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test("extending function", () => {
class A extends function () {
this.foo = 10;
} {}
expect(new A().foo).toBe(10);
});
test("extending null", () => {
class A extends null {}
expect(Object.getPrototypeOf(A.prototype)).toBeNull();
expect(() => {
new A();
}).toThrowWithMessage(TypeError, "Super constructor is not a constructor");
});
test("extending String", () => {
class MyString extends String {}
const ms = new MyString("abc");
expect(ms).toBeInstanceOf(MyString);
expect(ms).toBeInstanceOf(String);
expect(ms.charAt(1)).toBe("b");
class MyString2 extends MyString {
charAt(i) {
return `#${super.charAt(i)}`;
}
}
const ms2 = new MyString2("abc");
expect(ms2.charAt(1)).toBe("#b");
});
test("class extends value is invalid", () => {
expect(() => {
class A extends 123 {}
}).toThrowWithMessage(TypeError, "Class extends value 123 is not a constructor or null");
});
test("class extends value has invalid prototype", () => {
function f() {}
f.prototype = 123;
expect(() => {
class A extends f {}
}).toThrowWithMessage(TypeError, "Class extends value has an invalid prototype 123");
});
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