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// Suite for the WHATWG base64 globals, atob() and btoa().

// The suite gates itself on the API being present, so it can sit in

// runAllTests() on every runtime and report a visible pending spec where the

// base64 globals do not exist yet, rather than being wired in per-runtime.

// A runtime that DOES implement them must keep an unguarded canary in its own

// suite asserting the globals are there (on iOS:

// TestRunner/app/tests/RuntimeImplementedAPIs.js). Without one, this gate would

// quietly turn a regression that removed the API into a skipped suite.

// Failures are asserted by `.name === "InvalidCharacterError"` rather than by

// `instanceof DOMException`: runtimes without a DOMException throw a plain

// Error carrying that name.

var globalObject = typeof globalThis !== "undefined" ? globalThis : global;

if (typeof globalObject.atob === "undefined" || typeof globalObject.btoa === "undefined") {

describe("base64 globals", function () {

it("is skipped: this runtime does not implement atob/btoa", function () {

pending();

});

return;

}

function captureThrown(fn) {

try {

fn();

} catch (e) {

return e;

}

return null;

}

function expectThrowsNamed(fn, name) {

var thrown = captureThrown(fn);

expect(thrown).not.toBeNull();

expect(thrown && thrown.name).toBe(name);

return thrown;

}

function expectInvalidCharacter(fn) {

return expectThrowsNamed(fn, "InvalidCharacterError");

}

function binaryString(list) {

var text = "";

for (var i = 0; i < list.length; i++) {

text += String.fromCharCode(list[i]);

}

return text;

}

function everyByte() {

var list = [];

for (var i = 0; i < 256; i++) {

list.push(i);

}

return list;

}

describe("btoa", function () {

it("is a function on the global", function () {

expect(typeof btoa).toBe("function");

expect(btoa.name).toBe("btoa");

expect(btoa.length).toBe(1);

});

it("encodes the empty string as the empty string", function () {

expect(btoa("")).toBe("");

});

it("encodes hello", function () {

expect(btoa("hello")).toBe("aGVsbG8=");

});

it("pads each input length as the base64 alphabet requires", function () {

var inputs = ["f", "fo", "foo", "foob", "fooba", "foobar"];

var encoded = inputs.map(function (input) {

return btoa(input);

});

expect(encoded).toEqual(["Zg==", "Zm8=", "Zm9v", "Zm9vYg==", "Zm9vYmE=", "Zm9vYmFy"]);

});

it("encodes code units across the whole byte range", function () {

expect(btoa("\u0000")).toBe("AA==");

expect(btoa("\u00FF")).toBe("/w==");

expect(btoa("\u0000\u0000\u0000")).toBe("AAAA");

expect(btoa("\u00FF\u00FF\u00FF")).toBe("////");

// Covers the two alphabet entries that are not alphanumeric.

expect(btoa("\u00FB\u00FF\u00BF")).toBe("+/+/");

});

it("coerces its argument to a string", function () {

expect(btoa(123)).toBe(btoa("123"));

expect(btoa(true)).toBe(btoa("true"));

expect(btoa(null)).toBe(btoa("null"));

});

it("throws InvalidCharacterError for a code unit above U+00FF", function () {

expectInvalidCharacter(function () {

btoa("\u0100");

});

expectInvalidCharacter(function () {

btoa("a\u20ACb");

});

expectInvalidCharacter(function () {

btoa("\uD83D\uDE00");

});

describe("atob", function () {

it("is a function on the global", function () {

expect(typeof atob).toBe("function");

expect(atob.name).toBe("atob");

expect(atob.length).toBe(1);

});

it("decodes the empty string as the empty string", function () {

expect(atob("")).toBe("");

});

it("decodes hello", function () {

expect(atob("aGVsbG8=")).toBe("hello");

});

it("decodes each padded length", function () {

var inputs = ["Zg==", "Zm8=", "Zm9v", "Zm9vYg==", "Zm9vYmE=", "Zm9vYmFy"];

var decoded = inputs.map(function (input) {

return atob(input);

});

expect(decoded).toEqual(["f", "fo", "foo", "foob", "fooba", "foobar"]);

});

it("returns one code unit per decoded byte", function () {

var high = atob("/w==");

expect(high.length).toBe(1);

expect(high.charCodeAt(0)).toBe(0xFF);

var zero = atob("AA==");

expect(zero.length).toBe(1);

expect(zero.charCodeAt(0)).toBe(0);

expect(atob("+/+/")).toBe("\u00FB\u00FF\u00BF");

});

it("ignores ASCII whitespace anywhere in the input", function () {

expect(atob("aGV s\tbG8=")).toBe("hello");

expect(atob(" aGVsbG8= ")).toBe("hello");

expect(atob("aGVs\nbG8\r=")).toBe("hello");

expect(atob("a\fGVsbG8=")).toBe("hello");

});

it("accepts input with the padding left off", function () {

expect(atob("aGVsbG8")).toBe("hello");

expect(atob("Zg")).toBe("f");

expect(atob("Zm8")).toBe("fo");

});

it("throws InvalidCharacterError when the length is one past a multiple of four", function () {

expectInvalidCharacter(function () {

atob("a");

});

expectInvalidCharacter(function () {

atob("aGVsb");

});

// Whitespace is removed before the length is checked, so this is the

// same one-past case rather than a whitespace rejection.

expectInvalidCharacter(function () {

atob(" a ");

});

it("throws InvalidCharacterError for a character outside the alphabet", function () {

expectInvalidCharacter(function () {

atob("a*bc");

});

expectInvalidCharacter(function () {

atob("a=bc");

});

expectInvalidCharacter(function () {

atob("aGV\u00E9bG8=");

});

// The base64url alphabet is not accepted.

expectInvalidCharacter(function () {

atob("-_-_");

});

describe("base64 round trips", function () {

it("round-trips text through btoa and back", function () {

var samples = ["", "a", "ab", "abc", "hello world", "\u0000\u0001\u0002", "\u00FF\u00FE\u00FD"];

var roundTripped = samples.map(function (sample) {

return atob(btoa(sample));

});

expect(roundTripped).toEqual(samples);

});

it("round-trips a binary string covering every byte value", function () {

var source = binaryString(everyByte());

var decoded = atob(btoa(source));

expect(decoded.length).toBe(256);

expect(decoded).toBe(source);

});

it("round-trips every input length across one four-byte group", function () {

var lengths = [1, 2, 3, 4, 5];

var roundTripped = lengths.map(function (length) {

var source = binaryString(everyByte().slice(0, length));

return atob(btoa(source)) === source;

});

expect(roundTripped).toEqual([true, true, true, true, true]);

});