add docstring tests to Stdlib.BigInt

Author: tsnobip

runtime/Stdlib_BigInt.res

@@ -16,26 +16,20 @@ number as a `bigint` if successfully parsed. Uncaught syntax exception otherwise
 ## Examples
 
 ```rescript
-/* returns 123n */
-BigInt.fromStringExn("123")
+BigInt.fromStringExn("123")->assertEqual(123n)
 
-/* returns 0n */
-BigInt.fromStringExn("")
+BigInt.fromStringExn("")->assertEqual(0n)
 
-/* returns 17n */
-BigInt.fromStringExn("0x11")
+BigInt.fromStringExn("0x11")->assertEqual(17n)
 
-/* returns 3n */
-BigInt.fromStringExn("0b11")
+BigInt.fromStringExn("0b11")->assertEqual(3n)
 
-/* returns 9n */
-BigInt.fromStringExn("0o11")
+BigInt.fromStringExn("0o11")->assertEqual(9n)
 
 /* catch exception */
-try {
-  BigInt.fromStringExn("a")
-} catch {
-| Exn.Error(_error) => 0n
+switch BigInt.fromStringExn("a") {
+| exception Exn.Error(_error) => assert(true)
+| _bigInt => assert(false)
 }
 ```
 */
@@ -51,8 +45,7 @@ See [`toString`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Referen
 ## Examples
 
 ```rescript
-/* prints "123" */
-BigInt.toString(123n)->Console.log
+BigInt.toString(123n)->assertEqual("123")
 ```
 */
 external toString: (bigint, ~radix: int=?) => string = "toString"
@@ -67,8 +60,7 @@ Returns a string with a language-sensitive representation of this BigInt value.
 ## Examples
 
 ```rescript
-/* prints "123" */
-BigInt.toString(123n)->Console.log
+BigInt.toString(123n)->assertEqual("123")
 ```
 */
 external toLocaleString: bigint => string = "toLocaleString"