diff --git a/test/test_buffer.py b/test/test_buffer.py
index 18d1b42..499dfd9 100644
--- a/test/test_buffer.py
+++ b/test/test_buffer.py
@@ -132,3 +132,14 @@ class TestBuffer:
             assert mpint2w(p[0]) == self._b(p[1])
             assert mpint2r(self._b(p[1])) == p[0]
         assert mpint2r(self._b('00 00 00 02 ff 80')) == -0x80
+
+    def test_reset(self):
+        w = self.wbuf()
+        w.write_int(7)
+        w.write_int(13)
+        assert len(w.write_flush()) == 8
+
+        w.write_int(7)
+        w.write_int(13)
+        w.reset()
+        assert len(w.write_flush()) == 0
diff --git a/test/test_utils.py b/test/test_utils.py
index d053d05..d5251f7 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -67,3 +67,10 @@ class TestUtils:
         assert self.utils.unique_seq((3, 3, 3, 2, 2, 1)) == (3, 2, 1)
         assert self.utils.unique_seq([1, 2, 2, 3, 3, 3]) == [1, 2, 3]
         assert self.utils.unique_seq([3, 3, 3, 2, 2, 1]) == [3, 2, 1]
+
+    def test_parse_float(self):
+        assert self.utils.parse_float('5.x') == -1.0
+
+    def test_ipv6address(self):
+        assert self.utils.is_ipv6_address('1.2.3.4') is False
+        assert self.utils.is_ipv6_address('2600:1f18:420a:b500:bc4:c9c6:1d6:e3e4') is True