1 files changed, 39 insertions, 0 deletions
diff --git a/circuitpython/tools/huffman/tests/test_util.py b/circuitpython/tools/huffman/tests/test_util.py
new file mode 100644
index 0000000..099d009
--- /dev/null
+++ b/circuitpython/tools/huffman/tests/test_util.py
@@ -0,0 +1,39 @@
+from __future__ import absolute_import, print_function
+
+import random
+import unittest
+
+from .util import is_sorted, popper
+
+class TestIsSorted(unittest.TestCase):
+
+    def test_is_sorted(self):
+        assert is_sorted([1])
+        assert is_sorted([1, 2])
+        assert is_sorted([1, 2, 3])
+        assert is_sorted([1, 2, 2])
+        assert is_sorted([2, 2, 2])
+        assert is_sorted([])
+        assert is_sorted((1, 2, 3))
+        assert is_sorted('abc')
+        assert is_sorted('123')
+        assert is_sorted('eggs')
+        assert is_sorted(iter([1, 2, 3]))
+
+    def test_is_not_sorted(self):
+        assert not is_sorted([3, 2, 1])
+        assert not is_sorted([2, 2, 1])
+        assert not is_sorted('spam')
+
+
+class TestPopper(unittest.TestCase):
+
+    def test_popper(self):
+        for i in range(10):
+            x = list(range(i))
+
+            j = 0
+            for _ in popper(x):
+                j += 1
+
+            self.assertEqual(i, j)