Basic QtTest Lib Example

Article Metadata

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Tested with

Devices(s): Emulator / desktop / device

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Compatibility

Platform(s): All Qt Supported

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Article

Keywords: QtTest

Created: skumar_rao (26 Nov 2010)

Last edited: hamishwillee (11 Oct 2012)

Overview

This article shows how to convert string to it uppercase using Qt's QString. We'll start by writing a simple test to verify that the function QString::toupper correctly copy the string and convert it to uppercase.

Class Implementation

testqstring.cpp

#include <QtTest>
class TestQString: public QObject
{
	Q_OBJECT
private slots:
	void toUpper();
};
 
void TestQString::toUpper()
{
	QString str = "Hello";
	QCOMPARE(str.toUpper(), QString("HELLO"));
}
QTEST_MAIN(TestQString)

Note that

• The test class must inherit from QObject.
• The tests must be declared as "private slots", so that QtTest can automatically recognize and execute them.
• The macro QCOMPARE verifies that the two objects passed as arguments are identical and displays the value of these two objects, which facilitates debugging.
• QCOMPARE macro is quite strict, in way that the objects compared must be the same type. if you pass a argument as QString and another as constant then a compiler error will occur
• The macro QTEST_MAIN generates a main function that runs all the tests that have been reported via "private slots"

For compilation with qmake, just add the .pro for your project:

QT += testlib

more info can be found at http://doc.qt.nokia.com/latest/qtestlib-manual.html

--skumar_rao 17:50, 26 November 2010 (UTC)