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-rw-r--r--tests/test.mew7
1 files changed, 7 insertions, 0 deletions
diff --git a/tests/test.mew b/tests/test.mew
index 1fe7ec1..72d1e27 100644
--- a/tests/test.mew
+++ b/tests/test.mew
@@ -83,6 +83,13 @@
   (test 5 (mod -16 7))
   (test -2 (mod -16 -7)))
 
+(test-group "sgn"
+  (test -1 (sgn -42))
+  (test 0 (sgn 0))
+  (test #t (eq? 0 (sgn 0.0)))
+  (test #t (eq? 0 (sgn -0.0)))
+  (test 1 (sgn 42)))
+
 (test-group "inc"
   (test 6 (inc 5))
   (test 0 (inc -1))