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lastleg-service/src/test/java/com/baiyue/lastleg/discard/CargoDiscardSchemaContractTest.java

@@ -3,10 +3,51 @@ package com.baiyue.lastleg.discard;
 import org.junit.jupiter.api.Test;
 
 import java.nio.charset.StandardCharsets;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import com.baiyue.lastleg.returnreceipt.mapper.ReturnInventoryCartonItemMapper;
+import org.apache.ibatis.annotations.Update;
 
 import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
 class CargoDiscardSchemaContractTest {
+    @Test
+    void returnCartonDeductionAllowsZeroButRejectsNegativeStock() throws Exception {
+        String baseline;
+        try (var input = getClass().getResourceAsStream("/db/lastleg.sql")) {
+            baseline = new String(input.readAllBytes(), StandardCharsets.UTF_8);
+        }
+        var constraint = java.util.regex.Pattern.compile(
+            "CONSTRAINT chk_ll_return_inventory_carton_item_quantity CHECK\\(([^)]+)\\)")
+            .matcher(baseline);
+        assertTrue(constraint.find());
+        String deduction = ReturnInventoryCartonItemMapper.class.getMethod("deduct", long.class, long.class)
+            .getAnnotation(Update.class).value()[0]
+            .replace("#{quantity}", "?").replace("#{id}", "?");
+        try (var connection = DriverManager.getConnection("jdbc:h2:mem:discard_zero_quantity;MODE=MySQL")) {
+            try (var statement = connection.createStatement()) {
+                statement.execute("CREATE TABLE ll_return_inventory_carton_item (id BIGINT PRIMARY KEY, "
+                    + "quantity BIGINT NOT NULL, CONSTRAINT chk_ll_return_inventory_carton_item_quantity CHECK("
+                    + constraint.group(1) + "))");
+                statement.execute("INSERT INTO ll_return_inventory_carton_item VALUES (1, 3)");
+                try (var update = connection.prepareStatement(deduction)) {
+                    update.setLong(1, 3); update.setLong(2, 1); update.setLong(3, 3);
+                    assertEquals(1, update.executeUpdate());
+                    update.setLong(1, 1); update.setLong(3, 1);
+                    assertEquals(0, update.executeUpdate());
+                }
+                try (var result = statement.executeQuery("SELECT quantity FROM ll_return_inventory_carton_item WHERE id=1")) {
+                    assertTrue(result.next());
+                    assertEquals(0, result.getLong(1));
+                }
+                assertThrows(SQLException.class, () -> statement.executeUpdate(
+                    "UPDATE ll_return_inventory_carton_item SET quantity=-1 WHERE id=1"));
+            }
+        }
+    }
+
     @Test
     void baselineContainsDiscardApplicationReservationAndHistoryTables() throws Exception {
         String sql;