diff --git a/src/bigint.rs b/src/bigint.rs
index ca46895..55472c2 100644
--- a/src/bigint.rs
+++ b/src/bigint.rs
@@ -887,7 +887,7 @@ mod tests {
 
     #[test]
     fn test_not() {
-        let a = BigInt::from(0u8);
+        let a = BigInt::from(0_u8);
         let b = !a;
 
         assert_eq!(b.inner[0], core::usize::MAX);
@@ -895,7 +895,7 @@ mod tests {
 
     #[test]
     fn test_partial_eq() {
-        let a = 12345u16;
+        let a = 12345_u16;
         let b = BigInt::from(a);
 
         assert!(a.eq(&b));
@@ -904,9 +904,9 @@ mod tests {
 
     #[test]
     fn test_partial_ord() {
-        let a = 12345u32;
+        let a = 12345_u32;
         let b = BigInt::from(a);
-        let c = 3u8;
+        let c = 3_u8;
 
         assert_eq!(a.partial_cmp(&b), Some(Ordering::Equal));
         assert_eq!(c.partial_cmp(&b), Some(Ordering::Less));
@@ -924,7 +924,7 @@ mod tests {
         assert_eq!(-BigInt::from(2), BigInt::from(-2));
 
         // Larger than usize
-        assert_eq!(BigInt::from(45u128), BigInt::from(45usize));
+        assert_eq!(BigInt::from(45_u128), BigInt::from(45_usize));
     }
 
     #[test]
@@ -933,8 +933,8 @@ mod tests {
         let res = BigInt::from(big_num);
 
         assert_eq!(res.sign, Sign::Positive, "{:#?}", res);
-        assert_eq!(res.inner[0], 8usize, "{:#?}", res);
-        assert_eq!(res.inner[1], 9usize, "{:#?}", res);
+        assert_eq!(res.inner[0], 8_usize, "{:#?}", res);
+        assert_eq!(res.inner[1], 9_usize, "{:#?}", res);
     }
 
     #[test]
@@ -943,8 +943,8 @@ mod tests {
         let res = BigInt::from(-big_num);
 
         assert_eq!(res.sign, Sign::Negative, "{:#?}", res);
-        assert_eq!(res.inner[0], 3usize, "{:#?}", res);
-        assert_eq!(res.inner[1], 2usize, "{:#?}", res);
+        assert_eq!(res.inner[0], 3_usize, "{:#?}", res);
+        assert_eq!(res.inner[1], 2_usize, "{:#?}", res);
     }
 
     #[test]
@@ -958,7 +958,7 @@ mod tests {
     fn test_from_str_small() {
         let str = "012345";
         let num = BigInt::from(str);
-        assert_eq!(num.inner[0], 12345usize);
+        assert_eq!(num.inner[0], 12345_usize);
     }
 
     #[test]
@@ -972,20 +972,36 @@ mod tests {
     fn test_from_string_small() {
         let str = String::from("012345");
         let num = BigInt::from(str);
-        assert_eq!(num.inner[0], 12345usize);
+        assert_eq!(num.inner[0], 12345_usize);
     }
 
     #[test]
     fn test_from_str_radix_1() {
         let s = "1".repeat(32);
         let num = BigInt::from_str_radix(s, 1);
-        assert_eq!(num.inner[0], 32usize);
+        assert_eq!(num.inner[0], 32_usize);
+    }
+
+    #[test]
+    fn test_from_str_radix_1_with_zeroes() {
+        let ones = "1".repeat(32);
+        let zeroes = "0".repeat(24);
+        let s = ones + &zeroes;
+
+        let num = BigInt::from_str_radix(s, 1);
+        assert_eq!(num.inner[0], 32_usize);
+    }
+
+    #[test]
+    #[should_panic]
+    fn test_from_str_radix_invalid() {
+        let _ = BigInt::from_str_radix("foobar0", 50);
     }
 
     #[test]
     #[should_panic]
     fn test_from_str_radix_large() {
-        BigInt::from_str_radix("ZYXWVUTSRQPONMLKJIHGFEDCBA987654321", 36);
+        let _ = BigInt::from_str_radix("ZYXWVUTSRQPONMLKJIHGFEDCBA987654321", 36);
     }
 
     #[test]
@@ -993,12 +1009,12 @@ mod tests {
         let num = BigInt::from_str_radix("FEDCBA", 16);
         assert!(num.inner[0] > 0, "Number is not greater than 0");
         assert!(num.inner[0] < usize::MAX, "Result is larger than usize");
-        assert_eq!(num.inner[0], 0xFEDCBAusize);
+        assert_eq!(num.inner[0], 0xFEDCBA_usize);
     }
 
     #[test]
     fn test_from_str_radix_lowercase() {
         let num = BigInt::from_str_radix("fedcba", 16);
-        assert_eq!(num.inner[0], 0xFEDCBAusize);
+        assert_eq!(num.inner[0], 0xFEDCBA_usize);
     }
 }