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Reinis MartinsonsandGitHub
49d6a64a98
* implement rounding utils Signed-off-by: Reinis Martinsons <[email protected]> * allow passing custom rounding mode to rounding utils Signed-off-by: Reinis Martinsons <[email protected]>
79 lines
3.8 KiB
JavaScript
79 lines
3.8 KiB
JavaScript
// Script to test
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const RoundingUtils = require("../dist/RoundingUtils");
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const BigNumber = require("bignumber.js");
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const Web3 = require("web3");
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const { assert } = require("chai");
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const { roundToDecimal } = RoundingUtils;
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const { toBN, toWei } = Web3.utils;
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describe("RoundingUtils.js", function () {
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describe("roundToDecimal", function () {
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it("rounds down if next decimal < 5 for positive number", function () {
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const rawAmount = toBN(toWei("1.123"));
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const inputDecimals = 18;
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const roundingPrecision = 2;
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const expectedRoundedAmount = toBN(toWei("1.12"));
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const roundedAmount = roundToDecimal(rawAmount, inputDecimals, roundingPrecision);
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assert.equal(roundedAmount.toString(), expectedRoundedAmount.toString());
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});
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it("rounds up if next decimal >= 5 for positive number", function () {
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const rawAmount = toBN(toWei("1.125"));
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const inputDecimals = 18;
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const roundingPrecision = 2;
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const expectedRoundedAmount = toBN(toWei("1.13"));
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const roundedAmount = roundToDecimal(rawAmount, inputDecimals, roundingPrecision);
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assert.equal(roundedAmount.toString(), expectedRoundedAmount.toString());
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});
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it("rounds towards 0 if next decimal < 5 for negative number", function () {
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const rawAmount = toBN(toWei("-1.123"));
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const inputDecimals = 18;
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const roundingPrecision = 2;
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const expectedRoundedAmount = toBN(toWei("-1.12"));
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const roundedAmount = roundToDecimal(rawAmount, inputDecimals, roundingPrecision);
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assert.equal(roundedAmount.toString(), expectedRoundedAmount.toString());
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});
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it("rounds away from 0 if next decimal >= 5 for negative number", function () {
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const rawAmount = toBN(toWei("-1.125"));
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const inputDecimals = 18;
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const roundingPrecision = 2;
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const expectedRoundedAmount = toBN(toWei("-1.13"));
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const roundedAmount = roundToDecimal(rawAmount, inputDecimals, roundingPrecision);
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assert.equal(roundedAmount.toString(), expectedRoundedAmount.toString());
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});
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it("rounds down to nearest million if below 500k threshold", function () {
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const rawAmount = toBN(toWei("1499999"));
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const inputDecimals = 18;
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const roundingPrecision = -6;
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const expectedRoundedAmount = toBN(toWei("1000000"));
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const roundedAmount = roundToDecimal(rawAmount, inputDecimals, roundingPrecision);
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assert.equal(roundedAmount.toString(), expectedRoundedAmount.toString());
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});
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it("rounds up to nearest million starting from next 500k threshold", function () {
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const rawAmount = toBN(toWei("1500000"));
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const inputDecimals = 18;
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const roundingPrecision = -6;
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const expectedRoundedAmount = toBN(toWei("2000000"));
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const roundedAmount = roundToDecimal(rawAmount, inputDecimals, roundingPrecision);
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assert.equal(roundedAmount.toString(), expectedRoundedAmount.toString());
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});
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it("check if rounding works for non-scaled decimals", function () {
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const rawAmount = toBN("1500000");
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const inputDecimals = 0;
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const roundingPrecision = -6;
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const expectedRoundedAmount = toBN("2000000");
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const roundedAmount = roundToDecimal(rawAmount, inputDecimals, roundingPrecision);
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assert.equal(roundedAmount.toString(), expectedRoundedAmount.toString());
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});
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it("check floor rounding for positive number where next decimal >= 5", function () {
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const rawAmount = toBN(toWei("1.125"));
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const inputDecimals = 18;
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const roundingPrecision = 2;
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const roundingMode = BigNumber.ROUND_FLOOR;
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const expectedRoundedAmount = toBN(toWei("1.12"));
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const roundedAmount = roundToDecimal(rawAmount, inputDecimals, roundingPrecision, roundingMode);
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assert.equal(roundedAmount.toString(), expectedRoundedAmount.toString());
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});
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});
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});
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