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-rw-r--r--plugin/cache/error_test.go38
-rw-r--r--plugin/cache/spoof_test.go2
2 files changed, 39 insertions, 1 deletions
diff --git a/plugin/cache/error_test.go b/plugin/cache/error_test.go
new file mode 100644
index 000000000..7ae603e10
--- /dev/null
+++ b/plugin/cache/error_test.go
@@ -0,0 +1,38 @@
+package cache
+
+import (
+ "context"
+ "testing"
+
+ "github.com/coredns/coredns/plugin"
+ "github.com/coredns/coredns/plugin/pkg/dnstest"
+ "github.com/coredns/coredns/plugin/test"
+
+ "github.com/miekg/dns"
+)
+
+func TestFormErr(t *testing.T) {
+ c := New()
+ c.Next = formErrHandler()
+
+ req := new(dns.Msg)
+ req.SetQuestion("example.org.", dns.TypeA)
+ rec := dnstest.NewRecorder(&test.ResponseWriter{})
+
+ c.ServeDNS(context.TODO(), rec, req)
+
+ if c.pcache.Len() != 0 {
+ t.Errorf("Cached %s, while reply had %d", "example.org.", rec.Msg.Rcode)
+ }
+}
+
+// formErrHanlder is a fake plugin implementation which returns a FORMERR for a reply.
+func formErrHandler() plugin.Handler {
+ return plugin.HandlerFunc(func(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
+ m := new(dns.Msg)
+ m.SetQuestion("example.net.", dns.TypeA)
+ m.Rcode = dns.RcodeFormatError
+ w.WriteMsg(m)
+ return dns.RcodeSuccess, nil
+ })
+}
diff --git a/plugin/cache/spoof_test.go b/plugin/cache/spoof_test.go
index 04d714f4a..20d7e8d51 100644
--- a/plugin/cache/spoof_test.go
+++ b/plugin/cache/spoof_test.go
@@ -6,8 +6,8 @@ import (
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/pkg/dnstest"
-
"github.com/coredns/coredns/plugin/test"
+
"github.com/miekg/dns"
)