import { describe, expect, it } from "vitest";
import { reservedRows } from "$lib/components/repo/fileDiff";

describe("reservedRows", () => {
	const file = (lines: number, insertions: number, deletions: number) => ({
		lines,
		stat: { insertions, deletions }
	});

	it("takes gitmirror's pair count as the split row count", () => {
		expect(reservedRows(file(40, 10, 6), true)).toBe(40);
	});

	it("adds the replaced lines back for unified rows", () => {
		expect(reservedRows(file(40, 10, 6), false)).toBe(46);
	});

	it("counts a pure addition the same either way", () => {
		expect(reservedRows(file(21, 21, 0), false)).toBe(21);
		expect(reservedRows(file(21, 21, 0), true)).toBe(21);
	});

	it("falls back to the stat sum when the line count is unknown", () => {
		expect(reservedRows({ stat: { insertions: 10, deletions: 6 } }, true)).toBe(16);
		expect(reservedRows({ stat: { insertions: 10, deletions: 6 } }, false)).toBe(22);
	});
});