test(firstleg): cover printable pallet without nickname

firstleg/src/test/java/com/baiyue/firstleg/service/IamCustomerSnapshotServiceTest.java

@@ -66,4 +66,12 @@ class IamCustomerSnapshotServiceTest {
 
         assertThat(service.customerNickname(7L)).isEqualTo("Short Name");
     }
+
+    @Test
+    void usesPlaceholderForPrintWhenCustomerNicknameIsMissing() {
+        when(client.page("internal-token", 1, 2, null, null, 7L))
+            .thenReturn(ApiResponse.success(new PageResult<>(List.of(), 1, 2, 0, 0)));
+
+        assertThat(service.customerNicknameForPrint(7L)).isEqualTo("—");
+    }
 }

firstleg/src/test/java/com/baiyue/firstleg/service/InboundCartonLabelPrintServiceTest.java

@@ -320,6 +320,6 @@ class InboundCartonLabelPrintServiceTest {
         sku.setMaxUnitsPerCarton(19);
         when(palletization.printSkuRows(palletId))
             .thenReturn(palletId == 90001L ? List.of(sku) : List.of());
-        when(customerSnapshots.customerNickname(10001L)).thenReturn("小虫科技");
+        when(customerSnapshots.customerNicknameForPrint(10001L)).thenReturn("小虫科技");
     }
 }