62 lines
2.7 KiB
JavaScript
62 lines
2.7 KiB
JavaScript
"use strict";
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test(() => {
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assert_own_property(Blob.prototype, Symbol.toStringTag);
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const propDesc = Object.getOwnPropertyDescriptor(Blob.prototype, Symbol.toStringTag);
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assert_equals(propDesc.value, "Blob", "value");
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assert_equals(propDesc.configurable, true, "configurable");
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assert_equals(propDesc.enumerable, false, "enumerable");
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assert_equals(propDesc.writable, false, "writable");
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}, "@@toStringTag exists on the prototype with the appropriate descriptor");
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test(() => {
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assert_not_own_property(new Blob(), Symbol.toStringTag);
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}, "@@toStringTag must not exist on the instance");
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test(() => {
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assert_equals(Object.prototype.toString.call(Blob.prototype), "[object Blob]");
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}, "Object.prototype.toString applied to the prototype");
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test(() => {
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assert_equals(Object.prototype.toString.call(new Blob()), "[object Blob]");
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}, "Object.prototype.toString applied to an instance");
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test(t => {
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assert_own_property(Blob.prototype, Symbol.toStringTag, "Precondition for this test: @@toStringTag on the prototype");
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t.add_cleanup(() => {
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Object.defineProperty(Blob.prototype, Symbol.toStringTag, { value: "Blob" });
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});
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Object.defineProperty(Blob.prototype, Symbol.toStringTag, { value: "NotABlob" });
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assert_equals(Object.prototype.toString.call(Blob.prototype), "[object NotABlob]", "prototype");
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assert_equals(Object.prototype.toString.call(new Blob()), "[object NotABlob]", "instance");
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}, "Object.prototype.toString applied after modifying the prototype's @@toStringTag");
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test(t => {
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const instance = new Blob();
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assert_not_own_property(instance, Symbol.toStringTag, "Precondition for this test: no @@toStringTag on the instance");
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Object.defineProperty(instance, Symbol.toStringTag, { value: "NotABlob" });
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assert_equals(Object.prototype.toString.call(instance), "[object NotABlob]");
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}, "Object.prototype.toString applied to the instance after modifying the instance's @@toStringTag");
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// Chrome had a bug (https://bugs.chromium.org/p/chromium/issues/detail?id=793406) where if there
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// was no @@toStringTag in the prototype, it would fall back to a magic class string. This tests
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// that the bug is fixed.
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test(() => {
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const instance = new Blob();
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Object.setPrototypeOf(instance, null);
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assert_equals(Object.prototype.toString.call(instance), "[object Object]");
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}, "Object.prototype.toString applied to a null-prototype instance");
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// This test must be last.
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test(() => {
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delete Blob.prototype[Symbol.toStringTag];
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assert_equals(Object.prototype.toString.call(Blob.prototype), "[object Object]", "prototype");
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assert_equals(Object.prototype.toString.call(new Blob()), "[object Object]", "instance");
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}, "Object.prototype.toString applied after deleting @@toStringTag");
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