diff --git a/test/com/leetcode/arrays/RotateArrayTest.java b/test/com/leetcode/arrays/RotateArrayTest.java
new file mode 100644
index 00000000..ba686fdb
--- /dev/null
+++ b/test/com/leetcode/arrays/RotateArrayTest.java
@@ -0,0 +1,34 @@
+package com.leetcode.arrays;
+import org.junit.Test;
+import static org.junit.Assert.assertArrayEquals;
+
+public class RotateArrayTest {
+
+ @Test
+ public void testRotateArray_whenRotateThreeStep() {
+ // Given
+ RotateArray rotateArray = new RotateArray();
+ int[] arr = {1, 2, 3, 4, 5, 6, 7};
+ int[] exepctedArr = {5, 6, 7, 1, 2, 3, 4};
+
+ // When
+ rotateArray.rotate(arr, 3);
+
+ // Then
+ assertArrayEquals(arr, exepctedArr);
+ }
+
+ @Test
+ public void testRotateArray_whenRotateFourStepAndArrayHasOnlyOneElement() {
+ // Given
+ RotateArray rotateArray = new RotateArray();
+ int[] arr = {1};
+ int[] exepctedArr = {1};
+
+ // When
+ rotateArray.rotate(arr, 4);
+
+ // Then
+ assertArrayEquals(arr, exepctedArr);
+ }
+}
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