Is it possible to set data for testing in separate method in qt unit testing?

Question

I saw that Qt supports a data function associated to a test function.

http://qt-project.org/doc/qt-4.8/qtestlib-tutorial2.html

Is it possible to have some similar type of data function for multiple tests ?

Example:

void Test::Test1()
{
  SomeClass::SomeDataType a;
  a.manyValuesComplicatedToSet = 1;
  SomeOtherClass::SomeOtherDataType b;
  b.manyValuesComplicatedToSet = 2;

  QVERIFY(SomeTestClass::someFunction(a,b)== 3);
}

void Test::Test2()
{
  SomeClass::SomeDataType a;
  a.manyValuesComplicatedToSet = 1;
  SomeOtherClass::SomeOtherDataType b;
  b.manyValuesComplicatedToSet = 2;

  QVERIFY(SomeTestClass::someOtherFunction(a,b)== 5);
}

I would love to be able to set the data above in a common data function, so that I would not type it all every time.

Is that possible ?

Answer 1

It's possible by extracting your test data into a separate function and then calling that function from your _data functions:

void Test::Test1()
{
    QFETCH(SomeClass::SomeDataType, a);
    QFETCH(SomeOtherClass::SomeOtherDataType, b);

    QCOMARE(SomeTestClass::someFunction(a,b), 3);
}

void Test::Test1_data()
{
    createTestData();
}

void Test::Test2()
{
    QFETCH(SomeClass::SomeDataType, a);
    QFETCH(SomeOtherClass::SomeOtherDataType, b);

    QCOMPARE(SomeTestClass::someOtherFunction(a,b), 5);
}

void Test::Test2_data()
{
    createTestData();
}

void Test::createTestData()
{
    QTest::addColumn<SomeClass::SomeDataType>("a");
    QTest::addColumn<SomeOtherClass::SomeOtherDataType>("b");

    SomeClass::SomeDataType a;
    a.manyValuesComplicatedToSet = 1;
    SomeOtherClass::SomeOtherDataType b;
    b.manyValuesComplicatedToSet = 2;
    QTest::newRow("test 1") << a << b;
}

Note that createTestData() in my example above is not defined as a slot. Also note that to pass SomeClass::SomeDataType and SomeOtherClass::SomeOtherDataType as test data parameters, you must call Q_DECLARE_METATYPE on them.