From a9e65cd865cedf76557df237bfdb134533aece08 Mon Sep 17 00:00:00 2001
From: Kasun Thennakoon <tmkasun@gmail.com>
Date: Tue, 2 Aug 2022 18:53:41 +0530
Subject: [PATCH] Wrapping the example matrix with outer array (#1057)

---
 Graphs/NumberOfIslands.js           |  7 -------
 Graphs/test/NumberOfIslands.test.js | 31 +++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 7 deletions(-)
 create mode 100644 Graphs/test/NumberOfIslands.test.js

diff --git a/Graphs/NumberOfIslands.js b/Graphs/NumberOfIslands.js
index 84b666d37..62891a481 100644
--- a/Graphs/NumberOfIslands.js
+++ b/Graphs/NumberOfIslands.js
@@ -79,10 +79,3 @@ const islands = (matrixGrid) => {
 }
 
 export { islands }
-
-// islands(
-//   ['1', '1', '0', '0', '0'],
-//   ['1', '1', '0', '0', '0'],
-//   ['0', '0', '1', '0', '0'],
-//   ['0', '0', '0', '1', '1']
-// )
diff --git a/Graphs/test/NumberOfIslands.test.js b/Graphs/test/NumberOfIslands.test.js
new file mode 100644
index 000000000..3beb1da75
--- /dev/null
+++ b/Graphs/test/NumberOfIslands.test.js
@@ -0,0 +1,31 @@
+import { islands } from '../NumberOfIslands'
+
+describe('Number of Islands', () => {
+  test('Graph with three islands', () => {
+    const graph = [
+      ['1', '1', '0', '0', '0'],
+      ['1', '1', '0', '0', '0'],
+      ['0', '0', '1', '0', '0'],
+      ['0', '0', '0', '1', '1']
+    ]
+    expect(islands(graph)).toBe(3)
+  })
+
+  test('Graph with only one island', () => {
+    const graph = [
+      ['1', '1'],
+      ['1', '1'],
+      ['0', '0'],
+      ['0', '0']
+    ]
+    expect(islands(graph)).toBe(1)
+  })
+
+  test('No islands', () => {
+    const graph = [
+      ['0', '0'],
+      ['0', '0']
+    ]
+    expect(islands(graph)).toBe(0)
+  })
+})