diff --git a/Sorts/PigeonHoleSort.js b/Sorts/PigeonHoleSort.js
index 333027c68c..30c1bcb813 100644
--- a/Sorts/PigeonHoleSort.js
+++ b/Sorts/PigeonHoleSort.js
@@ -29,4 +29,5 @@ export function pigeonHoleSort (arr) {
arr[index++] = j + min
}
}
+ return arr
}
diff --git a/Sorts/test/pigeonHoleSort.test.js b/Sorts/test/pigeonHoleSort.test.js
new file mode 100644
index 0000000000..6816051c3b
--- /dev/null
+++ b/Sorts/test/pigeonHoleSort.test.js
@@ -0,0 +1,19 @@
+import { pigeonHoleSort } from '../PigeonHoleSort'
+
+test('The pigeonHoleSort of the array [1, 4, 3, 2] is [1, 2, 3, 4]', () => {
+ const arr = [1, 4, 3, 2]
+ const res = pigeonHoleSort(arr)
+ expect(res).toEqual([1, 2, 3, 4])
+})
+
+test('The pigeonHoleSort of the array [5, 4, 1, 2] is [1, 2, 4, 5]', () => {
+ const arr = [5, 4, 1, 2]
+ const res = pigeonHoleSort(arr)
+ expect(res).toEqual([1, 2, 4, 5])
+})
+
+test('The pigeonHoleSort of the array [18, 31, 29, 35, 11] is [11, 18, 29, 31, 35]', () => {
+ const arr = [18, 31, 29, 35, 11]
+ const res = pigeonHoleSort(arr)
+ expect(res).toEqual([11, 18, 29, 31, 35])
+})
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