diff --git a/src/math/floorf.rs b/src/math/floorf.rs
index 7d631df..8a63874 100644
--- a/src/math/floorf.rs
+++ b/src/math/floorf.rs
@@ -37,3 +37,11 @@ pub fn floorf(x: f32) -> f32 {
     }
     return f32::from_bits(ui);
 }
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn no_overflow() {
+        assert_eq!(super::floorf(0.5), 0.0);
+    }
+}