.com\/efficientgo\/core\/errors_test\.TestWrapf .*\/errors\/errors_test\.go:\d+`)
testutil.Assert(t, reg.MatchString(fmt.Sprintf("%+v", err)), "not matching stacktrace in errors.Wrapf")
testutil.Ok(t, errors.Wrapf(nil, fmtWrapper))
}
func TestUnwrap(t *testing.T) {
baseErr := errors.Newf(msg)
for _, tc := range []struct {
err error
expectedUnwrap string
}{
{
err: baseErr,
},
{
err: errors.Wrap(baseErr, wrapper),
expectedUnwrap: "test_error_message",
},
{
err: errors.Wrap(errors.Wrap(baseErr, wrapper), wrapper),
expectedUnwrap: "test_wrapper: test_error_message",
},
{
err: stderrors.New("std-error"),
},
{
err: errors.Wrap(stderrors.New("std-error"), wrapper),
expectedUnwrap: "std-error",
},
{
err: nil,
},
} {
t.Run("", func(t *testing.T) {
unwrapped := errors.Unwrap(tc.err)
if tc.expectedUnwrap == "" {
testutil.Ok(t, unwrapped)
return
}
testutil.NotOk(t, unwrapped)
testutil.Equals(t, tc.expectedUnwrap, unwrapped.Error())
})
}
}
func TestCause(t *testing.T) {
baseErr := errors.Newf(msg)
for _, tc := range []struct {
err error
expectedCause string
}{
{
// no wrapping
err: baseErr,
},
{
err: errors.Wrap(baseErr, wrapper),
},
{
err: errors.Wrap(errors.Wrapf(baseErr, wrapper), wrapper),
},
{
err: stderrors.New("std-error"),
expectedCause: "std-error",
},
{
err: errors.Wrap(stderrors.New("std-error"), wrapper),
expectedCause: "std-error",
},
{
err: nil,
},
} {
t.Run("", func(t *testing.T) {
cause := errors.Cause(tc.err)
if tc.expectedCause == "" {
testutil.Ok(t, cause)
return
}
testutil.NotOk(t, cause)
testutil.Equals(t, tc.expectedCause, cause.Error())
})
}
}
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