添加 CollectionTools 单元测试

ProgressOfTesting.txt

@@ -26,7 +26,7 @@ xyz.zhouxy.plusone.commons
     │
     ├───collection
     │       AbstractMapWrapper.java               [ ]
-    │       CollectionTools.java                  [ ]
+    │       CollectionTools.java                  [Y]
     │       MapWrapper.java                       [ ]
     │       ReadWriteLockedTable.java             [ ]
     │       SafeConcurrentHashMap.java            [ ]

src/test/java/xyz/zhouxy/plusone/commons/collection/CollectionToolsTests.java

@@ -0,0 +1,33 @@
+package xyz.zhouxy.plusone.commons.collection;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+
+public class CollectionToolsTests {
+    @Test
+    void testIsEmpty() {
+
+        List<String> list = new ArrayList<>();
+        assertTrue(CollectionTools.isEmpty(list));
+        assertFalse(CollectionTools.isNotEmpty(list));
+
+        list.add("Test");
+        assertFalse(CollectionTools.isEmpty(list));
+        assertTrue(CollectionTools.isNotEmpty(list));
+
+        Map<String, Integer> map = new HashMap<>();
+        assertTrue(CollectionTools.isEmpty(map));
+        assertFalse(CollectionTools.isNotEmpty(map));
+
+        map.put("2", 2);
+        assertFalse(CollectionTools.isEmpty(map));
+        assertTrue(CollectionTools.isNotEmpty(map));
+    }
+}