Add tests for types with custom Error interface.

1 files changed, 7 insertions, 0 deletions

diff --git a/spew/common_test.go b/spew/common_test.go
index 78b1f81..f0119e6 100644
--- a/spew/common_test.go
+++ b/spew/common_test.go
@@ -58,6 +58,13 @@ func (p panicer) String() string {
 	panic("test panic")
 }
 
+// customError is used to test custom error interface invocation.
+type customError int
+
+func (e customError) Error() string {
+	return fmt.Sprintf("error: %d", int(e))
+}
+
 // stringizeWants converts a slice of wanted test output into a format suitable
 // for an test error message.
 func stringizeWants(wants []string) string {