test: fmod with a variety of values/signs

nannou-org · Nov 26, 2024 · d02ca3b · d02ca3b
1 parent e93219d
commit d02ca3b
Showing 1 changed file with 24 additions and 0 deletions.
diff --git a/nannou_core/src/math.rs b/nannou_core/src/math.rs
@@ -243,3 +243,27 @@ where
 {
     s.rad_to_turns()
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use float_eq::assert_float_eq;
+
+    #[test]
+    fn test_fmod() {
+        /*
+            Test values sourced from:
+            https://en.cppreference.com/w/c/numeric/math/fmod
+        */
+        assert_float_eq!(fmod(5.1, 3.0), 2.1, r2nd <= Float::epsilon());
+        assert_float_eq!(fmod(-5.1, 3.0), -2.1, r2nd <= Float::epsilon());
+        assert_float_eq!(fmod(5.1, -3.0), 2.1, r2nd <= Float::epsilon());
+        assert_float_eq!(fmod(-5.1, -3.0), -2.1, r2nd <= Float::epsilon());
+
+        assert_float_eq!(fmod(0.0, 1.0), 0.0, r2nd <= Float::epsilon());
+        assert_float_eq!(fmod(-0.0, 1.0), -0.0, r2nd <= Float::epsilon());
+
+        assert!(fmod(5.1, Float::infinity()).is_sign_negative());
+        assert!(fmod(5.1, Float::infinity()).is_nan());
+    }
+}