diff --git a/tests/0.Lecture 11/test_mystery.py b/tests/0.Lecture 11/test_mystery.py
new file mode 100644
index 0000000000000000000000000000000000000000..f8e93a7814c73946ff038448b50974f2841c68dc
--- /dev/null
+++ b/tests/0.Lecture 11/test_mystery.py	
@@ -0,0 +1,168 @@
+import importlib
+import sys
+import pytest
+
+naming = importlib.import_module('tests.helpers.naming', 'lecture-code')
+apply_names = naming.apply_names
+
+
+def fun_tester(f, vals):
+    if '11.secret' in sys.modules:
+        del sys.modules['11.secret']
+    ref = importlib.import_module('11.secret', 'lecture-code')
+    if '11.code' in sys.modules:
+        del sys.modules['11.code']
+    code = importlib.import_module('11.code', 'lecture-code')
+    reference_values = ['in=' + str(x) + ', out=' +
+                        str(getattr(ref, f)(x)) for x in vals]
+    student_values = ['in=' + str(x) + ', out=' +
+                      str(getattr(code, f)(x)) for x in vals]
+    assert reference_values == student_values
+
+
+def test_f():
+    fun_tester('f', range(0, 100))
+
+
+def test_g():
+    fun_tester('g', range(0, 200))
+
+
+VEGETABLES = [
+    "acorn squash",
+    "alfalfa sprout",
+    "amaranth",
+    "anise",
+    "artichoke",
+    "arugula",
+    "asparagus",
+    "aubergine",
+    "azuki bean",
+    "banana squash",
+    "basil",
+    "bean sprout",
+    "beet",
+    "black bean",
+    "black-eyed pea",
+    "bok choy",
+    "borlotti bean",
+    "broad beans",
+    "broccoflower",
+    "broccoli",
+    "brussels sprout",
+    "butternut squash",
+    "cabbage",
+    "calabrese",
+    "caraway",
+    "carrot",
+    "cauliflower",
+    "cayenne pepper",
+    "celeriac",
+    "celery",
+    "chamomile",
+    "chard",
+    "chayote",
+    "chickpea",
+    "chives",
+    "cilantro",
+    "collard green",
+    "corn",
+    "corn salad",
+    "courgette",
+    "cucumber",
+    "daikon",
+    "delicata",
+    "dill",
+    "eggplant",
+    "endive",
+    "fennel",
+    "fiddlehead",
+    "frisee",
+    "garlic",
+    "gem squash",
+    "ginger",
+    "green bean",
+    "green pepper",
+    "habanero",
+    "herbs and spice",
+    "horseradish",
+    "hubbard squash",
+    "jalapeno",
+    "jerusalem artichoke",
+    "jicama",
+    "kale",
+    "kidney bean",
+    "kohlrabi",
+    "lavender",
+    "leek ",
+    "legume",
+    "lemon grass",
+    "lentils",
+    "lettuce",
+    "lima bean",
+    "mamey",
+    "mangetout",
+    "marjoram",
+    "mung bean",
+    "mushroom",
+    "mustard green",
+    "navy bean",
+    "new zealand spinach",
+    "nopale",
+    "okra",
+    "onion",
+    "oregano",
+    "paprika",
+    "parsley",
+    "parsnip",
+    "patty pan",
+    "pea",
+    "pinto bean",
+    "potato",
+    "pumpkin",
+    "radicchio",
+    "radish",
+    "rhubarb",
+    "rosemary",
+    "runner bean",
+    "rutabaga",
+    "sage",
+    "scallion",
+    "shallot",
+    "skirret",
+    "snap pea",
+    "soy bean",
+    "spaghetti squash",
+    "spinach",
+    "squash",
+    "sweet potato",
+    "tabasco pepper",
+    "taro",
+    "tat soi",
+    "thyme",
+    "topinambur",
+    "tubers",
+    "turnip",
+    "wasabi",
+    "water chestnut",
+    "watercress",
+    "white radish",
+    "yam",
+    "zucchini"
+]
+
+
+def test_h():
+    fun_tester('h', VEGETABLES)
+
+
+def test_i():
+    fun_tester('i', VEGETABLES)
+
+
+def test_j():
+    fun_tester('j', VEGETABLES)
+
+
+def test_k():
+    fun_tester('k', [(x, y) for x in VEGETABLES[:15] for y in VEGETABLES[15:]])