// noinspection JSMismatchedCollectionQueryUpdate

import "@reapptor/ts-linq";

describe("first", () => {

test("number", () => {

const result: number = [0].first();

expect(result).toEqual(0);

});

test("number-predicate", () => {

const input: number[] = [0, 0];

const result: number | null = input.first(item => item == 0);

expect(result).toEqual(0);

});

test("number-predicate-default", () => {

const input: number[] = [0];

const result: number | null = input.first(item => item == 1, 100);

expect(result).toEqual(100);

});

test("empty-default", () => {

const input: number[] = [];

const result: number | null = input.first(item => item == 1, 100);

expect(result).toEqual(100);

});

test("empty-error", () => {

const input: number[] = [];

try {

input.first();

} catch (e: any) {

expect(e).toBeInstanceOf(Error);

expect(e.message).toBe(`The source sequence is empty.`);

}

});

test("number-predicate-not-found", () => {

const input: number[] = [0];

try {

input.first(item => item == 1);

} catch (e: any) {

expect(e).toBeInstanceOf(Error);

expect(e.message).toBe(`No item found matching the specified predicate.`);

}

});

});