import { assertAlmostEquals, assertThrows } from "@std/assert";
import { reactionWeight, scoreForUser, totalScore } from "./scoring.ts";

Deno.test("one reaction by one user scores one point", () => {
  assertAlmostEquals(scoreForUser(1), 1);
});

Deno.test("repeat reactions by one user have diminishing weight", () => {
  assertAlmostEquals(reactionWeight(2), 1 / 3);
  assertAlmostEquals(scoreForUser(3), 1 + 1 / 3 + 1 / 5);
});

Deno.test("total score sums each user's score", () => {
  assertAlmostEquals(totalScore([1, 1, 2]), 3 + 1 / 3);
});

Deno.test("invalid reaction counts are rejected", () => {
  assertThrows(() => scoreForUser(0), RangeError);
});