feat(t208): close candidate decision feedback loop

backend-api/internal/usecase/execution_result_service_test.go

@@ -26,9 +26,12 @@ func TestValidateCandidateCommandAcceptsMatchedColorAndSize(t *testing.T) {
 func TestValidateCandidateCommandRejectsUnknownHardConstraint(t *testing.T) {
 	command := validAIExecutionCandidateCommand()
 	command.Candidates[0].Evaluation.HardConstraints[1].Status = "UNKNOWN"
+	command.Candidates[0].Evaluation.Decision = "REJECT"
+	command.Candidates[0].Evaluation.RejectionReasons = []string{"尺码无法确认"}
+	command.Recommendation = nil
 
-	if err := validateCandidateCommand(command); err == nil {
-		t.Fatal("expected unknown hard constraint to be rejected")
+	if err := validateCandidateCommand(command); err != nil {
+		t.Fatalf("validate observed unknown hard constraint: %v", err)
 	}
 }
 
@@ -50,7 +53,7 @@ func TestValidateCandidateCommandRejectsWeakV2Candidate(t *testing.T) {
 	}
 }
 
-func TestValidateCandidateCommandRejectsV2RecommendationAfterFirstCandidate(t *testing.T) {
+func TestValidateCandidateCommandAcceptsV2RecommendationUsingOriginalOrdinal(t *testing.T) {
 	command := validAIExecutionCandidateCommand()
 	second := command.Candidates[0]
 	second.Ordinal = 2
@@ -58,8 +61,27 @@ func TestValidateCandidateCommandRejectsV2RecommendationAfterFirstCandidate(t *t
 	command.Candidates = append(command.Candidates, second)
 	command.Recommendation.CandidateOrdinal = 2
 
+	if err := validateCandidateCommand(command); err != nil {
+		t.Fatalf("validate recommendation using original ordinal: %v", err)
+	}
+}
+
+func TestValidateCandidateCommandRejectsV2RecommendationForRejectedCandidate(t *testing.T) {
+	command := validAIExecutionCandidateCommand()
+	second := command.Candidates[0]
+	second.Ordinal = 2
+	second.Title = "拼多多图片候选 2"
+	second.Evaluation = &CandidateEvaluation{
+		Decision:         "REJECT",
+		Score:            0.2,
+		Confidence:       0.9,
+		RejectionReasons: []string{"颜色不匹配"},
+	}
+	command.Candidates = append(command.Candidates, second)
+	command.Recommendation.CandidateOrdinal = 2
+
 	if err := validateCandidateCommand(command); err == nil {
-		t.Fatal("expected v2 recommendation after first candidate to be rejected")
+		t.Fatal("expected recommendation for rejected candidate to be rejected")
 	}
 }