Add unit test project.

This project depends on QFtp so it's only available for Qt4.

Author: sashoalm

QFtpServer.pro

@@ -5,3 +5,10 @@ SUBDIRS += QFtpServer \
 
 QFtpServer.depends = QFtpServerLib
 QFtpServerCommandLine.depends = QFtpServerLib
+
+equals(QT_MAJOR_VERSION, 4) {
+    SUBDIRS += QFtpServerTests
+    QFtpServerTests.depends = QFtpServerLib
+} else {
+    message(Unit tests project is available only for Qt4 because it depends on QFtp)
+}

QFtpServerTests/QFtpServerTests.pro

@@ -0,0 +1,40 @@
+#-------------------------------------------------
+#
+# Project created by QtCreator 2018-07-08T11:51:47
+#
+#-------------------------------------------------
+
+QT       += testlib network
+
+QT       -= gui
+
+TARGET = tst_qftpservertests
+CONFIG   += console
+CONFIG   -= app_bundle
+
+TEMPLATE = app
+
+# The following define makes your compiler emit warnings if you use
+# any feature of Qt which has been marked as deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if you use deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+
+SOURCES += \
+        tst_qftpservertests.cpp 
+
+DEFINES += SRCDIR=\\\"$$PWD/\\\"
+
+# Link to QFtpServerLib.
+win32:CONFIG(release, debug|release): LIBS += -L$$OUT_PWD/../QFtpServerLib/release/ -lQFtpServerLib
+else:win32:CONFIG(debug, debug|release): LIBS += -L$$OUT_PWD/../QFtpServerLib/debug/ -lQFtpServerLib
+else:unix: LIBS += -L$$OUT_PWD/../QFtpServerLib/ -lQFtpServerLib
+
+INCLUDEPATH += $$PWD/../QFtpServerLib
+DEPENDPATH += $$PWD/../QFtpServerLib

QFtpServerTests/tst_qftpservertests.cpp

@@ -0,0 +1,76 @@
+#include <QString>
+#include <QtTest>
+#include <ftpserver.h>
+#include <QFtp>
+
+class QFtpServerTests : public QObject
+{
+    Q_OBJECT
+
+public:
+    QFtpServerTests();
+
+private Q_SLOTS:
+    void testCaseMkd();
+};
+
+QFtpServerTests::QFtpServerTests()
+{
+}
+
+// Removes a folder and all its contents, recursively. We use this because
+// Qt4 lacks QDir::removeRecursively().
+// From https://stackoverflow.com/questions/27758573/deleting-a-folder-and-all-its-contents-with-qt/27758627
+bool removeRecursively(const QString & dirName)
+{
+    bool result = true;
+    QDir dir(dirName);
+
+    if (dir.exists(dirName)) {
+        Q_FOREACH(QFileInfo info, dir.entryInfoList(QDir::NoDotAndDotDot | QDir::System | QDir::Hidden  | QDir::AllDirs | QDir::Files, QDir::DirsFirst)) {
+            if (info.isDir()) {
+                result = removeRecursively(info.absoluteFilePath());
+            }
+            else {
+                result = QFile::remove(info.absoluteFilePath());
+            }
+
+            if (!result) {
+                return result;
+            }
+        }
+        result = dir.rmdir(dirName);
+    }
+    return result;
+}
+
+void QFtpServerTests::testCaseMkd()
+{
+    // Arrange
+    int port = 9421;
+    QString rootPath = "/tmp/ftpservertest/";
+    removeRecursively(rootPath);
+    QDir().mkpath(rootPath);
+    FtpServer server(this, rootPath, port);
+    Q_UNUSED(server);
+
+    // Act
+    QFtp client;
+    client.connectToHost("localhost", port);
+    client.login();
+    client.mkdir("foo");
+
+    // Wait for the server to finish its work. The
+    // ftp client emits a "done()" signal when the
+    // last pending command has finished.
+    QEventLoop loop;
+    connect(&client, SIGNAL(done(bool)), &loop, SLOT(quit()));
+    loop.exec();
+
+    // Assert
+    QVERIFY(QDir(rootPath + "/foo").exists());
+}
+
+QTEST_MAIN(QFtpServerTests)
+
+#include "tst_qftpservertests.moc"