fix bug

hutool-core/src/test/java/cn/hutool/core/util/ArrayUtilTest.java

@@ -1,11 +1,14 @@
 package cn.hutool.core.util;
 
+import cn.hutool.core.collection.CollUtil;
 import cn.hutool.core.lang.Editor;
 import cn.hutool.core.lang.Filter;
 import org.junit.Assert;
 import org.junit.Test;
 
+import java.util.ArrayList;
 import java.util.Map;
+import java.util.Objects;
 
 /**
  * {@link ArrayUtil} 数组工具单元测试
@@ -20,8 +23,10 @@ public class ArrayUtilTest {
 		Assert.assertTrue(ArrayUtil.isEmpty(a));
 		Assert.assertTrue(ArrayUtil.isEmpty((Object) a));
 		int[] b = null;
+		//noinspection ConstantConditions
 		Assert.assertTrue(ArrayUtil.isEmpty(b));
 		Object c = null;
+		//noinspection ConstantConditions
 		Assert.assertTrue(ArrayUtil.isEmpty(c));
 
 		Object d = new Object[]{"1", "2", 3, 4D};
@@ -31,7 +36,9 @@ public class ArrayUtilTest {
 		isEmpty = ArrayUtil.isEmpty(d);
 		Assert.assertTrue(isEmpty);
 		d = null;
+		//noinspection ConstantConditions
 		isEmpty = ArrayUtil.isEmpty(d);
+		//noinspection ConstantConditions
 		Assert.assertTrue(isEmpty);
 	}
 
@@ -117,7 +124,7 @@ public class ArrayUtilTest {
 		String[] keys = {"a", "b", "c"};
 		Integer[] values = {1, 2, 3};
 		Map<String, Integer> map = ArrayUtil.zip(keys, values, true);
-		Assert.assertEquals(map.toString(), "{a=1, b=2, c=3}");
+		Assert.assertEquals(Objects.requireNonNull(map).toString(), "{a=1, b=2, c=3}");
 	}
 
 	@Test
@@ -248,4 +255,14 @@ public class ArrayUtilTest {
 		String[] array = {"aa", "bb", "cc", "dd", "bb", "dd"};
 		Assert.assertEquals("[aa, bb, cc, dd, bb, dd]", ArrayUtil.toString(array));
 	}
+
+	@Test
+	public void toArrayTest(){
+		final ArrayList<String> list = CollUtil.newArrayList("A", "B", "C", "D");
+		final String[] array = ArrayUtil.toArray(list, String.class);
+		Assert.assertEquals("A", array[0]);
+		Assert.assertEquals("B", array[1]);
+		Assert.assertEquals("C", array[2]);
+		Assert.assertEquals("D", array[3]);
+	}
 }