diff --git a/tests/80_easing.py b/tests/80_easing.py
new file mode 100644
index 00000000..ee5cede5
--- /dev/null
+++ b/tests/80_easing.py
@@ -0,0 +1,12 @@
+import easing
+
+def validate(val):
+    assert -2 <= val <= 2.0
+    assert isinstance(val, float)
+
+for k, f in easing.__dict__.items():
+    if k.startswith("Ease"):
+        validate(f(0.2))
+        validate(f(0.5))
+        validate(f(0.8))
+        validate(f(1.0))