Qt sending variables using signals & slots

[Akame.L]

Hello,
I want to send a message from a QLineEdit (lineEdit) after clicking a QPushButton (pushButton) from a window (test) and print it to a QLabel (label) in another window (test2).
This is what I've done so far:
test.h

#ifndef TEST_H
#define TEST_H
 
#include <QMainWindow>
#include "test2.h"
namespace Ui {
class test;
}
 
class test : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit test(QWidget *parent = 0);
    ~test();
signals:
    void notifyValueSent(const QString value);
private slots:
    void on_pushButton_clicked();
 
private:
    Ui::test *ui;
};
 
#endif // TEST_H

#ifndef TEST_H
#define TEST_H

#include <QMainWindow>
#include "test2.h"
namespace Ui {
class test;
}

class test : public QMainWindow
{
    Q_OBJECT

public:
    explicit test(QWidget *parent = 0);
    ~test();
signals:
    void notifyValueSent(const QString value);
private slots:
    void on_pushButton_clicked();

private:
    Ui::test *ui;
};

#endif // TEST_H

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test.cpp

#include "test.h"
#include "ui_test.h"
 
test::test(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::test)
{
    ui->setupUi(this);
 
}
 
test::~test()
{
    delete ui;
}
 
void test::on_pushButton_clicked()
{
    QString value = ui->lineEdit->text();
    emit notifyValueSent(value);
}

#include "test.h"
#include "ui_test.h"

test::test(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::test)
{
    ui->setupUi(this);

}

test::~test()
{
    delete ui;
}

void test::on_pushButton_clicked()
{
    QString value = ui->lineEdit->text();
    emit notifyValueSent(value);
}

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test2.h

#ifndef TEST2_H
#define TEST2_H
 
#include <QWidget>
#include "test.h"
namespace Ui {
class test2;
}
 
class test2 : public QWidget
{
    Q_OBJECT
 
public:
    explicit test2(QWidget *parent = 0);
    ~test2();
private slots:
    void onValueSent(const QString value);
private:
    Ui::test2 *ui;
};
 
#endif // TEST2_H

#ifndef TEST2_H
#define TEST2_H

#include <QWidget>
#include "test.h"
namespace Ui {
class test2;
}

class test2 : public QWidget
{
    Q_OBJECT

public:
    explicit test2(QWidget *parent = 0);
    ~test2();
private slots:
    void onValueSent(const QString value);
private:
    Ui::test2 *ui;
};

#endif // TEST2_H

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test2.cpp

#include "test2.h"
#include "test.h"
#include "ui_test2.h"
 
test2::test2(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::test2)
{
    ui->setupUi(this);
}
 
test2::~test2()
{
    delete ui;
}
void test2::onValueSent(QString value){
 
    ui->label->setText(value);
}

#include "test2.h"
#include "test.h"
#include "ui_test2.h"

test2::test2(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::test2)
{
    ui->setupUi(this);
}

test2::~test2()
{
    delete ui;
}
void test2::onValueSent(QString value){

    ui->label->setText(value);
}

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main.cpp

#include "test.h"
#include <QApplication>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    test t;
    test2 t2;
    QObject::connect(&t,SIGNAL(notifyValueSent(value)),&t2,SLOT(onValueSent(value)));
    t.show();
    return a.exec();
}

#include "test.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    test t;
    test2 t2;
    QObject::connect(&t,SIGNAL(notifyValueSent(value)),&t2,SLOT(onValueSent(value)));
    t.show();
    return a.exec();
}

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Thank you.