Merge pull request #1331 from vks/try-from-panic

Add tests for `Uniform::try_from` with invalid ranges

Author: vks

Diff for: src/distributions/uniform.rs

@@ -1678,6 +1678,14 @@ mod tests {
         assert_eq!(r.0.scale, 5.0);
     }
 
+    #[test]
+    fn test_uniform_from_std_range_bad_limits() {
+        assert!(Uniform::try_from(100..10).is_err());
+        assert!(Uniform::try_from(100..100).is_err());
+        assert!(Uniform::try_from(100.0..10.0).is_err());
+        assert!(Uniform::try_from(100.0..100.0).is_err());
+    }
+
     #[test]
     fn test_uniform_from_std_range_inclusive() {
         let r = Uniform::try_from(2u32..=6).unwrap();
@@ -1689,6 +1697,14 @@ mod tests {
         assert!(r.0.scale < 5.0 + 1e-14);
     }
 
+    #[test]
+    fn test_uniform_from_std_range_inclusive_bad_limits() {
+        assert!(Uniform::try_from(100..=10).is_err());
+        assert!(Uniform::try_from(100..=99).is_err());
+        assert!(Uniform::try_from(100.0..=10.0).is_err());
+        assert!(Uniform::try_from(100.0..=99.0).is_err());
+    }
+
     #[test]
     fn value_stability() {
         fn test_samples<T: SampleUniform + Copy + core::fmt::Debug + PartialEq>(