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is_test.go
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is_test.go
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package errors
import (
"errors"
"fmt"
"testing"
"io/fs"
"github.com/stretchr/testify/require"
)
var (
ErrInvalid = fs.ErrInvalid // "invalid argument"
)
type isErrorWrapTestCase struct {
about string
preCondition []interface{}
testCase map[error]bool
}
func getIsErrorWrapTestCases() []isErrorWrapTestCase {
return []isErrorWrapTestCase{
{
about: "wrapping all errors",
preCondition: []interface{}{
New("500", "This is a very big error! Beware of it!"),
New("", "This is a very big error! Beware of it!"),
New("401", ""),
errors.New("error created from err package"),
fmt.Errorf("%s", "error created from fmt package"),
nil,
},
testCase: map[error]bool{
New("500", "This is a very big error! Beware of it!"): true,
},
},
{
about: "wrapping error with nil error",
preCondition: []interface{}{
New("500", "This is a very big error! Beware of it!"),
nil,
errors.New(""),
},
testCase: map[error]bool{
New("500", "This is a very big error! Beware of it!"): true,
new("500", "This is a very big error! Beware of it!!!!!"): true,
},
},
{
about: "wrapping error with nil error",
preCondition: []interface{}{
New("500", "This is a very big error! Beware of it!"),
},
testCase: map[error]bool{
New("500", "This is a very big error! Beware of it!"): true,
},
},
}
}
type isErrorTestCase struct {
about string
actualError error
targetError error
expected bool
}
func isErrorTestCases() []isErrorTestCase {
return []isErrorTestCase{
{
about: "actual error and target Error",
actualError: errors.New("actual error"),
targetError: New("", "actual error"),
expected: false,
},
{
about: "actual error and target error",
actualError: ErrInvalid,
targetError: ErrInvalid,
expected: true,
},
{
about: "actual error and target nil",
actualError: ErrInvalid,
targetError: nil,
expected: false,
},
{
about: "actual nil and target error",
actualError: nil,
targetError: ErrInvalid,
expected: false,
},
{
about: "actual withError and target error",
actualError: Wrap(Wrap(New("", "actual error"), "wrapped error1"), "wrapped error2"),
targetError: New("", "wrapped error1"),
expected: true,
},
}
}
func TestIs(t *testing.T) {
for _, gtc := range getIsErrorWrapTestCases() {
t.Run(gtc.about, func(t *testing.T) {
var wrappedError error
for _, tc := range gtc.preCondition {
wrappedError = Wrap(wrappedError, tc)
}
for k, v := range gtc.testCase {
require.Equal(t, v, Is(wrappedError, k))
}
})
}
for _, iet := range isErrorTestCases() {
t.Run(iet.about, func(t *testing.T) {
require.Equal(t, iet.expected, Is(iet.actualError, iet.targetError))
})
}
}