diff --git a/test/test_fast_parser.py b/test/test_fast_parser.py
new file mode 100644
index 00000000..9de0100d
--- /dev/null
+++ b/test/test_fast_parser.py
@@ -0,0 +1,22 @@
+import jedi
+
+def test_add_to_end():
+    """
+    fast_parser doesn't parse everything again. It just updates with the
+    help of caches, this is an example that didn't work.
+    """
+
+    a = """
+class Abc():
+    def abc(self):
+        self.x = 3
+
+class Two(Abc):
+    def h(self):
+        self.
+"""  #       ^ here is the first completion
+
+    b = "    def h(self):\n" \
+        "        self."
+    assert jedi.Script(a, 8, 13, 'example.py').completions()
+    assert  jedi.Script(a + b, path='example.py').completions()