diff --git a/src/distribution/uniform.rs b/src/distribution/uniform.rs
index 1b672f03..30b42bc3 100644
--- a/src/distribution/uniform.rs
+++ b/src/distribution/uniform.rs
@@ -264,7 +264,7 @@ mod tests {
 
     fn try_create(min: f64, max: f64) -> Uniform {
         let n = Uniform::new(min, max);
-        assert!(n.is_ok());
+        assert!(n.is_ok(), "failed create over interval [{}, {}]", min, max);
         n.unwrap()
     }
 
@@ -304,19 +304,19 @@ mod tests {
 
     #[test]
     fn test_create() {
-        create_case(0.0, 0.0);
         create_case(0.0, 0.1);
         create_case(0.0, 1.0);
-        create_case(10.0, 10.0);
         create_case(-5.0, 11.0);
         create_case(-5.0, 100.0);
     }
 
     #[test]
     fn test_bad_create() {
+        bad_create_case(0.0, 0.0);
         bad_create_case(f64::NAN, 1.0);
         bad_create_case(1.0, f64::NAN);
         bad_create_case(f64::NAN, f64::NAN);
+        bad_create_case(0.0, f64::INFINITY);
         bad_create_case(1.0, 0.0);
     }
 
@@ -327,7 +327,6 @@ mod tests {
         test_case(0.0, 2.0, 1.0 / 3.0, variance);
         test_almost(0.1, 4.0, 1.2675, 1e-15, variance);
         test_case(10.0, 11.0, 1.0 / 12.0, variance);
-        test_case(0.0, f64::INFINITY, f64::INFINITY, variance);
     }
 
     #[test]
@@ -338,7 +337,6 @@ mod tests {
         test_almost(0.1, 4.0, 1.360976553135600743431, 1e-15, entropy);
         test_case(1.0, 10.0, 2.19722457733621938279, entropy);
         test_case(10.0, 11.0, 0.0, entropy);
-        test_case(0.0, f64::INFINITY, f64::INFINITY, entropy);
     }
 
     #[test]
@@ -349,7 +347,6 @@ mod tests {
         test_case(0.1, 4.0, 0.0, skewness);
         test_case(1.0, 10.0, 0.0, skewness);
         test_case(10.0, 11.0, 0.0, skewness);
-        test_case(0.0, f64::INFINITY, 0.0, skewness);
     }
 
     #[test]
@@ -360,7 +357,6 @@ mod tests {
         test_case(0.1, 4.0, 2.05, mode);
         test_case(1.0, 10.0, 5.5, mode);
         test_case(10.0, 11.0, 10.5, mode);
-        test_case(0.0, f64::INFINITY, f64::INFINITY, mode);
     }
 
     #[test]
@@ -371,15 +367,11 @@ mod tests {
         test_case(0.1, 4.0, 2.05, median);
         test_case(1.0, 10.0, 5.5, median);
         test_case(10.0, 11.0, 10.5, median);
-        test_case(0.0, f64::INFINITY, f64::INFINITY, median);
     }
 
     #[test]
     fn test_pdf() {
         let pdf = |arg: f64| move |x: Uniform| x.pdf(arg);
-        test_case(0.0, 0.0, 0.0, pdf(-5.0));
-        test_case(0.0, 0.0, f64::INFINITY, pdf(0.0));
-        test_case(0.0, 0.0, 0.0, pdf(5.0));
         test_case(0.0, 0.1, 0.0, pdf(-5.0));
         test_case(0.0, 0.1, 10.0, pdf(0.05));
         test_case(0.0, 0.1, 0.0, pdf(5.0));
@@ -394,17 +386,11 @@ mod tests {
         test_case(-5.0, 100.0, 0.009523809523809523809524, pdf(-5.0));
         test_case(-5.0, 100.0, 0.009523809523809523809524, pdf(0.0));
         test_case(-5.0, 100.0, 0.0, pdf(101.0));
-        test_case(0.0, f64::INFINITY, 0.0, pdf(-5.0));
-        test_case(0.0, f64::INFINITY, 0.0, pdf(10.0));
-        test_case(0.0, f64::INFINITY, 0.0, pdf(f64::INFINITY));
     }
 
