test explicit orchestration contracts

internal/provider/contract_test.go

@@ -0,0 +1,33 @@
+package provider
+
+import (
+	"errors"
+	"testing"
+
+	"orchestra/internal/domain"
+)
+
+type appendThenReflectSink struct{ appended bool }
+
+func (s *appendThenReflectSink) Append(domain.Event) error { s.appended = true; return nil }
+
+type failingReflector struct{}
+
+func (failingReflector) ReflectTask(domain.Task, domain.Event) error {
+	return errors.New("provider unavailable")
+}
+
+type taskLookup struct{}
+
+func (taskLookup) Task(string) (domain.Task, bool) { return domain.Task{ID: "task"}, true }
+
+func TestReflectingSinkAppendsBeforeReflection(t *testing.T) {
+	sink := &appendThenReflectSink{}
+	err := (ReflectingSink{Sink: sink, Tasks: taskLookup{}, Reflector: failingReflector{}}).Append(domain.Event{TaskID: "task", Type: "TaskCompleted"})
+	if !sink.appended {
+		t.Fatal("reflection was attempted before canonical append")
+	}
+	if err == nil {
+		t.Fatal("reflection failure was hidden")
+	}
+}