gecko-dev/toolkit/modules/tests/xpcshell/test_CanonicalJSON.js

const { CanonicalJSON } = ChromeUtils.import("resource://gre/modules/CanonicalJSON.jsm");

function stringRepresentation(obj) {
  const clone = JSON.parse(JSON.stringify(obj));
  return JSON.stringify(clone);
}

add_task(async function test_canonicalJSON_should_preserve_array_order() {
  const input = ["one", "two", "three"];
  // No sorting should be done on arrays.
  Assert.equal(CanonicalJSON.stringify(input), '["one","two","three"]');
});

add_task(async function test_canonicalJSON_orders_object_keys() {
  const input = [{
    b: ["two", "three"],
    a: ["zero", "one"],
  }];
  Assert.equal(
    CanonicalJSON.stringify(input),
    '[{"a":["zero","one"],"b":["two","three"]}]'
  );
});

add_task(async function test_canonicalJSON_orders_nested_object_keys() {
  const input = [{
    b: {d: "d", c: "c"},
    a: {b: "b", a: "a"},
  }];
  Assert.equal(
    CanonicalJSON.stringify(input),
    '[{"a":{"a":"a","b":"b"},"b":{"c":"c","d":"d"}}]'
  );
});

add_task(async function test_canonicalJSON_escapes_unicode_values() {
  Assert.equal(
    CanonicalJSON.stringify([{key: "✓"}]),
    '[{"key":"\\u2713"}]'
  );
  // Unicode codepoints should be output in lowercase.
  Assert.equal(
    CanonicalJSON.stringify([{key: "é"}]),
    '[{"key":"\\u00e9"}]'
  );
});

add_task(async function test_canonicalJSON_escapes_unicode_object_keys() {
  Assert.equal(
    CanonicalJSON.stringify([{"é": "check"}]),
    '[{"\\u00e9":"check"}]'
  );
});


add_task(async function test_canonicalJSON_does_not_alter_input() {
  const records = [
    {"foo": "bar", "last_modified": "12345", "id": "1"},
    {"bar": "baz", "last_modified": "45678", "id": "2"},
  ];
  const serializedJSON = JSON.stringify(records);
  CanonicalJSON.stringify(records);
  Assert.equal(JSON.stringify(records), serializedJSON);
});


add_task(async function test_canonicalJSON_preserves_data() {
  const records = [
    {"foo": "bar", "last_modified": "12345", "id": "1"},
    {"bar": "baz", "last_modified": "45678", "id": "2"},
  ];
  const expected = '[{"foo":"bar","id":"1","last_modified":"12345"},' +
                   '{"bar":"baz","id":"2","last_modified":"45678"}]';
  Assert.equal(CanonicalJSON.stringify(records), expected);
});

add_task(async function test_canonicalJSON_does_not_add_space_separators() {
  const records = [
    {"foo": "bar", "last_modified": "12345", "id": "1"},
    {"bar": "baz", "last_modified": "45678", "id": "2"},
  ];
  const serialized = CanonicalJSON.stringify(records);
  Assert.ok(!serialized.includes(" "));
});

add_task(async function test_canonicalJSON_serializes_empty_object() {
  Assert.equal(CanonicalJSON.stringify({}), "{}");
});

add_task(async function test_canonicalJSON_serializes_empty_array() {
  Assert.equal(CanonicalJSON.stringify([]), "[]");
});

add_task(async function test_canonicalJSON_serializes_NaN() {
  Assert.equal(CanonicalJSON.stringify(NaN), "null");
});

add_task(async function test_canonicalJSON_serializes_inf() {
  // This isn't part of the JSON standard.
  Assert.equal(CanonicalJSON.stringify(Infinity), "null");
});


add_task(async function test_canonicalJSON_serializes_empty_string() {
  Assert.equal(CanonicalJSON.stringify(""), '""');
});

add_task(async function test_canonicalJSON_escapes_backslashes() {
  Assert.equal(CanonicalJSON.stringify("This\\and this"), '"This\\\\and this"');
});

add_task(async function test_canonicalJSON_handles_signed_zeros() {
  // do_check_eq doesn't support comparison of -0 and 0 properly.
  Assert.ok(CanonicalJSON.stringify(-0) === "-0");
  Assert.ok(CanonicalJSON.stringify(0) === "0");
});


add_task(async function test_canonicalJSON_with_deeply_nested_dicts() {
  const records = [{
    "a": {
      "b": "b",
      "a": "a",
      "c": {
        "b": "b",
        "a": "a",
        "c": ["b", "a", "c"],
        "d": {"b": "b", "a": "a"},
        "id": "1",
        "e": 1,
        "f": [2, 3, 1],
        "g": {2: 2, 3: 3, 1: {
          "b": "b", "a": "a", "c": "c"}}}},
    "id": "1"}];
  const expected =
    '[{"a":{"a":"a","b":"b","c":{"a":"a","b":"b","c":["b","a","c"],' +
    '"d":{"a":"a","b":"b"},"e":1,"f":[2,3,1],"g":{' +
    '"1":{"a":"a","b":"b","c":"c"},"2":2,"3":3},"id":"1"}},"id":"1"}]';

  Assert.equal(CanonicalJSON.stringify(records), expected);
});

add_task(async function test_canonicalJSON_should_use_scientific_notation() {
  /*
  We globally follow the Python float representation, except for exponents < 10
  where we drop the leading zero
  */
  Assert.equal(CanonicalJSON.stringify(.00099), "0.00099");
  Assert.equal(CanonicalJSON.stringify(.000011), "0.000011");
  Assert.equal(CanonicalJSON.stringify(.0000011), "0.0000011");
  Assert.equal(CanonicalJSON.stringify(.000001), "0.000001");
  Assert.equal(CanonicalJSON.stringify(.00000099), "9.9e-7");
  Assert.equal(CanonicalJSON.stringify(.0000001), "1e-7");
  Assert.equal(CanonicalJSON.stringify(.000000930258908), "9.30258908e-7");
  Assert.equal(CanonicalJSON.stringify(.00000000000068272), "6.8272e-13");
  Assert.equal(CanonicalJSON.stringify(Math.pow(10, 20)), "100000000000000000000");
  Assert.equal(CanonicalJSON.stringify(Math.pow(10, 21)), "1e+21");
  Assert.equal(CanonicalJSON.stringify(Math.pow(10, 15) + 0.1), "1000000000000000.1");
  Assert.equal(CanonicalJSON.stringify(Math.pow(10, 16) * 1.1), "11000000000000000");
});