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// Licensed under the MIT license, see LICENSE file for details.
package quicktest
import (
"errors"
"fmt"
)
// ErrorAs checks that the error is or wraps a specific error type. If so, it
// assigns it to the provided pointer. This is analogous to calling errors.As.
//
// For instance:
//
// // Checking for a specific error type
// c.Assert(err, qt.ErrorAs, new(*os.PathError))
//
// // Checking fields on a specific error type
// var pathError *os.PathError
// if c.Check(err, qt.ErrorAs, &pathError) {
// c.Assert(pathError.Path, qt.Equals, "some_path")
// }
var ErrorAs Checker = &errorAsChecker{
argNames: []string{"got", "as"},
}
type errorAsChecker struct {
argNames
}
// Check implements Checker.Check by checking that got is an error whose error
// chain matches args[0] and assigning it to args[0].
func (c *errorAsChecker) Check(got interface{}, args []interface{}, note func(key string, value interface{})) (err error) {
if err := checkFirstArgIsError(got, note); err != nil {
return err
}
gotErr := got.(error)
defer func() {
// A panic is raised when the target is not a pointer to an interface
// or error.
if r := recover(); r != nil {
err = BadCheckf("%s", r)
}
}()
as := args[0]
if errors.As(gotErr, as) {
return nil
}
note("error", Unquoted("wanted type is not found in error chain"))
note("got", gotErr)
note("as", Unquoted(fmt.Sprintf("%T", as)))
return ErrSilent
}
// ErrorIs checks that the error is or wraps a specific error value. This is
// analogous to calling errors.Is.
//
// For instance:
//
// c.Assert(err, qt.ErrorIs, os.ErrNotExist)
var ErrorIs Checker = &errorIsChecker{
argNames: []string{"got", "want"},
}
type errorIsChecker struct {
argNames
}
// Check implements Checker.Check by checking that got is an error whose error
// chain matches args[0].
func (c *errorIsChecker) Check(got interface{}, args []interface{}, note func(key string, value interface{})) error {
if got == nil && args[0] == nil {
return nil
}
if err := checkFirstArgIsError(got, note); err != nil {
return err
}
gotErr := got.(error)
wantErr, ok := args[0].(error)
if !ok && args[0] != nil {
note("want", args[0])
return BadCheckf("second argument is not an error")
}
if !errors.Is(gotErr, wantErr) {
return errors.New("wanted error is not found in error chain")
}
return nil
}
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