c++ TDD quest

[bbguimaraes]

cxxtest

Code

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#include <cxxtest/TestSuite.h>
using CxxTest::TestSuite;

int sum(int n1, int n2) {
    return 3;
}

class Test : public CxxTest::TestSuite {
    public:
        void test1plus2() {
            TS_ASSERT_EQUALS(sum(1, 2), 3);
        }

        void test2plus2() {
            TS_ASSERT_EQUALS(sum(2, 2), 4);
        }
};

Output

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Running 2 tests.
In Test::test2plus2:
Test.h:15: Error: Expected (sum(2, 2) == 4), found (3 != 4)
Failed 1 of 2 tests
Success rate: 50%

[bbguimaraes]

The last fundamental element we need to test before starting some useful testing is fixtures. They allow tests to share data, making it much easier to write many tests that depend on the same set of values. Some important things to look for is the ability to create objects on the stack, the ability to assign specific fixtures to specific tests and the amount of overhead required, both in code and on execution.

Index:

• boost::test
• QtTest
• googletest
• cxxtest

[bbguimaraes]

boost::test

Code

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#define BOOST_TEST_MODULE Test
#include <boost/test/unit_test.hpp>

struct SumFixture {
    SumFixture() :
        N(5),
        VALUES_1{ 0, 2, 4,  6,  8 },
        VALUES_2{ 1, 3, 5,  7,  9 },
        RESULTS{ 1, 5, 9, 13, 17 }
    {}

    const unsigned int N;
    const int VALUES_1[5];
    const int VALUES_2[5];
    const int RESULTS[5];
};

int sum(int n1, int n2) {
    return n1 + n2;
}

BOOST_FIXTURE_TEST_CASE(TestSum, SumFixture) {
    for(unsigned int i = 0; i < N; ++i)
        BOOST_CHECK_EQUAL(sum(VALUES_1[i], VALUES_2[i]), RESULTS[i]);
}

[bbguimaraes]

QtTest

Code

Code: Select all

#include <QtTest/QtTest>

int sum(int n1, int n2) {
    return n1 + n2;
}

class TestSum : public QObject {
    Q_OBJECT

    private slots:
        void testSum_data() {
            QTest::addColumn<int>("value1");
            QTest::addColumn<int>("value2");
            QTest::addColumn<int>("result");

            QTest::newRow("0") << 0 << 1 << 1;
            QTest::newRow("1") << 2 << 3 << 5;
            QTest::newRow("2") << 4 << 5 << 9;
            QTest::newRow("3") << 6 << 7 << 13;
            QTest::newRow("4") << 8 << 9 << 17;
        }

        void testSum() {
            QFETCH(int, value1);
            QFETCH(int, value2);
            QFETCH(int, result);

            QCOMPARE(sum(value1, value2), result);
        }
};

QTEST_MAIN(TestSum)
#include <main.moc>

[bbguimaraes]

googletest

Code

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#include <gtest/gtest.h>

class SumFixture : public testing::Test {
    public:
        SumFixture() :
            N(5),
            VALUES_1{0, 2, 4, 6, 8},
            VALUES_2{1, 3, 5, 7, 9},
            RESULTS{1, 5, 9, 13, 17}
        {}

    protected:
        const unsigned int N;
        const int VALUES_1[5];
        const int VALUES_2[5];
        const int RESULTS[5];
};

int sum(int n1, int n2) {
    return n1 + n2;
}

TEST_F(SumFixture, TestSum) {
    for(unsigned int i = 0; i < N; ++i)
        ASSERT_EQ(RESULTS[i], sum(VALUES_1[i], VALUES_2[i]));
}