WinForms+EventApprovals

DemoForm.cs

using System;
using System.Windows.Forms;

namespace ApprovalUtilities.Tests.Reflection
{
    public partial class DemoForm : Form
    {
        private System.Windows.Forms.Button button1;

        private System.Windows.Forms.CheckBox checkBox1;

        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        private System.Windows.Forms.ListBox listBox1;

        private System.Windows.Forms.Timer timer1;

        public DemoForm()
        {
            InitializeComponent();
        }

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

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

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
        }

        private void DemoForm_Load(object sender, EventArgs e)
        {
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            this.button1 = new System.Windows.Forms.Button();
            this.checkBox1 = new System.Windows.Forms.CheckBox();
            this.listBox1 = new System.Windows.Forms.ListBox();
            this.timer1 = new System.Windows.Forms.Timer(this.components);
            this.SuspendLayout();
            //
            // button1
            //
            this.button1.Location = new System.Drawing.Point(13, 13);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 23);
            this.button1.TabIndex = 0;
            this.button1.Text = "button1";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            //
            // checkBox1
            //
            this.checkBox1.AutoSize = true;
            this.checkBox1.Location = new System.Drawing.Point(192, 13);
            this.checkBox1.Name = "checkBox1";
            this.checkBox1.Size = new System.Drawing.Size(80, 17);
            this.checkBox1.TabIndex = 1;
            this.checkBox1.Text = "checkBox1";
            this.checkBox1.UseVisualStyleBackColor = true;
            this.checkBox1.CheckedChanged += new System.EventHandler(this.checkBox1_CheckedChanged);
            //
            // listBox1
            //
            this.listBox1.FormattingEnabled = true;
            this.listBox1.Location = new System.Drawing.Point(13, 43);
            this.listBox1.Name = "listBox1";
            this.listBox1.Size = new System.Drawing.Size(259, 212);
            this.listBox1.TabIndex = 2;
            //
            // timer1
            //
            this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
            //
            // DemoForm
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(284, 262);
            this.Controls.Add(this.listBox1);
            this.Controls.Add(this.checkBox1);
            this.Controls.Add(this.button1);
            this.Name = "DemoForm";
            this.Text = "DemoForm";
            this.Load += new System.EventHandler(this.DemoForm_Load);
            this.ResumeLayout(false);
            this.PerformLayout();
        }

        #endregion Windows Form Designer generated code
    }
}

ExampleTest.cs

namespace ApprovalUtilities.Tests.Reflection
{
    using System.Collections.Generic;
    using System.Linq;
    using System.Reflection;
    using ApprovalTests;
    using ApprovalUtilities.Reflection;
    using ApprovalUtilities.Utilities;
    using Microsoft.VisualStudio.TestTools.UnitTesting;

    [TestClass]
    public class ExampleTest
    {
        [TestMethod]
        [ApprovalTests.Reporters.UseReporter(typeof(ApprovalTests.Reporters.TortoiseDiffReporter))]
        public void GetNonPublicFieldsAndSelf()
        {
            var testingForm = new DemoForm();

            // Get all the non public instance FieldInfos
            IEnumerable<FieldInfo> fieldInfos =
                testingForm.NonPublicInstanceFields();

            // Get the field values with their names, discard nulls, add the form
            var objectDescriptors = fieldInfos
                .Select(fi => new { fi.Name, Value = fi.GetValue(testingForm) })
                .Concat(new[] { new { testingForm.Name, Value = (object)testingForm } })
                .Where(fd => fd.Value != null);

            // Associate fields with CallbackDescriptor collections, discard those
            // without handlers
            var objectsWithEvents = objectDescriptors
                .Select(od => new { od.Name, Handlers = od.Value.GetPocoEvents().Concat(od.Value.GetEventHandlerListEvents()) })
                .Where(od => od.Handlers.Any());

            Approvals.VerifyAll(
                objectsWithEvents,
                item => item.Name + " => " + item.Handlers.ToReadableString());
        }
    }
}