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add AsOfType helper fn #15

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Merged
Sypheos merged 1 commit into from
Oct 9, 2025
Merged

add AsOfType helper fn #15

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8 changes: 8 additions & 0 deletions cause_go118.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,8 @@

package errors

import "errors"

func IsOfType[T error](err error) bool {
for {
if _, ok := err.(T); ok || err == nil {
Expand All @@ -11,3 +13,9 @@ func IsOfType[T error](err error) bool {
err = Unwrap(err)
}
}

func AsType[T error](err error) (T, bool) {
var e T

return e, errors.As(err, &e)
}
32 changes: 32 additions & 0 deletions cause_go118_test.go
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Expand Up @@ -39,3 +39,35 @@ func TestIsOfType(t *testing.T) {
assert.Equal(t, tt.isMockError, IsOfType[mockError](tt.input))
}
}

func TestAsType(t *testing.T) {
for _, tt := range []struct {
name string
input error
expected error
}{
{
name: "nil error",
},
{
name: "mockError",
input: mockError{},
expected: mockError{},
},
{
name: "wrapped mockError",
input: Wrap(mockError{}, "wrapping"),
expected: mockError{},
},
} {
t.Run(tt.name, func(t *testing.T) {
m, ok := AsType[mockError](tt.input)

assert.Equal(t, tt.expected != nil, ok)

if ok {
assert.Equal(t, tt.expected, m)
}
})
}
}
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