feat(admin): establish core data model

admin/internal/domain/submission_test.go

@@ -0,0 +1,47 @@
+package domain_test
+
+import (
+	"errors"
+	"testing"
+
+	"cmbuyer/admin/internal/domain"
+)
+
+func TestSubmissionTransitions(t *testing.T) {
+	tests := []struct {
+		name    string
+		current domain.SubmissionStatus
+		next    domain.SubmissionStatus
+		allowed bool
+	}{
+		{"submitted", domain.SubmissionStatusFenced, domain.SubmissionStatusSubmitted, true},
+		{"uncertain requires reconciliation", domain.SubmissionStatusFenced, domain.SubmissionStatusReconciliationRequired, true},
+		{"manual review resolves reconciliation", domain.SubmissionStatusReconciliationRequired, domain.SubmissionStatusManualResolved, true},
+		{"cannot reopen fenced submission", domain.SubmissionStatusSubmitted, domain.SubmissionStatusFenced, false},
+		{"submitted cannot require reconciliation", domain.SubmissionStatusSubmitted, domain.SubmissionStatusReconciliationRequired, false},
+		{"cannot skip reconciliation", domain.SubmissionStatusFenced, domain.SubmissionStatusManualResolved, false},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			if got := test.current.CanTransitionTo(test.next); got != test.allowed {
+				t.Fatalf("CanTransitionTo(%s, %s) = %t, want %t", test.current, test.next, got, test.allowed)
+			}
+
+			result, err := domain.TransitionSubmission(test.current, test.next)
+			if test.allowed {
+				if err != nil {
+					t.Fatalf("TransitionSubmission(%s, %s): %v", test.current, test.next, err)
+				}
+				if result != test.next {
+					t.Fatalf("TransitionSubmission(%s, %s) = %s, want %s", test.current, test.next, result, test.next)
+				}
+				return
+			}
+
+			if !errors.Is(err, domain.ErrInvalidSubmissionTransition) {
+				t.Fatalf("TransitionSubmission(%s, %s) error = %v, want ErrInvalidSubmissionTransition", test.current, test.next, err)
+			}
+		})
+	}
+}