Added a custom epsilon for tests.

src/lib.rs

@@ -301,6 +301,8 @@ mod tests {
 
     use super::*;
 
+    const EPSILON: f64 = 2e-14;
+
     impl AbsDiffEq for Rating {
         type Epsilon = f64;
 
@@ -336,7 +338,7 @@ mod tests {
         let alice = Rating::new(MU, SIGMA);
         let bob = Rating::new(MU, SIGMA);
 
-        assert_relative_eq!(quality(&[&[alice], &[bob]]), 0.4472135954999579);
+        assert_relative_eq!(quality(&[&[alice], &[bob]]), 0.4472135954999579, epsilon = EPSILON);
     }
 
     #[test]
@@ -356,7 +358,7 @@ mod tests {
         let ratings = rate(&[&[alice], &[bob], &[chris], &[darren]]);
 
         for (rating, expected) in ratings.iter().zip(expected_ratings.iter()) {
-            assert_relative_eq!(rating, expected);
+            assert_relative_eq!(rating, expected, epsilon = EPSILON);
         }
     }
 }