import 'package:difference_of_squares/difference_of_squares.dart';
import 'package:test/test.dart';

final differenceOfSquares = DifferenceOfSquares();

void main() {
  group(
      'DifferenceOfSquares: Square the sum of the numbers up to the given number - ',
      squareTheSumOfTheNumbersUpToTheGivenNumber);
  group(
      'DifferenceOfSquares: Sum the squares of the numbers up to the given number - ',
      sumTheSquaresOfTheNumbersUpToTheGivenNumber);
  group('DifferenceOfSquares: Subtract sum of squares from square of sums - ',
      subtractSumOfSquaresFromSquareOfSums);
}

void squareTheSumOfTheNumbersUpToTheGivenNumber() {
  test('square of sum 1', () {
    final result = differenceOfSquares.squareOfSum(1);
    expect(result, equals(1));
  }, skip: false);

  test('square of sum 5', () {
    final result = differenceOfSquares.squareOfSum(5);
    expect(result, equals(225));
  }, skip: false);

  test('square of sum 100', () {
    final result = differenceOfSquares.squareOfSum(100);
    expect(result, equals(25502500));
  }, skip: false);
}

void sumTheSquaresOfTheNumbersUpToTheGivenNumber() {
  test('sum of squares 1', () {
    final result = differenceOfSquares.sumOfSquares(1);
    expect(result, equals(1));
  }, skip: false);

  test('sum of squares 5', () {
    final result = differenceOfSquares.sumOfSquares(5);
    expect(result, equals(55));
  }, skip: false);

  test('sum of squares 100', () {
    final result = differenceOfSquares.sumOfSquares(100);
    expect(result, equals(338350));
  }, skip: false);
}

void subtractSumOfSquaresFromSquareOfSums() {
  test('difference of squares 1', () {
    final result = differenceOfSquares.differenceOfSquares(1);
    expect(result, equals(0));
  }, skip: false);

  test('difference of squares 5', () {
    final result = differenceOfSquares.differenceOfSquares(5);
    expect(result, equals(170));
  }, skip: false);

  test('difference of squares 100', () {
    final result = differenceOfSquares.differenceOfSquares(100);
    expect(result, equals(25164150));
  }, skip: false);
}