runtime/src/libraries/System.CodeDom/tests/System/CodeDom/CodeObjectCreateExpressionTests.cs at master · mathalro/runtime · GitHub

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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System.Collections.Generic;
using System.Linq;
using Xunit;

namespace System.CodeDom.Tests
{
    public class CodeObjectCreateExpressionTests : CodeObjectTestBase<CodeObjectCreateExpression>
    {
        [Fact]
        public void Ctor_Default()
        {
            var objectCreate = new CodeObjectCreateExpression();
            Assert.Equal(typeof(void).FullName, objectCreate.CreateType.BaseType);
            Assert.Empty(objectCreate.Parameters);
        }

        public static IEnumerable<object[]> Ctor_CodeTypeReference_ParamsCodeExpression_TestData()
        {
            yield return new object[] { null, new CodeExpression[0] };
            yield return new object[] { new CodeTypeReference(), new CodeExpression[] { new CodePrimitiveExpression() } };
            yield return new object[] { new CodeTypeReference(typeof(int)), new CodeExpression[] { new CodePrimitiveExpression("Value") } };
        }

        [Theory]
        [MemberData(nameof(Ctor_CodeTypeReference_ParamsCodeExpression_TestData))]
        public void Ctor(CodeTypeReference type, CodeExpression[] parameters)
        {
            var objectCreate = new CodeObjectCreateExpression(type, parameters);
            Assert.Equal((type ?? new CodeTypeReference("")).BaseType, objectCreate.CreateType.BaseType);
            Assert.Equal(parameters, objectCreate.Parameters.Cast<CodeExpression>());
        }

        public static IEnumerable<object[]> Ctor_String_ParamsCodeExpression_TestData()
        {
            yield return new object[] { null, new CodeExpression[0], "System.Void" };
            yield return new object[] { "", new CodeExpression[] { new CodePrimitiveExpression() }, "System.Void" };
            yield return new object[] { "Int32", new CodeExpression[] { new CodePrimitiveExpression("Value") }, "Int32" };
        }

        [Theory]
        [MemberData(nameof(Ctor_String_ParamsCodeExpression_TestData))]
        public void Ctor(string type, CodeExpression[] parameters, string expectedBaseType)
        {
            var objectCreate = new CodeObjectCreateExpression(type, parameters);
            Assert.Equal(expectedBaseType, objectCreate.CreateType.BaseType);
            Assert.Equal(parameters, objectCreate.Parameters.Cast<CodeExpression>());
        }

        public static IEnumerable<object[]> Ctor_Type_ParamsCodeExpression_TestData()
        {
            yield return new object[] { typeof(int), new CodeExpression[0], "System.Int32" };
            yield return new object[] { typeof(List<>), new CodeExpression[] { new CodePrimitiveExpression() }, "System.Collections.Generic.List`1" };
            yield return new object[] { typeof(void), new CodeExpression[] { new CodePrimitiveExpression("Value") }, "System.Void" };
        }

        [Theory]
        [MemberData(nameof(Ctor_Type_ParamsCodeExpression_TestData))]
        public void Ctor_Type_String(Type type, CodeExpression[] parameters, string expectedBaseType)
        {
            var objectCreate = new CodeObjectCreateExpression(type, parameters);
            Assert.Equal(expectedBaseType, objectCreate.CreateType.BaseType);
            Assert.Equal(parameters, objectCreate.Parameters.Cast<CodeExpression>());
        }

        [Fact]
        public void Ctor_NullParameters_ThrowsArgumentNullException()
        {
            AssertExtensions.Throws<ArgumentNullException>("value", () => new CodeObjectCreateExpression(new CodeTypeReference(), null));
            AssertExtensions.Throws<ArgumentNullException>("value", () => new CodeObjectCreateExpression("System.Int32", null));
            AssertExtensions.Throws<ArgumentNullException>("value", () => new CodeObjectCreateExpression(typeof(int), null));
        }

        [Fact]
        public void Ctor_NullObjectInParameters_ThrowsArgumentNullException()
        {
            CodeExpression[] parameters = new CodeExpression[] { null };

            AssertExtensions.Throws<ArgumentNullException>("value", () => new CodeObjectCreateExpression(new CodeTypeReference(), parameters));
            AssertExtensions.Throws<ArgumentNullException>("value", () => new CodeObjectCreateExpression("System.Int32", parameters));
            AssertExtensions.Throws<ArgumentNullException>("value", () => new CodeObjectCreateExpression(typeof(int), parameters));
        }

        [Theory]
        [MemberData(nameof(CodeTypeReference_TestData))]
        public void CreateType_Set_Get_ReturnsExpected(CodeTypeReference value)
        {
            var objectCreate = new CodeObjectCreateExpression();
            objectCreate.CreateType = value;
            Assert.Equal((value ?? new CodeTypeReference("")).BaseType, objectCreate.CreateType.BaseType);
        }

        [Fact]
        public void Parameters_AddMultiple_ReturnsExpected()
        {
            var objectCreate = new CodeObjectCreateExpression();

            CodeExpression expression1 = new CodePrimitiveExpression("Value1");
            objectCreate.Parameters.Add(expression1);
            Assert.Equal(new CodeExpression[] { expression1 }, objectCreate.Parameters.Cast<CodeExpression>());

            CodeExpression expression2 = new CodePrimitiveExpression("Value2");
            objectCreate.Parameters.Add(expression2);
            Assert.Equal(new CodeExpression[] { expression1, expression2 }, objectCreate.Parameters.Cast<CodeExpression>());
        }
    }
}