Form1.button1_Click C# (CSharp) Method

    private void button1_Click(object sender, EventArgs e)
    {
        Close();
    }
}

        public void OsszeadasTest()
        {
            // arrange
            f1.textBox1.Text = "2";
            f1.textBox2.Text = "3";
            object    o  = new object();
            EventArgs ea = new EventArgs();

            // act
            f1.button1_Click(o, ea);

            // assert
            Assert.Equal("5", f1.label1.Text);
        }