增加uitest xts用例.Signed-off-by: <zhouke35@huawei.com>.

Signed-off-by: Nzhouke <zhouke35@huawei.com>

arkXtest/uitest/src/main/ets/test/uitest.test.ets

@@ -1161,5 +1161,31 @@ export default function UiTest() {
       expect(text == null).assertTrue()
       await stopApplication('com.uitestScene.acts')
     })
+
+    /*
+     * @tc.number: uiTest_5800
+     * @tc.name: testSplit 
+     * @tc.desc: change this UiWindow into split screen mode.
+     */
+    it('testSplit', 0, async function () {
+      await startAbility('com.uitestScene.acts', 'com.uitestScene.acts.MainAbility')
+      let driver = UiDriver.create()
+      await driver.delayMs(waitUiReadyMs)
+      let window1 = await driver.findWindow({bundleName:'com.uitestScene.acts'})
+      try {
+        await window1.split()
+        await driver.delayMs(waitUiReadyMs)
+        let window2 = await driver.findWindow({bundleName:'com.ohos.systemui'})
+        expect(window2 == null).assertTrue()
+      }
+      catch (err) {
+        if (err.message == 'this device can not support this action') {
+          expect(window1 != null).assertTrue()
+        } else {
+          expect(false).assertTrue()
+        }
+      }
+      await stopApplication('com.uitestScene.acts')
+    })
   })
 }
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