add test

hutool-core/src/test/java/cn/hutool/core/collection/partition/PartitionTest.java

@@ -0,0 +1,56 @@
+package cn.hutool.core.collection.partition;
+
+import cn.hutool.core.collection.ListUtil;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class PartitionTest {
+	@Test
+	public void sizeTest() {
+		final ArrayList<Integer> list = ListUtil.of(1, 2, 3, 4, 5);
+		final Partition<Integer> partition = new Partition<>(list, 4);
+		Assert.assertEquals(2, partition.size());
+	}
+
+	@Test
+	public void getSizeTest() {
+		List<Integer> mockedList = makingList(19);
+		Partition<Integer> partition = new Partition<>(mockedList, 10);
+		Assert.assertEquals(2, partition.size());
+
+		mockedList = makingList(11);
+		partition = new Partition<>(mockedList, 10);
+		Assert.assertEquals(2, partition.size());
+
+		mockedList = makingList(10);
+		partition = new Partition<>(mockedList, 10);
+		Assert.assertEquals(1, partition.size());
+
+		mockedList = makingList(9);
+		partition = new Partition<>(mockedList, 10);
+		Assert.assertEquals(1, partition.size());
+
+		mockedList = makingList(5);
+		partition = new Partition<>(mockedList, 10);
+		Assert.assertEquals(1, partition.size());
+	}
+
+	@Test
+	public void getZeroSizeTest() {
+		final List<Integer> mockedList = makingList(0);
+		final Partition<Integer> partition = new Partition<>(mockedList, 10);
+		Assert.assertEquals(0, partition.size());
+	}
+
+	private List<Integer> makingList(final int length) {
+		final List<Integer> list = ListUtil.of();
+		for (int i = 0; i < length; i++) {
+			list.add(i);
+		}
+
+		return list;
+	}
+}