pkg/pbutil: add marshal-related tests

pkg/pbutil/pbutil_test.go

@@ -16,7 +16,48 @@
 
 package pbutil
 
-import "testing"
+import (
+	"errors"
+	"reflect"
+	"testing"
+)
+
+func TestMarshaler(t *testing.T) {
+	data := []byte("test data")
+	m := &fakeMarshaler{data: data}
+	if g := MustMarshal(m); !reflect.DeepEqual(g, data) {
+		t.Errorf("data = %s, want %s", g, m)
+	}
+}
+
+func TestMarshalerPanic(t *testing.T) {
+	defer func() {
+		if r := recover(); r == nil {
+			t.Errorf("recover = nil, want error")
+		}
+	}()
+	m := &fakeMarshaler{err: errors.New("blah")}
+	MustMarshal(m)
+}
+
+func TestUnmarshaler(t *testing.T) {
+	data := []byte("test data")
+	m := &fakeUnmarshaler{}
+	MustUnmarshal(m, data)
+	if !reflect.DeepEqual(m.data, data) {
+		t.Errorf("data = %s, want %s", m.data, m)
+	}
+}
+
+func TestUnmarshalerPanic(t *testing.T) {
+	defer func() {
+		if r := recover(); r == nil {
+			t.Errorf("recover = nil, want error")
+		}
+	}()
+	m := &fakeUnmarshaler{err: errors.New("blah")}
+	MustUnmarshal(m, nil)
+}
 
 func TestGetBool(t *testing.T) {
 	tests := []struct {
@@ -38,3 +79,22 @@ func TestGetBool(t *testing.T) {
 		}
 	}
 }
+
+type fakeMarshaler struct {
+	data []byte
+	err  error
+}
+
+func (m *fakeMarshaler) Marshal() ([]byte, error) {
+	return m.data, m.err
+}
+
+type fakeUnmarshaler struct {
+	data []byte
+	err  error
+}
+
+func (m *fakeUnmarshaler) Unmarshal(data []byte) error {
+	m.data = data
+	return m.err
+}