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LibJS: Add %TypedArray%.prototype.forEach

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Luke 2021-06-18 04:40:26 +01:00 • committed by Linus Groh
parent 91af985718
commit 68f11a272b
3 changed files with 156 additions and 0 deletions
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145
Userland/Libraries/LibJS/Tests/builtins/TypedArray/TypedArray.prototype.forEach.js Normal file
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const TYPED_ARRAYS = [
Uint8Array,
Uint16Array,
Uint32Array,
Int8Array,
Int16Array,
Int32Array,
Float32Array,
Float64Array,
];
const BIGINT_TYPED_ARRAYS = [BigUint64Array, BigInt64Array];
test("length is 1", () => {
TYPED_ARRAYS.forEach(T => {
expect(T.prototype.forEach).toHaveLength(1);
});
BIGINT_TYPED_ARRAYS.forEach(T => {
expect(T.prototype.forEach).toHaveLength(1);
});
});
describe("errors", () => {
function errorTests(T) {
test(`requires at least one argument (${T.name})`, () => {
expect(() => {
new T().forEach();
}).toThrowWithMessage(
TypeError,
"TypedArray.prototype.forEach() requires at least one argument"
);
});
test(`callback must be a function (${T.name})`, () => {
expect(() => {
new T().forEach(undefined);
}).toThrowWithMessage(TypeError, "undefined is not a function");
});
}
TYPED_ARRAYS.forEach(T => errorTests(T));
BIGINT_TYPED_ARRAYS.forEach(T => errorTests(T));
});
describe("normal behaviour", () => {
test("never calls callback with empty array", () => {
function emptyTest(T) {
var callbackCalled = 0;
expect(
new T().forEach(() => {
callbackCalled++;
})
).toBeUndefined();
expect(callbackCalled).toBe(0);
}
TYPED_ARRAYS.forEach(T => emptyTest(T));
BIGINT_TYPED_ARRAYS.forEach(T => emptyTest(T));
});
test("calls callback once for every item", () => {
TYPED_ARRAYS.forEach(T => {
var callbackCalled = 0;
expect(
new T([1, 2, 3]).forEach(() => {
callbackCalled++;
})
).toBeUndefined();
expect(callbackCalled).toBe(3);
});
BIGINT_TYPED_ARRAYS.forEach(T => {
var callbackCalled = 0;
expect(
new T([1n, 2n, 3n]).forEach(() => {
callbackCalled++;
})
).toBeUndefined();
expect(callbackCalled).toBe(3);
});
});
test("callback receives value and index", () => {
TYPED_ARRAYS.forEach(T => {
const typedArray = new T([1, 2, 3]);
typedArray.forEach((value, index) => {
expect(value).toBe(typedArray[index]);
expect(index).toBe(typedArray[index] - 1);
});
});
BIGINT_TYPED_ARRAYS.forEach(T => {
const typedArray = new T([1n, 2n, 3n]);
typedArray.forEach((value, index) => {
expect(value).toBe(typedArray[index]);
expect(index).toBe(parseInt(typedArray[index] - 1n));
});
});
});
test("callback receives array", () => {
TYPED_ARRAYS.forEach(T => {
var callbackCalled = 0;
const typedArray = new T([1, 2, 3]);
typedArray.forEach((_, __, array) => {
callbackCalled++;
expect(typedArray).toEqual(array);
});
expect(callbackCalled).toBe(3);
});
BIGINT_TYPED_ARRAYS.forEach(T => {
var callbackCalled = 0;
const typedArray = new T([1n, 2n, 3n]);
typedArray.forEach((_, __, array) => {
callbackCalled++;
expect(typedArray).toEqual(array);
});
expect(callbackCalled).toBe(3);
});
});
test("this value can be modified", () => {
TYPED_ARRAYS.forEach(T => {
const typedArray = new T([1, 2, 3]);
[4, 5, 6].forEach(function (value, index) {
this[index] = value;
}, typedArray);
expect(typedArray[0]).toBe(4);
expect(typedArray[1]).toBe(5);
expect(typedArray[2]).toBe(6);
});
BIGINT_TYPED_ARRAYS.forEach(T => {
const typedArray = new T([1n, 2n, 3n]);
[4n, 5n, 6n].forEach(function (value, index) {
this[index] = value;
}, typedArray);
expect(typedArray[0]).toBe(4n);
expect(typedArray[1]).toBe(5n);
expect(typedArray[2]).toBe(6n);
});
});
});