add test for duplicated notify calls

context_test.go

@@ -3,6 +3,7 @@ package spcontext_test
 import (
 	"bytes"
 	"context"
+	"github.com/stretchr/testify/assert"
 	"testing"
 
 	"github.com/bugsnag/bugsnag-go/v2"
@@ -309,3 +310,23 @@ func TestBackgroundWithValuesFrom(t *testing.T) {
 	require.Equal(t, "keyValue", backgroundWithValues.Value("keyName"))
 	require.Equal(t, "fieldValue", backgroundWithValues.Fields().Value("fieldName"))
 }
+
+func TestNotifiedLogic(t *testing.T) {
+	base := spcontext.New(log.NewNopLogger())
+	notifier := new(testutils.MockNotifier)
+	notifier.On(
+		"Notify",
+		mock.MatchedBy(func(in interface{}) bool {
+			err, ok := in.(error)
+			require.True(t, ok)
+			assert.EqualError(t, err, "initial error")
+			return true
+		}),
+		mock.Anything,
+	).Times(1).Return(nil)
+	defer notifier.AssertExpectations(t)
+	base.Notifier = notifier
+	err := base.InternalError(errors.New("initial error"), "foo")
+	err = base.DirectError(err, "skipped error")
+	err = base.DirectError(err, "also skipped error")
+}