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import assert from "node:assert/strict";
import * as runner from "../runner.mjs";
import {
keys,
difference,
assocIn,
getIn,
first,
partial,
strSortFn,
undefinedAsNull,
} from "../../src/utils.mjs";
const test_keys = t => {
t.start("keys()");
t.test("happy paths", () => {
assert.deepEqual(
{ a: 1, b: 2 },
keys(["a", "b"], { a: 1, b: 2, c: 3 }),
);
});
t.test("stress scenarios", () => {
assert.deepEqual(
{},
keys([], {}),
"empty selection of empty object",
);
assert.deepEqual(
{},
keys([], {a: 1}),
"empty selection of non-empty object",
);
assert.deepEqual(
{},
keys(["a"], {}),
"non-empty selection of empty object",
);
assert.deepEqual(
{ a: undefined, b: null },
keys(["a", "b", "c"], { a: undefined, b: null }),
"falsy values",
);
});
};
const test_difference = t => {
t.start("difference()");
t.test("empty values", () => {
assert.deepEqual(
difference(new Set(), new Set()),
new Set(),
);
assert.deepEqual(
difference(new Set(), new Set([1, 2])),
new Set(),
);
assert.deepEqual(
difference(new Set([1, 2]), new Set()),
new Set([1, 2]),
);
});
t.test("different subsets", () => {
assert.deepEqual(
difference(new Set([1, 2]), new Set([3, 4])),
new Set([1, 2]),
);
assert.deepEqual(
difference(new Set([1, 2, 3]), new Set([2, 4, 5])),
new Set([1, 3]),
);
assert.deepEqual(
difference(new Set([1]), new Set([1, 2, 3, 4, 5])),
new Set(),
);
assert.deepEqual(
difference(new Set([1, 2, 3]), new Set([1, 2, 3])),
new Set(),
);
});
};
const test_assocIn = t => {
t.start("assocIn()");
t.test("empty values", () => {
assert.deepEqual(assocIn({}, [], null), {});
assert.deepEqual(assocIn({ k: "v" }, [], null), { k: "v" });
});
t.test("adding values", () => {
assert.deepEqual(assocIn({}, ["k"], "v"), { k: "v" });
assert.deepEqual(assocIn({}, ["k1", "k2"], "v"), { k1: { k2: "v" }});
assert.deepEqual(assocIn({}, ["k1", "k2", "k3"], "v"), { k1: { k2: { k3: "v" }}});
assert.deepEqual(assocIn({ k: "v" }, ["k1", "k2"], "v"), { k: "v", k1: { k2: "v" }});
});
t.test("replacing values", () => {
assert.deepEqual(
assocIn(
{ k1: { k2: { k3: "before" }}},
["k1", "k2", "k3"],
"after"
),
{ k1: { k2: { k3: "after" }}}
);
});
};
const test_getIn = t => {
t.start("getIn()");
t.test("empty values", () => {
assert.deepEqual(getIn({}, []), {});
assert.deepEqual(getIn({ k: "v" }, []), { k: "v" });
});
t.test("missing values", () => {
assert.deepEqual(getIn({}, ["a", "b", "c"]), undefined);
assert.deepEqual(getIn({ a: {}}, ["a", "b", "c"]), undefined);
assert.deepEqual(getIn({ a: { b: {}}}, ["a", "b", "c"]), undefined);
assert.deepEqual(getIn({ a: { b: {}, c: {}}}, ["a", "b", "c"]), undefined);
});
t.test("nested valeues", () => {
assert.deepEqual(getIn({ a: { b: { c: { d: "e" }}}}, ["a", "b", "c", "d"]), "e");
});
};
const test_first = t => {
t.start("first()");
t.test("empty values", () => {
assert.equal(first([], () => {}), null);
});
t.test("when function doesn't transform, it behaves similarly to [].find()", () => {
const arr1 = [ 0, null, undefined, "", 1, 2 ];
assert.equal(first(arr1, x => x), 1);
assert.equal(arr1.find(x => x), 1);
const arr2 = [ 0, null, undefined, "", false ];
assert.equal(first(arr2, x => x), null);
assert.equal(arr2.find(x => x), undefined);
});
t.test("when it does transform, we return the transformed value", () => {
const arr = [ 1, 3, 5, 6 ];
assert.equal(
first(arr, x => x % 2 === 0 && "a brand new value"),
"a brand new value",
);
});
};
const test_partial = t => {
t.start("partial()");
t.test("empty values", () => {
const adder = (a, b, c) => a + b + c;
const adder1 = partial(adder);
assert.equal(adder1(1, 2, 3), 6);
const adder2 = partial(adder, 4, 5, 6);
assert.equal(adder2(), 15);
const noargs = () => "static";
assert.equal(partial(noargs)(), noargs());
});
t.test("too few arguments", () => {
const threeArgs = (a, b, c) => {
assert.notEqual(c, undefined);
return a + b + c
};
const add1 = partial(threeArgs, 1);
assert.throws(
() => add1(2),
assert.AssertionError,
);
const add1And2 = partial(threeArgs, 1, 2);
assert.throws(
() => add1And2(),
assert.AssertionError,
);
const addNothing = partial(threeArgs);
assert.throws(
() => addNothing(),
assert.AssertionError,
);
});
t.test("too many arguments", () => {
const twoArgs = (a, b) => a + b;
assert.equal(partial(twoArgs, 1)(2, 3), 3);
assert.equal(partial(twoArgs, 1, 2)(3), 3);
});
t.test("daily usage", () => {
const twoArg = (a, b) => a + b;
const numbers = [ 1, 2, 3, 4, 5 ];
assert.deepEqual(
numbers.map(partial(twoArg, 2)),
[ 3, 4, 5, 6, 7 ],
);
});
t.test("nested partials", () => {
const threeArgs = (a, b, c) => a + b + c;
const add1 = partial(threeArgs, 1);
const add1And2 = partial(add1, 2);
assert.equal(add1And2(3), 6);
});
};
const test_strSortFn = t => {
t.start("strSortFn()");
t.test("empty value", () => {
assert.equal(strSortFn("", ""), 0);
});
t.test("default sort", () => {
const arr = [ "a", "Z" ];
assert.deepEqual(
[...arr].sort(strSortFn),
[...arr].sort().reverse(),
);
});
};
const test_undefinedAsNull = t => {
t.start("undefinedAsNull()");
t.test("null for undefined or null", () => {
assert.equal(undefinedAsNull(undefined), null);
assert.equal(undefinedAsNull(null), null);
});
t.test("identity otherwise", () => {
const expected = [
" ", "", 0, 1, -1.1, true, false,
[], [ "" ], {}, { k: "v" },
];
const given = expected.map(undefinedAsNull);
assert.deepEqual(given, expected);
});
};
await runner.runTests([
test_keys,
test_difference,
test_assocIn,
test_getIn,
test_first,
test_partial,
test_strSortFn,
test_undefinedAsNull,
]);
|
