Test Date.prototype.toJSON called as top-level function

test/built-ins/Date/prototype/toJSON/called-as-function.js

@@ -0,0 +1,32 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-date.prototype.tojson
+description: >
+    `this` value is resolved using strict mode semantics,
+    throwing TypeError if called as top-level function.
+info: |
+    Date.prototype.toJSON ( key )
+
+    1. Let O be ? ToObject(this value).
+
+    ToObject ( argument )
+
+    Argument Type: Undefined
+    Result: Throw a TypeError exception.
+features: [Symbol, Symbol.toPrimitive]
+---*/
+
+[Symbol.toPrimitive, "toString", "valueOf", "toISOString"].forEach(function(key) {
+    Object.defineProperty(this, key, {
+        get: function() {
+            throw new Test262Error(String(key) + " lookup should not be performed");
+        },
+    });
+}, this);
+
+var toJSON = Date.prototype.toJSON;
+assert.throws(TypeError, function() {
+    toJSON();
+});