优化结构

internal/integration/payment/adapter_test.go

@@ -18,3 +18,40 @@ func TestEverySupportedProviderHasAdapter(t *testing.T) {
 		})
 	}
 }
+
+func TestNewNormalizesProviderIdentifier(t *testing.T) {
+	for _, provider := range bizpayment.SupportedPaymentProviders {
+		adapter, err := New("  " + provider + "  ")
+		if err != nil {
+			t.Fatalf("New(%q): %v", provider, err)
+		}
+		if adapter == nil {
+			t.Fatalf("New(%q) returned nil", provider)
+		}
+	}
+}
+
+func TestNewRejectsUnknownProvider(t *testing.T) {
+	if _, err := New("unknown-provider"); err == nil {
+		t.Fatal("unknown provider unexpectedly accepted")
+	}
+}
+
+func TestNonceIsUniqueForConcurrentRequests(t *testing.T) {
+	const count = 1000
+	values := make(chan string, count)
+	for i := 0; i < count; i++ {
+		go func() { values <- nonce() }()
+	}
+	seen := make(map[string]struct{}, count)
+	for i := 0; i < count; i++ {
+		value := <-values
+		if value == "" {
+			t.Fatal("nonce returned an empty value")
+		}
+		if _, exists := seen[value]; exists {
+			t.Fatalf("nonce collision for %q", value)
+		}
+		seen[value] = struct{}{}
+	}
+}