// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.CodeDom;

namespace System.ComponentModel.Design.Serialization.Tests;

public class ExpressionContextTests
{
    public static IEnumerable<object[]> Ctor_CodeExpression_Type_Object_Object_TestData()
    {
        yield return new object[] { new CodeExpression(), typeof(int), new(), new() };
        yield return new object[] { new CodeExpression(), typeof(int), new(), null };
    }

    [Theory]
    [MemberData(nameof(Ctor_CodeExpression_Type_Object_Object_TestData))]
    public void ExpressionContext_Ctor_CodeExpression_Type_Object_Object_TestData(CodeExpression expression, Type expressionType, object owner, object presetValue)
    {
        ExpressionContext context = new(expression, expressionType, owner, presetValue);
        Assert.Same(expression, context.Expression);
        Assert.Same(expressionType, context.ExpressionType);
        Assert.Same(owner, context.Owner);
        Assert.Same(presetValue, context.PresetValue);
    }

    public static IEnumerable<object[]> Ctor_CodeExpression_Type_Object_TestData()
    {
        yield return new object[] { new CodeExpression(), typeof(int), new() };
    }

    [Theory]
    [MemberData(nameof(Ctor_CodeExpression_Type_Object_TestData))]
    public void ExpressionContext_Ctor_CodeExpression_Type_Object_TestData(CodeExpression expression, Type expressionType, object owner)
    {
        ExpressionContext context = new(expression, expressionType, owner);
        Assert.Same(expression, context.Expression);
        Assert.Same(expressionType, context.ExpressionType);
        Assert.Same(owner, context.Owner);
        Assert.Null(context.PresetValue);
    }

    [Fact]
    public void ExpressionContext_Ctor_NullExpression_ThrowsArgumentNullException()
    {
        Assert.Throws<ArgumentNullException>("expression", () => new ExpressionContext(null, typeof(int), new object(), new object()));
    }

    [Fact]
    public void RootContext_Ctor_NullExpressionType_ThrowsArgumentNullException()
    {
        Assert.Throws<ArgumentNullException>("expressionType", () => new ExpressionContext(new CodeExpression(), null, new object(), new object()));
    }

    [Fact]
    public void RootContext_Ctor_NullOwner_ThrowsArgumentNullException()
    {
        Assert.Throws<ArgumentNullException>("owner", () => new ExpressionContext(new CodeExpression(), typeof(int), null, new object()));
    }
}
