diff --git a/String/test/KMPPatternSearching.test.js b/String/test/KMPPatternSearching.test.js
index edc39e7dd..fde89083d 100644
--- a/String/test/KMPPatternSearching.test.js
+++ b/String/test/KMPPatternSearching.test.js
@@ -12,4 +12,16 @@ describe('KMP Matcher', () => {
     const pattern = 'ABCDABD'
     expect(KMPSearch(text, pattern)).toStrictEqual([4, 16])
   })
+
+  it('TC3: expects to return matching indices for pattern in text', () => {
+    const text = 'AAAAA'
+    const pattern = 'AAA'
+    expect(KMPSearch(text, pattern)).toStrictEqual([0, 1, 2])
+  })
+
+  it('TC4: expects to return matching indices for pattern in text', () => {
+    const text = 'ABCD'
+    const pattern = 'BA'
+    expect(KMPSearch(text, pattern)).toStrictEqual([])
+  })
 })