diff --git a/tests/test_rtutil.py b/tests/test_rtutil.py
index 9aed048bbc91874b0513f51f1964958c78f38a5f..042634c270bd5cff11c698b22ebd94a018bb4967 100644
--- a/tests/test_rtutil.py
+++ b/tests/test_rtutil.py
@@ -43,7 +43,7 @@ def rt():
 @pytest.fixture
 def new_client():
     class RTClient(testutil.RTClient):
-        TICKET_DATA = {'1': [], '2': []}
+        TICKET_DATA = testutil.RTClient.TICKET_DATA.copy()
     return RTClient()
 
 @pytest.mark.parametrize('ticket_id,attachment_id,expected', EXPECTED_URLS)
@@ -53,20 +53,19 @@ def test_url(rt, ticket_id, attachment_id, expected):
     assert rt.url(ticket_id, attachment_id) == expected
 
 @pytest.mark.parametrize('attachment_id', [
-    3,
+    13,
     None,
 ])
 def test_url_caches(new_client, attachment_id):
-    new_client.TICKET_DATA['1'].append(('3', '(Unnamed)', 'text/plain', '3.0k'))
     if attachment_id is None:
         fragment = ''
     else:
-        fragment = '#txn-3'
-    expected = '{}Ticket/Display.html?id=1{}'.format(DEFAULT_RT_URL, fragment)
+        fragment = '#txn-11'
+    expected = '{}Ticket/Display.html?id=2{}'.format(DEFAULT_RT_URL, fragment)
     rt = rtutil.RT(new_client)
-    assert rt.url(1, attachment_id) == expected
+    assert rt.url(2, attachment_id) == expected
     new_client.TICKET_DATA.clear()
-    assert rt.url(1, attachment_id) == expected
+    assert rt.url(2, attachment_id) == expected
 
 @pytest.mark.parametrize('mimetype,extension', [
     ('application/pdf', 'pdf'),
@@ -75,7 +74,7 @@ def test_url_caches(new_client, attachment_id):
     ('x-test/x-unknown', 'bin'),
 ])
 def test_url_default_filename(new_client, mimetype, extension):
-    new_client.TICKET_DATA['1'].append(('9', '(Unnamed)', mimetype, '50.5k'))
+    new_client.TICKET_DATA['1'] = [('9', '(Unnamed)', mimetype, '50.5k')]
     rt = rtutil.RT(new_client)
     expected = '{}Ticket/Attachment/9/9/RT1%20attachment%209.{}'.format(DEFAULT_RT_URL, extension)
     assert rt.url(1, 9) == expected
@@ -86,16 +85,15 @@ def test_exists(rt, ticket_id, attachment_id, expected):
     assert rt.exists(ticket_id, attachment_id) is expected
 
 def test_exists_caches(new_client):
-    new_client.TICKET_DATA['1'].append(('3', '(Unnamed)', 'text/plain', '3.0k'))
     rt = rtutil.RT(new_client)
     assert rt.exists(1, 3)
     assert rt.exists(2)
-    assert not rt.exists(1, 9)
+    assert not rt.exists(1, 99)
     assert not rt.exists(9)
     new_client.TICKET_DATA.clear()
     assert rt.exists(1, 3)
     assert rt.exists(2)
-    assert not rt.exists(1, 9)
+    assert not rt.exists(1, 99)
     assert not rt.exists(9)
 
 @pytest.mark.parametrize('link,expected', [