diff --git a/28. Find the Index of the First Occurrence in a String/28.py b/28. Find the Index of the First Occurrence in a String/28.py
new file mode 100644
index 0000000..e7a4831
--- /dev/null
+++ b/28. Find the Index of the First Occurrence in a String/28.py	
@@ -0,0 +1,26 @@
+test_cases = [
+    ["sadbutsad", "sad"],
+    ["leetcode", "leeto"]
+]
+
+expected_results = [
+    0,
+    -1
+]
+
+
+class Solution:
+    def strStr(self, haystack: str, needle: str) -> int:
+        return haystack.find(needle)
+
+
+# Testing
+for i in range(0, len(test_cases)):
+    result = Solution.strStr(
+        Solution, test_cases[i][0], test_cases[i][1])
+    if result == expected_results[i]:
+        print(f"==Test case {i+1} was valid")
+        print(f"✔️  Got '{result}', expected {expected_results[i]}")
+    else:
+        print(f"==Test case {i+1} was INVALID")
+        print(f"❌ Got '{result}', expected {expected_results[i]}")