chore[litemall-db]: 一个测试mapper返回值的测试用例。

通常mapper的crud的int返回值是数据库所影响的数据的条目数量。

litemall-db/src/test/java/org/linlinjava/litemall/db/MapperReturnTest.java

+package org.linlinjava.litemall.db;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.linlinjava.litemall.db.dao.LitemallSystemMapper;
+import org.linlinjava.litemall.db.domain.LitemallSystem;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.test.context.web.WebAppConfiguration;
+
+@WebAppConfiguration
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringBootTest
+public class MapperReturnTest {
+
+    @Autowired
+    private LitemallSystemMapper systemMapper;
+
+    @Test
+    public void test() {
+        LitemallSystem system = new LitemallSystem();
+        system.setKeyName("test-system-key");
+        system.setKeyValue("test-system-value");
+        int updates = systemMapper.insertSelective(system);
+        Assert.assertEquals(updates, 1);
+
+        updates = systemMapper.deleteByPrimaryKey(system.getId());
+        Assert.assertEquals(updates, 1);
+
+        updates = systemMapper.updateByPrimaryKey(system);
+        Assert.assertEquals(updates, 0);
+    }
+
+}
+