fix(std/testing): formatting bigint (#4626)

1 files changed, 7 insertions, 0 deletions

diff --git a/std/testing/format.ts b/std/testing/format.ts
index ee291dc23..4004ebc9d 100644
--- a/std/testing/format.ts
+++ b/std/testing/format.ts
@@ -115,6 +115,10 @@ function printSymbol(val: symbol): string {
   return symbolToString.call(val).replace(SYMBOL_REGEXP, "Symbol($1)");
 }
 
+function printBigInt(val: bigint): string {
+  return val.toString() + "n";
+}
+
 function printError(val: Error): string {
   return "[" + errorToString.call(val) + "]";
 }
@@ -155,6 +159,9 @@ function printBasicValue(
   if (typeOf === "symbol") {
     return printSymbol(val);
   }
+  if (typeOf === "bigint") {
+    return printBigInt(val);
+  }
 
   const toStringed = toString.call(val);