Challenge 308 LK Perl Python

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+#!/usr/bin/env python3
+"""
+Task 1: Count Common
+
+Given two arrays of strings, str1 and str2,
+return the count of common strings in both arrays.
+
+Examples:
+  Input: str1 = ["perl", "weekly", "challenge"]
+         str2 = ["raku", "weekly", "challenge"]
+  Output: 2
+
+  Input: str1 = ["perl", "raku", "python"]
+         str2 = ["python", "java"]
+  Output: 1
+
+  Input: str1 = ["guest", "contribution"]
+         str2 = ["fun", "weekly", "challenge"]
+  Output: 0
+
+"""
+
+import unittest
+
+# typedef: Define a type alias for list of strings.
+StrList = list[str]
+
+
+def count_common(str1: StrList, str2: StrList) -> int:
+    """
+    Count the number of common strings between two lists.
+    """
+    return len(set(str1).intersection(str2))
+
+
+class TestCountCommon(unittest.TestCase):
+
+    def test_example1(self):
+        self.assertEqual(
+            count_common(["perl", "weekly", "challenge"],
+                         ["raku", "weekly", "challenge"]), 2)
+
+    def test_example2(self):
+        self.assertEqual(
+            count_common(["perl", "raku", "python"], ["python", "java"]), 1)
+
+    def test_example3(self):
+        self.assertEqual(
+            count_common(["guest", "contribution"],
+                         ["fun", "weekly", "challenge"]), 0)
+
+
+if __name__ == '__main__':
+    unittest.main()