Implement notifications service with shared messaging and email drivers (#36)

backend/notifications/bus/dispatch_test.go

@@ -0,0 +1,55 @@
+package bus
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"git.sendico.io/tech/sxchnge/notifications/model"
+	"git.sendico.io/tech/sxchnge/shared/database/record"
+	merrors "git.sendico.io/tech/sxchnge/shared/errors"
+	"git.sendico.io/tech/sxchnge/shared/messaging/reliable"
+	"go.mongodb.org/mongo-driver/v2/bson"
+)
+
+type outbox struct{ jobs []model.Notification }
+
+func (o *outbox) Due(context.Context, time.Time) ([]model.Notification, error) { return o.jobs, nil }
+func (o *outbox) Recover(context.Context, time.Time) error                     { return nil }
+
+type publisher struct {
+	reliable.Transport
+	fail    bool
+	records []reliable.Record
+}
+
+func (p *publisher) Publish(_ context.Context, r reliable.Record) error {
+	if p.fail {
+		return merrors.ServiceUnavailable("offline")
+	}
+	p.records = append(p.records, r)
+	return nil
+}
+func TestOutboxSurvivesPublishFailure(t *testing.T) {
+	id := bson.NewObjectID()
+	out := &outbox{jobs: []model.Notification{{Base: storable.Base{ID: id}, Email: model.Email{Address: "private@example.com", Text: "private"}}}}
+	transport := &publisher{fail: true}
+	b := &Bus{outbox: out, transport: transport}
+	if err := b.PublishDue(context.Background()); err == nil {
+		t.Fatal("publication failure hidden")
+	}
+	transport.fail = false
+	if err := b.PublishDue(context.Background()); err != nil {
+		t.Fatal(err)
+	}
+	if len(transport.records) != 1 || string(transport.records[0].Payload) != id.Hex() || transport.records[0].MessageID != id.Hex()+"-0" {
+		t.Fatal(transport.records)
+	}
+	out.jobs[0].Attempts = 1
+	if err := b.PublishDue(context.Background()); err != nil {
+		t.Fatal(err)
+	}
+	if transport.records[1].MessageID == transport.records[0].MessageID {
+		t.Fatal("retry shares transport deduplication identity")
+	}
+}