update tests to follow review

Author: mysticatea

test/language/expressions/object/literal-property-name-bigint.js

@@ -1,4 +1,4 @@
-// Copyright (C) 2019 Igalia S.L, Toru Nagashima. All rights reserved.
+// Copyright (C) 2020 Igalia S.L, Toru Nagashima. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
@@ -33,28 +33,22 @@ let o = { 999999999999999999n: true }; // greater than max safe integer
 assert.sameValue(o["999999999999999999"], true,
     "the property name must be the string representation of the numeric value.");
 
-o = { 1n: "foo" };
-assert.sameValue(o[1n], "foo");
-assert.sameValue(o[1], "foo");
-assert.sameValue(o["1"], "foo");
-
 // MethodDeclaration
 
 o = { 1n() { return "bar"; } };
-assert.sameValue(o[1n](), "bar");
-assert.sameValue(o[1](), "bar");
-assert.sameValue(o["1"](), "bar");
+assert.sameValue(o["1"](), "bar",
+    "the property name must be the string representation of the numeric value.");
 
 class C {
   1n() { return "baz"; }
 }
 
 let c = new C();
-assert.sameValue(c[1n](), "baz");
-assert.sameValue(c[1](), "baz");
-assert.sameValue(c["1"](), "baz");
+assert.sameValue(c["1"](), "baz",
+    "the property name must be the string representation of the numeric value.");
 
 // Destructuring
 
-let {1n: a} = {1n: "foo"};
-assert.sameValue(a, "foo");
+let { 1n: a } = { "1": "foo" };
+assert.sameValue(a, "foo",
+    "the property name must be the string representation of the numeric value.");