Update tests failing because the RNG changed. Relax error bounds.

Author: dhardy

src/distributions/unit_circle.rs

@@ -95,8 +95,8 @@ mod tests {
     fn value_stability() {
         let mut rng = ::test::rng(2);
         let dist = UnitCircle::new();
-        assert_eq!(dist.sample(&mut rng), [-0.8150602311723979, 0.5793762331690843]);
-        assert_eq!(dist.sample(&mut rng), [-0.056204569973983196, 0.998419273809375]);
-        assert_eq!(dist.sample(&mut rng), [0.7761923749562624, -0.630496151502733]);
+        assert_eq!(dist.sample(&mut rng), [-0.8032118336637037, 0.5956935036263119]);
+        assert_eq!(dist.sample(&mut rng), [-0.4742919588505423, -0.880367615130018]);
+        assert_eq!(dist.sample(&mut rng), [0.9297328981467168, 0.368234623716601]);
     }
 }

src/distributions/unit_sphere.rs

@@ -91,10 +91,10 @@ mod tests {
         let mut rng = ::test::rng(2);
         let dist = UnitSphereSurface::new();
         assert_eq!(dist.sample(&mut rng),
-                   [0.1660727273690104, 0.5202698793511903, 0.8376986939610902]);
+                   [-0.24950027180862533, -0.7552572587896719, 0.6060825747478084]);
         assert_eq!(dist.sample(&mut rng),
-                   [0.40052443371799834, 0.4237054996596154, -0.812436968356975]);
+                   [0.47604534507233487, -0.797200864987207, -0.3712837328763685]);
         assert_eq!(dist.sample(&mut rng),
-                   [0.9209910250970449, -0.32692477745072107, 0.21188610520628948]);
+                   [0.9795722330927367, 0.18692349236651176, 0.07414747571708524]);
     }
 }

src/lib.rs

@@ -1102,7 +1102,8 @@ mod test {
                 sum += 1;
             }
         }
-        let avg = (sum as f64) / (N as f64);
-        assert!((avg - (NUM as f64)/(DENOM as f64)).abs() < 1e-3);
+        // Have Binomial(N, NUM/DENOM) distribution
+        let expected = (NUM * N) / DENOM;   // exact integer
+        assert!(((sum - expected) as i32).abs() < 500);
     }
 }

src/seq/mod.rs

@@ -616,8 +616,9 @@ mod test {
                 chosen[picked] += 1;
             }
             for count in chosen.iter() {
+                // Samples should follow Binomial(1000, 1/9)
                 let err = *count - 1000 / 9;
-                assert!(-25 <= err && err <= 25);
+                assert!(-30 <= err && err <= 30);
             }
         }