diff --git a/tests/tools_test.py b/tests/tools_test.py
new file mode 100644
index 0000000..71c5267
--- /dev/null
+++ b/tests/tools_test.py
@@ -0,0 +1,25 @@
+
+
+from corrlib import tools as tl
+
+
+def test_m2k():
+    assert tl.m2k(0.1) == 1/(2*0.1+8)
+    assert tl.m2k(0.5) == 1/(2*0.5+8)
+    assert tl.m2k(1.0) == 1/(2*1.0+8)
+
+
+def test_k2m():
+    assert tl.k2m(0.1) == (1/(2*0.1))-4
+    assert tl.k2m(0.5) == (1/(2*0.5))-4
+    assert tl.k2m(1.0) == (1/(2*1.0))-4
+
+
+def test_str2list():
+    assert tl.str2list("a,b,c") == ["a", "b", "c"]
+    assert tl.str2list("1,2,3") == ["1", "2", "3"]
+
+
+def test_list2str():
+    assert tl.list2str(["a", "b", "c"]) == "a,b,c"
+    assert tl.list2str(["1", "2", "3"]) == "1,2,3"