// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.

namespace System.Data.Entity.Config
{
    using System.Data.Common;
    using System.Data.Entity.Infrastructure;
    using System.Data.Entity.Resources;
    using System.Data.SqlClient;
    using Moq;
    using Xunit;

    public class InvariantNameResolverTests
    {
        [Fact]
        public void GetService_returns_null_for_non_IProviderInvariantName_types()
        {
            Assert.Null(new InvariantNameResolver(new Mock<DbProviderFactory>().Object, "920.FTW").GetService<Random>());
        }

        [Fact]
        public void GetService_throws_for_null_or_incorrect_key_type()
        {
            Assert.Equal(
                Strings.DbProviderFactoryNotPassedToResolver,
                Assert.Throws<ArgumentException>(
                    () => new InvariantNameResolver(new Mock<DbProviderFactory>().Object, "920.FTW")
                              .GetService<IProviderInvariantName>(null)).Message);

            Assert.Equal(
                Strings.DbProviderFactoryNotPassedToResolver,
                Assert.Throws<ArgumentException>(
                    () => new InvariantNameResolver(new Mock<DbProviderFactory>().Object, "920.FTW")
                              .GetService<IProviderInvariantName>("Oh No!")).Message);
        }

        [Fact]
        public void GetService_returns_the_invariant_name_registered_for_the_given_DbProviderFactory()
        {
            var factory = new Mock<DbProviderFactory>().Object;

            Assert.Equal(
                "920.FTW",
                new InvariantNameResolver(factory, "920.FTW").GetService<IProviderInvariantName>(factory).Name);
        }

        [Fact]
        public void GetService_returns_null_for_a_different_DbProviderFactory()
        {
            Assert.Null(
                new InvariantNameResolver(new Mock<DbProviderFactory>().Object, "920.FTW")
                    .GetService<IProviderInvariantName>(SqlClientFactory.Instance));
        }
    }
}