improve test coverage, error reporting for Select()

1 files changed, 8 insertions, 0 deletions

diff --git a/internal/assert/assert.go b/internal/assert/assert.go
index 26f91ff..6e641ca 100644
--- a/internal/assert/assert.go
+++ b/internal/assert/assert.go
@@ -4,6 +4,8 @@
 package assert
 
 import (
+	"cmp"
+	"errors"
 	"reflect"
 	"testing"
 )
@@ -26,6 +28,12 @@ func DeepEqual[V any](t testing.TB, actual, expected V) {
 	}
 }
 
+// ErrEqual is a test assertion.
+func ErrEqual(t testing.TB, actual error, expected string) {
+	t.Helper()
+	Equal(t, cmp.Or(actual, errors.New("<success>")).Error(), expected)
+}
+
 // SliceEqual is a test assertion.
 func SliceEqual[V comparable](t testing.TB, actual []V, expected ...V) {
 	t.Helper()