feat: add unit and integration tests for mDNS.

tests/discovery/mdns/test_utils.py

@@ -0,0 +1,39 @@
+"""
+Basic unit tests for mDNS utils module.
+"""
+import string
+import pytest
+
+from libp2p.discovery.mdns.utils import stringGen
+
+
+class TestStringGen:
+    """Basic unit tests for stringGen function."""
+
+    def test_stringgen_default_length(self):
+        """Test stringGen with default length (63)."""
+        result = stringGen()
+        
+        assert isinstance(result, str)
+        assert len(result) == 63
+        
+        # Check that all characters are from the expected charset
+        charset = string.ascii_lowercase + string.digits
+        for char in result:
+            assert char in charset
+
+    def test_stringgen_custom_length(self):
+        """Test stringGen with custom lengths."""
+        # Test various lengths
+        test_lengths = [1, 5, 10, 20, 50, 100]
+        
+        for length in test_lengths:
+            result = stringGen(length)
+            
+            assert isinstance(result, str)
+            assert len(result) == length
+            
+            # Check that all characters are from the expected charset
+            charset = string.ascii_lowercase + string.digits
+            for char in result:
+                assert char in charset