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import { assert, assertEquals, assertFalse } from "@std/assert";
import { describe, it } from "@std/testing/bdd";
import {
defined,
equal,
extremeBy,
get,
getCall,
identity,
instanciate,
pass,
} from "./anonymous.ts";
import { assertSpyCalls, spy } from "@std/testing/mock";
import { FALSE, TRUE } from "../../tests/fixtures/test_data.ts";
describe("identity", () => {
it("returns the same value", () => {
assertEquals(identity(42), 42);
assertEquals(identity("hello"), "hello");
const obj = { a: 1 };
assertEquals(identity(obj), obj);
});
});
describe("defined", () => {
it("returns true for non-null/undefined values", () => {
assert(defined(0));
assert(defined(""));
const FALSE = false;
assert(defined(FALSE));
});
it("returns false for null and undefined", () => {
assertFalse(defined(undefined));
assertFalse(defined(null));
});
});
describe("instanciate", () => {
class MyClass {
constructor(public value: number) {}
}
it("creates a new instance with the given argument", () => {
const create = instanciate(MyClass);
const instance = create(10);
assert(instance instanceof MyClass);
assertEquals(instance.value, 10);
});
});
describe("get", () => {
it("returns the value at the specified key", () => {
const obj = { a: 123, b: "hello" };
const getA = get("a");
const getB = get("b");
assertEquals(getA(obj), 123);
assertEquals(getB(obj), "hello");
});
});
describe("getCall", () => {
it("returns the return value at the specified key", () => {
const obj = { a: () => "a", b: (c: unknown) => c };
const getA = getCall("a");
const getB = getCall("b", "d");
assertEquals(getA(obj), "a");
assertEquals(getB(obj), "d");
});
});
describe("pass", () => {
it("calls the given function and returns the input", () => {
let a: number | null = null;
const f = spy((x: number) => a = x);
const result = pass(f)(5);
assertSpyCalls(f, 1);
assertEquals(f.calls[0].args[0], 5);
assertEquals(result, 5);
assertEquals(a, 5);
});
});
describe("equal", () => {
it("returns true when primitive values are strictly equal", () => {
const isFive = equal(5);
assert(isFive(5));
assertFalse(isFive(6));
const isHello = equal("hello");
assert(isHello("hello"));
assertFalse(isHello("world"));
});
it("returns true only for same object reference", () => {
const obj = { a: 1 };
const isObj = equal(obj);
assert(isObj(obj));
assertFalse(isObj({ a: 1 }));
});
it("handles boolean values correctly", () => {
const isTrue = equal(TRUE);
assert(isTrue(TRUE));
assertFalse(isTrue(FALSE));
});
});
describe("extremeBy", () => {
it("returns the maximum value from projected numbers", () => {
const data = [1, 3, 2];
const result = extremeBy(data, "max");
assertEquals(result, 3);
});
it("returns the minimum value from projected numbers", () => {
const data = [10, 4, 7];
const result = extremeBy(data, "min");
assertEquals(result, 4);
});
it("returns -Infinity/Infinity for empty array", () => {
const data: number[] = [];
assertEquals(extremeBy(data, "max"), -Infinity);
assertEquals(extremeBy(data, "min"), Infinity);
});
});
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