     #[test]
     fn test_ln_pdf() {
         let ln_pdf = |arg: f64| move |x: Uniform| x.ln_pdf(arg);
-        test_case(0.0, 0.0, f64::NEG_INFINITY, ln_pdf(-5.0));
-        test_case(0.0, 0.0, f64::INFINITY, ln_pdf(0.0));
-        test_case(0.0, 0.0, f64::NEG_INFINITY, ln_pdf(5.0));
         test_case(0.0, 0.1, f64::NEG_INFINITY, ln_pdf(-5.0));
         test_almost(0.0, 0.1, 2.302585092994045684018, 1e-15, ln_pdf(0.05));
         test_case(0.0, 0.1, f64::NEG_INFINITY, ln_pdf(5.0));
@@ -419,38 +405,27 @@ mod tests {
         test_case(-5.0, 100.0, -4.653960350157523371101, ln_pdf(-5.0));
         test_case(-5.0, 100.0, -4.653960350157523371101, ln_pdf(0.0));
         test_case(-5.0, 100.0, f64::NEG_INFINITY, ln_pdf(101.0));
-        test_case(0.0, f64::INFINITY, f64::NEG_INFINITY, ln_pdf(-5.0));
-        test_case(0.0, f64::INFINITY, f64::NEG_INFINITY, ln_pdf(10.0));
-        test_case(0.0, f64::INFINITY, f64::NEG_INFINITY, ln_pdf(f64::INFINITY));
     }
 
     #[test]
     fn test_cdf() {
         let cdf = |arg: f64| move |x: Uniform| x.cdf(arg);
-        test_case(0.0, 0.0, 0.0, cdf(0.0));
         test_case(0.0, 0.1, 0.5, cdf(0.05));
         test_case(0.0, 1.0, 0.5, cdf(0.5));
         test_case(0.0, 10.0, 0.1, cdf(1.0));
         test_case(0.0, 10.0, 0.5, cdf(5.0));
         test_case(-5.0, 100.0, 0.0, cdf(-5.0));
         test_case(-5.0, 100.0, 0.04761904761904761904762, cdf(0.0));
-        test_case(0.0, f64::INFINITY, 0.0, cdf(10.0));
-        test_case(0.0, f64::INFINITY, 1.0, cdf(f64::INFINITY));
     }
 
     #[test]
     fn test_inverse_cdf() {
         let inverse_cdf = |arg: f64| move |x: Uniform| x.inverse_cdf(arg);
-        test_case(0.0, 0.0, 0.0, inverse_cdf(0.0));
-        test_case(0.0, 0.0, 0.0, inverse_cdf(1.0));
         test_case(0.0, 0.1, 0.05, inverse_cdf(0.5));
         test_case(0.0, 10.0, 5.0, inverse_cdf(0.5));
         test_case(1.0, 10.0, 1.0, inverse_cdf(0.0));
         test_case(1.0, 10.0, 4.0, inverse_cdf(1.0 / 3.0));
         test_case(1.0, 10.0, 10.0, inverse_cdf(1.0));
-        test_case(f64::NEG_INFINITY, f64::INFINITY, f64::NEG_INFINITY, inverse_cdf(0.0));
-        test_case(0.0, f64::INFINITY, 0.0, inverse_cdf(0.0));
-        test_case(0.0, f64::INFINITY, f64::INFINITY, inverse_cdf(1.0));
     }
 
     #[test]
@@ -469,15 +444,12 @@ mod tests {
     #[test]
     fn test_sf() {
         let sf = |arg: f64| move |x: Uniform| x.sf(arg);
-        test_case(0.0, 0.0, 1.0, sf(0.0));
         test_case(0.0, 0.1, 0.5, sf(0.05));
         test_case(0.0, 1.0, 0.5, sf(0.5));
         test_case(0.0, 10.0, 0.9, sf(1.0));
         test_case(0.0, 10.0, 0.5, sf(5.0));
         test_case(-5.0, 100.0, 1.0, sf(-5.0));
         test_case(-5.0, 100.0, 0.9523809523809523, sf(0.0));
-        test_case(0.0, f64::INFINITY, 1.0, sf(10.0));
-        test_case(0.0, f64::INFINITY, 0.0, sf(f64::INFINITY));
     }
 
     #[test]