util.test.ts

import {
  assertEquals,
  assertThrows,
} from "https://deno.land/std/testing/asserts.ts";
import {
  bigIntAbs,
  countTrailingZeros,
  extractExp,
  getDecimals,
} from "./util.ts";

Deno.test("getDecimals() with string input", () => {
  assertEquals(getDecimals("0.52135"), 5);
  assertEquals(getDecimals("0.521135"), 6);
  assertEquals(getDecimals("9846515.521135"), 6);
  assertEquals(getDecimals("9846515.52113500"), 8);
  assertEquals(getDecimals("9846515.0"), 1);
  assertEquals(getDecimals("9846515"), 0);
  assertEquals(getDecimals("22e6"), 0);
  assertThrows(() => getDecimals("woiejoif23423"), Error, "InvalidNumber");
  assertThrows(() => getDecimals("2.5.626"), Error, "InvalidNumber");
  assertThrows(() => getDecimals("25e6e9"), Error, "InvalidNumber");
});

Deno.test("getDecimals() with number input", () => {
  assertEquals(getDecimals(0.52135), 5);
  assertEquals(getDecimals(0.521135), 6);
  assertEquals(getDecimals(9846515.521135), 6);
  assertEquals(getDecimals(9846515.52113500), 6);
  assertEquals(getDecimals(9846515.521135006), 9);
  assertEquals(getDecimals(9846515), 0);
});

Deno.test("extractExp()", () => {
  assertEquals(extractExp("23"), ["23", 0]);
  assertEquals(extractExp("23.5"), ["23.5", 0]);
  assertEquals(extractExp("23e5"), ["23", 5]);
  assertEquals(extractExp("23.6e5"), ["23.6", 5]);
  assertThrows(() => extractExp("23.6e2e5"), Error, "InvalidNumber");
});

Deno.test("countTrailingZeros()", () => {
  assertEquals(countTrailingZeros(0n, 100), 0);
  assertEquals(countTrailingZeros(5213522323n, 100), 0);
  assertEquals(countTrailingZeros(52113500000n, 100), 5);
  assertEquals(countTrailingZeros(-9846515000000000000000n, 100), 15);
  assertEquals(countTrailingZeros(-9846515000000000000000n, 10), 10);
});

Deno.test("bigIntAbs()", () => {
  assertEquals(bigIntAbs(0n), 0n);
  assertEquals(bigIntAbs(-0n), 0n);
  assertEquals(bigIntAbs(698465465n), 698465465n);
  assertEquals(bigIntAbs(-98498465n), 98498465n);
});