diff --git a/test_miniuri.py b/test_miniuri.py
index 141e466..2c9b0b6 100644
--- a/test_miniuri.py
+++ b/test_miniuri.py
@@ -17,7 +17,7 @@ class TestMiniUri(TestCase):
     def test_authority(self):
         self.assertEqual(self.u.authority, 'fox:pass@www.foxhop.net:81')
 
-    def test_authority(self):
+    def test_userinfo(self):
         self.assertEqual(self.u.userinfo, 'fox:pass')
 
     def test_username(self):
@@ -47,3 +47,79 @@ class TestMiniUri(TestCase):
     def test_fragment(self):
         self.assertEqual(self.u.fragment, '5')
 
+    # test_change_    
+    # https://fox:pass@www.foxhop.net:81/path/filename.jpg?p=2#5
+    
+    def test_change_uri(self):
+        self.u.uri = 'http://zell:sapp@wwws.foxhop.net:82/my/file.png?p=3#6'
+        self.assertEqual(self.u.uri, 'http://zell:sapp@wwws.foxhop.net:82/my/file.png?p=3#6')
+
+    def test_change_scheme(self):
+        self.u.scheme = 'http'
+        self.assertEqual(self.u.scheme, 'http')
+        self.assertEqual(self.u.uri, 'http://fox:pass@www.foxhop.net:81/path/filename.jpg?p=2#5')
+
+    def test_change_authority(self):
+        self.u.authority = 'zell:ssap@wwws.foxhop.net:82'
+        self.assertEqual(self.u.authority, 'zell:ssap@wwws.foxhop.net:82')
+        self.assertEqual(self.u.uri, 'https://zell:ssap@wwws.foxhop.net:82/path/filename.jpg?p=2#5')
+
+    def test_change_userinfo(self):
+        self.u.userinfo = 'zell:ssap'
+        self.assertEqual(self.u.userinfo, 'zell:ssap')
+        self.assertEqual(self.u.uri, 'https://zell:ssap@www.foxhop.net:81/path/filename.jpg?p=2#5')
+        self.u.userinfo = 'zell'
+        self.assertEqual(self.u.userinfo, 'zell')
+        self.assertEqual(self.u.uri, 'https://zell@www.foxhop.net:81/path/filename.jpg?p=2#5')
+
+    def test_change_username(self):
+        self.u.username = 'zell'
+        self.assertEqual(self.u.username, 'zell')
+        self.assertEqual(self.u.uri, 'https://zell:pass@www.foxhop.net:81/path/filename.jpg?p=2#5')
+    
+    def test_change_password(self):
+        self.u.password = 'ssap'
+        self.assertEqual(self.u.password, 'ssap')
+        self.assertEqual(self.u.uri, 'https://fox:ssap@www.foxhop.net:81/path/filename.jpg?p=2#5')
+
+    def test_change_hostname(self):
+        self.u.hostname = 'wwws.foxhop.net'
+        self.assertEqual(self.u.hostname, 'wwws.foxhop.net')
+        self.assertEqual(self.u.uri, 'https://fox:pass@wwws.foxhop.net:81/path/filename.jpg?p=2#5')
+    
+    def test_change_port(self):
+        self.u.port = '82'
+        self.assertEqual(self.u.port, '82')
+        self.assertEqual(self.u.uri, 'https://fox:pass@www.foxhop.net:82/path/filename.jpg?p=2#5')
+
+    def test_change_path(self):
+        # TODO: filename and extension not updated
+        self.u.path = '/my/file.png'
+        self.assertEqual(self.u.path, '/my/file.png')
+        self.assertEqual(self.u.filename, 'file.png')
+        self.assertEqual(self.u.extension, 'png')
+        self.assertEqual(self.u.uri, 'https://fox:pass@www.foxhop.net:82/my/file.png?p=2#5')
+
+    def test_change_filename(self):
+        self.u.filename = 'file.png'
+        self.assertEqual(self.u.filename, 'file.png')
+        self.assertEqual(self.u.uri, 'https://fox:pass@www.foxhop.net:81/path/file.png?p=2#5')
+
+    def test_change_extension(self):
+        # TODO: attribute error
+        self.u.extension = 'png'
+        self.assertEqual(self.u.extension, 'png')
+        self.assertEqual(self.u.filename, 'filename.png')
+        self.assertEqual(self.u.uri, 'https://fox:pass@www.foxhop.net:81/path/filename.png?p=2#5')
+
+    def test_change_query(self):
+        self.u.query = 'p=3'
+        self.assertEqual(self.u.query, 'p=3')
+        self.assertEqual(self.u.uri, 'https://fox:pass@www.foxhop.net:81/path/filename.jpg?p=3#5')
+
+    def test_change_fragment(self):
+        self.u.fragment = '6'
+        self.assertEqual(self.u.fragment, '6')
+        self.assertEqual(self.u.uri, 'https://fox:pass@www.foxhop.net:81/path/filename.jpg?p=2#6')
+
+