FractionTask/tst_fractiontest.cpp

#include <QtTest>

#include <QDebug>

#include "fraction.hpp"

using namespace FractionNS;

class FractionTest : public QObject {
  Q_OBJECT

public:
  FractionTest();
  ~FractionTest();

private slots:
  void test_constructor();
  void test_display();
  void test_equivalence();
  void test_addition();
  void test_inequivalence();
  void test_substraction();
  void test_multiplication();
  void test_division();
};

FractionTest::FractionTest() {};
FractionTest::~FractionTest() {};

void FractionTest::test_constructor()
{
  // Normal fraction
  Fraction f1 = Fraction(1, 2);
  QCOMPARE(f1.getNumerator(), 1);
  QCOMPARE(f1.getDenominator(), 2);

  // Reducible fraction
  Fraction f2 = Fraction(2, 4);
  QCOMPARE(f2.getNumerator(), 1);
  QCOMPARE(f2.getDenominator(), 2);

  // Negative fractions
  Fraction f3 = Fraction(-1, 3);
  QCOMPARE(f3.getNumerator(), -1);
  QCOMPARE(f3.getDenominator(), 3);

  Fraction f4 = Fraction(1, -3);
  QCOMPARE(f4.getNumerator(), -1);
  QCOMPARE(f4.getDenominator(), 3);

  // Double negative (positive) fraction
  Fraction f5 = Fraction(-2, -3);
  QCOMPARE(f5.getNumerator(), 2);
  QCOMPARE(f5.getDenominator(), 3);
}

void FractionTest::test_display()
{
  // Normal fraction
  Fraction f1 = Fraction(1, 2);
  QCOMPARE(f1.display(), "1/2");
  Fraction f2 = Fraction(1, 3);
  QCOMPARE(f2.display(), "1/3");

  // Fractions that reduce
  Fraction f3 = Fraction(2, 4);
  QCOMPARE(f3.display(), "1/2");
  Fraction f4 = Fraction(982929, 123456);
  QCOMPARE(f4.display(), "327643/41152");

  // Negative Fractions
  Fraction f5 = Fraction(-5, 2);
  QCOMPARE(f5.display(), "-5/2");
}

void FractionTest::test_equivalence()
{
  Fraction f1 = Fraction(1, 1);
  Fraction f2 = Fraction(1, 1);
  Fraction f3 = Fraction(-1, 1);

  QCOMPARE(f1, f2);

  QCOMPARE(f1, 1);
  QCOMPARE(f1, 1.0);
  QCOMPARE(f1, 1.0f);

  QCOMPARE(f2, 1);
  QCOMPARE(f2, 1.0);
  QCOMPARE(f2, 1.0f);

  QCOMPARE(f3, -1);
  QCOMPARE(f3, -1.0);
  QCOMPARE(f3, -1.0f);

  Fraction f4 = Fraction(2, 3);
  Fraction f5 = Fraction(-2, 3);
  Fraction f6 = Fraction(2, -3);
  Fraction f7 = Fraction(-2, -3);

  QCOMPARE(f4, f7);
  QCOMPARE(f5, f6);

  QCOMPARE(f4, 2.0f / 3.0f);
  QCOMPARE(f4, 2.0 / 3.0);

  QCOMPARE(f7, 2.0f / 3.0f);
  QCOMPARE(f7, 2.0 / 3.0);

  QCOMPARE(f5, -2.0f / 3.0f);
  QCOMPARE(f5, -2.0 / 3.0);

  QCOMPARE(f6, -2.0f / 3.0f);
  QCOMPARE(f6, -2.0 / 3.0);
}

void FractionTest::test_inequivalence()
{
  Fraction f1 = Fraction(1, 1);
  Fraction f2 = Fraction(-1, 1);
  Fraction f3 = Fraction(2, 3);

  QVERIFY(f1 != f2);
  QVERIFY(f2 != f3);
  QVERIFY(f3 != f1);

  QVERIFY(f3 != 1);
  QVERIFY(f3 != 1.0);
  QVERIFY(f3 != 1.0f);
}

void FractionTest::test_addition()
{
  Fraction f1 = Fraction(1, 2);
  QCOMPARE(f1 + 1, 1.5f);
  QCOMPARE(f1, 0.5f);
  f1 += 1;
  QCOMPARE(f1, 1.5);

  Fraction f2 = Fraction(1, 2);
  QCOMPARE(f2 + 1, 1.5f);
  QCOMPARE(f2, 0.5f);

  Fraction f3 = Fraction(-2, 9);
  QCOMPARE(f3, -(2.0 / 9.0));
  QCOMPARE(f3, -(2.0f / 9.0f));
  f3 += Fraction(2, 9);
  QCOMPARE(f3, 0);
  QCOMPARE(f3, 0.0);
  QCOMPARE(f3, 0.0f);
}

void FractionTest::test_substraction()
{
  Fraction f1 = Fraction(11) - 10;
  QCOMPARE(f1, 1);

  Fraction f2 = Fraction(2, 3);
  QCOMPARE(f1 - f2, Fraction(1, 3));
  QCOMPARE(f2 - f1, Fraction(-1, 3));

  Fraction f3 = Fraction(8, 3);
  f3 -= Fraction(2, 3);
  QCOMPARE(f3, Fraction(6, 3));

  Fraction f4 = Fraction(9, 3);
  f4 -= 3;
  QCOMPARE(f4, 0);

  Fraction f5 = Fraction(8, 3);
  // (8/3) - ((2/3) - 1)
  //=(8/3) + (1/3)
  //= 9/3
  //= 3
  f5 -= Fraction(2, 3) - 1;
  QCOMPARE(f5, 3);

  Fraction f6 = Fraction(-2, 199);
  // (-2/199) + 8
  //=(-2/199) + (1592/199
  //=(1590/199)
  f6 -= Fraction(-4) - 4;
  QCOMPARE(f6, Fraction(1590, 199));
}

void FractionTest::test_multiplication()
{
  Fraction f1 = Fraction(1, 1);
  const Fraction f2 = Fraction(2, 1);
  QCOMPARE(f1 * 2, f2);
  f1 *= 2;
  QCOMPARE(f1, f2);

  f1 *= 3;
  QCOMPARE(f1, 6);

  QCOMPARE(f1 * Fraction(2, 3), 4);
}

void FractionTest::test_division() {
  Fraction f1 = Fraction(1, 1);
  const Fraction f2 = Fraction(1, 2);
  QCOMPARE(f1 / 2, f2);

  f1 /= 2;
  qDebug() << f1.display();
  QCOMPARE(f1, 0.5);
  QCOMPARE(f1 / 2, 0.25);

  QCOMPARE((f1 / 2) / Fraction(2, 3), Fraction(3, 8));
}

QTEST_APPLESS_MAIN(FractionTest)

#include "tst_fractiontest.moc"