Add tests for BigInt.prototype.valueOf (#1234)

* BigInt valueOf tests

* add features from typeCoercion.js

1 files changed, 16 insertions, 0 deletions

diff --git a/harness/typeCoercion.js b/harness/typeCoercion.js
index 7cd6a9de3..76d366d76 100644
--- a/harness/typeCoercion.js
+++ b/harness/typeCoercion.js
@@ -407,3 +407,19 @@ function testNotCoercibleToBigInt(test) {
   testStringValue("0xg");
   testStringValue("1n");
 }
+
+function testCoercibleToBigIntThisValue(value, test) {
+  test(value);
+  test(Object(value));
+}
+
+function testNotCoercibleToBigIntThisValue(test) {
+  test(undefined);
+  test(null);
+  test(true);
+  test(false);
+  test("");
+  test(Symbol(""));
+  test(0);
+  test({});
+}