diff --git a/tests/test_basics.py b/tests/test_basics.py
index 4243cf2..7a9f317 100644
--- a/tests/test_basics.py
+++ b/tests/test_basics.py
@@ -3,6 +3,7 @@ from unittest.mock import MagicMock
 import bonobo
 import pytest
 from bonobo.config.processors import ContextCurrifier
+from bonobo.constants import NOT_MODIFIED
 
 
 def test_count():
@@ -24,3 +25,38 @@ def test_count():
     assert 0 == len(bag.kwargs)
     assert 1 == len(bag.args)
     assert bag.args[0] == 42
+
+
+def test_identity():
+    assert bonobo.identity(42) == 42
+
+
+def test_limit():
+    limit = bonobo.Limit(2)
+    results = []
+    for i in range(42):
+        results += list(limit())
+    assert results == [NOT_MODIFIED] * 2
+
+
+def test_limit_not_there():
+    limit = bonobo.Limit(42)
+    results = []
+    for i in range(10):
+        results += list(limit())
+    assert results == [NOT_MODIFIED] * 10
+
+
+def test_tee():
+    inner = MagicMock(side_effect=bonobo.identity)
+    tee = bonobo.Tee(inner)
+    results = []
+    for i in range(10):
+        results.append(tee('foo'))
+
+    assert results == [NOT_MODIFIED] * 10
+    assert len(inner.mock_calls) == 10
+
+
+def test_noop():
+    assert bonobo.noop(1, 2, 3, 4, foo='bar') == NOT_MODIFIED