diff --git a/SolMuseum/num_api/pde/test/__init__.py b/SolMuseum/num_api/pde/test/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/SolMuseum/num_api/pde/test/test_minmod.py b/SolMuseum/num_api/pde/test/test_minmod.py
new file mode 100644
index 0000000..9bdead6
--- /dev/null
+++ b/SolMuseum/num_api/pde/test/test_minmod.py
@@ -0,0 +1,24 @@
+import numpy as np
+from ..minmod_limiter import minmod, minmod_flag, switch_minmod
+
+
+def test_minmod():
+    a = np.array([-1, 1, 2, 4.])
+    b = np.array([-3, 2, 0, 0])
+    c = np.array([-5, 3, -1, 1.])
+    np.testing.assert_allclose(minmod(a, b, c), np.array([-1, 1, 0, 0.]))
+
+
+def test_minmod_flag():
+    a = np.array([-1, 3, 2, -4, 5, 10])
+    b = np.array([-3, 2, 1, -2, 0, -1])
+    c = np.array([-5, 1, 1, -5.4, 1, 2])
+    np.testing.assert_allclose(minmod_flag(a, b, c), np.array([1, 3, 2, 2, 0, 0]))
+
+
+def test_switch_minmod():
+    a = np.array([-1, 3, 2, -4, 5, 10])
+    b = np.array([-3, 2, 1, -2, 0, -1])
+    c = np.array([-5, 1, 1, -5.4, 1, 2])
+    flag = minmod_flag(a, b, c)
+    np.testing.assert_allclose(switch_minmod(a, b, c, flag), np.array([-1, 1, 1, -2, 0, 0.0]))