diff --git a/tests.py b/tests.py
new file mode 100644
index 0000000..4a386b5
--- /dev/null
+++ b/tests.py
@@ -0,0 +1,23 @@
+import numpy as np
+from maxima import find_maxima
+
+
+def test_maxima(x, y, fn):
+    result = (y == fn(x))
+    print('x =', x, ', result:', result)
+    if(not result):
+        print('expected:', y, ', but found:', find_maxima(y))
+
+
+x1 = [0, 1, 2, 1, 2, 1, 0]
+y1 = [2, 4]
+test_maxima(x1, y1, find_maxima)
+x2 = [4, 2, 1, 3, 1, 2]
+y2 = [3]
+test_maxima(x2, y2, find_maxima)
+x3 = [1, 3, 2, 2, 1]
+y3 = [1]
+test_maxima(x3, y3, find_maxima)
+x4 = [1, 2, 2, 1]
+y4 = [1, 2]
+test_maxima(x4, y4, find_maxima)