jdescopingtool/NEW/tests/JdeScoping.DataAccess.Tests/DbConnectionFactoryTests.cs

using JdeScoping.DataAccess.Exceptions;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using NSubstitute;
using Shouldly;
using Xunit;

namespace JdeScoping.DataAccess.Tests;

/// <summary>
/// Unit tests for DbConnectionFactory.
/// </summary>
public class DbConnectionFactoryTests
{
    private readonly IConfiguration _configuration;
    private readonly ILogger<DbConnectionFactory> _logger;

    public DbConnectionFactoryTests()
    {
        _configuration = Substitute.For<IConfiguration>();
        _logger = Substitute.For<ILogger<DbConnectionFactory>>();
    }

    #region Constructor Tests

    [Fact]
    public void Constructor_NullConfiguration_ThrowsArgumentNullException()
    {
        // Act & Assert
        Should.Throw<ArgumentNullException>(() => new DbConnectionFactory(null!, _logger))
            .ParamName.ShouldBe("configuration");
    }

    [Fact]
    public void Constructor_NullLogger_ThrowsArgumentNullException()
    {
        // Act & Assert
        Should.Throw<ArgumentNullException>(() => new DbConnectionFactory(_configuration, null!))
            .ParamName.ShouldBe("logger");
    }

    [Fact]
    public void Constructor_ValidParameters_CreatesInstance()
    {
        // Act
        var factory = new DbConnectionFactory(_configuration, _logger);

        // Assert
        factory.ShouldNotBeNull();
    }

    #endregion

    #region CreateLotFinderConnectionAsync Tests

    [Fact]
    public async Task CreateLotFinderConnectionAsync_MissingConnectionString_ThrowsConnectionException()
    {
        // Arrange
        _configuration.GetConnectionString("LotFinderDB").Returns((string?)null);
        var factory = new DbConnectionFactory(_configuration, _logger);

        // Act & Assert
        var ex = await Should.ThrowAsync<ConnectionException>(
            async () => await factory.CreateLotFinderConnectionAsync());

        ex.DataSource.ShouldBe("LotFinderDB");
        ex.Message.ShouldContain("Connection string not found");
    }

    [Fact]
    public async Task CreateLotFinderConnectionAsync_EmptyConnectionString_ThrowsConnectionException()
    {
        // Arrange
        _configuration.GetConnectionString("LotFinderDB").Returns(string.Empty);
        var factory = new DbConnectionFactory(_configuration, _logger);

        // Act & Assert
        var ex = await Should.ThrowAsync<ConnectionException>(
            async () => await factory.CreateLotFinderConnectionAsync());

        ex.DataSource.ShouldBe("LotFinderDB");
        ex.Message.ShouldContain("Connection string not found");
    }

    [Fact]
    public async Task CreateLotFinderConnectionAsync_InvalidConnectionString_ThrowsConnectionException()
    {
        // Arrange
        _configuration.GetConnectionString("LotFinderDB").Returns("Invalid connection string");
        var factory = new DbConnectionFactory(_configuration, _logger);

        // Act & Assert
        var ex = await Should.ThrowAsync<ConnectionException>(
            async () => await factory.CreateLotFinderConnectionAsync());

        ex.DataSource.ShouldBe("LotFinderDB");
        ex.Message.ShouldContain("Failed to open connection");
        ex.InnerException.ShouldNotBeNull();
    }

    [Fact]
    public async Task CreateLotFinderConnectionAsync_CancellationRequested_ThrowsOperationCanceledException()
    {
        // Arrange
        _configuration.GetConnectionString("LotFinderDB").Returns("Server=test;Database=test;");
        var factory = new DbConnectionFactory(_configuration, _logger);
        using var cts = new CancellationTokenSource();
        cts.Cancel();

        // Act & Assert
        await Should.ThrowAsync<OperationCanceledException>(
            async () => await factory.CreateLotFinderConnectionAsync(cts.Token));
    }

    #endregion

    #region CreateJdeConnectionAsync Tests

    [Fact]
    public async Task CreateJdeConnectionAsync_MissingConnectionString_ThrowsConnectionException()
    {
        // Arrange
        _configuration.GetConnectionString("JDE").Returns((string?)null);
        var factory = new DbConnectionFactory(_configuration, _logger);

        // Act & Assert
        var ex = await Should.ThrowAsync<ConnectionException>(
            async () => await factory.CreateJdeConnectionAsync());

        ex.DataSource.ShouldBe("JDE");
        ex.Message.ShouldContain("Connection string not found");
    }

    [Fact]
    public async Task CreateJdeConnectionAsync_InvalidConnectionString_ThrowsConnectionException()
    {
        // Arrange
        _configuration.GetConnectionString("JDE").Returns("Invalid oracle connection");
        var factory = new DbConnectionFactory(_configuration, _logger);

        // Act & Assert
        var ex = await Should.ThrowAsync<ConnectionException>(
            async () => await factory.CreateJdeConnectionAsync());

        ex.DataSource.ShouldBe("JDE");
        ex.Message.ShouldContain("Failed to open connection");
    }

    #endregion

    #region CreateJdeStageConnectionAsync Tests

    [Fact]
    public async Task CreateJdeStageConnectionAsync_MissingConnectionString_ThrowsConnectionException()
    {
        // Arrange
        _configuration.GetConnectionString("JDEStage").Returns((string?)null);
        var factory = new DbConnectionFactory(_configuration, _logger);

        // Act & Assert
        var ex = await Should.ThrowAsync<ConnectionException>(
            async () => await factory.CreateJdeStageConnectionAsync());

        ex.DataSource.ShouldBe("JDEStage");
        ex.Message.ShouldContain("Connection string not found");
    }

    #endregion

    #region CreateCmsConnectionAsync Tests

    [Fact]
    public async Task CreateCmsConnectionAsync_MissingConnectionString_ThrowsConnectionException()
    {
        // Arrange
        _configuration.GetConnectionString("CMS").Returns((string?)null);
        var factory = new DbConnectionFactory(_configuration, _logger);

        // Act & Assert
        var ex = await Should.ThrowAsync<ConnectionException>(
            async () => await factory.CreateCmsConnectionAsync());

        ex.DataSource.ShouldBe("CMS");
        ex.Message.ShouldContain("Connection string not found");
    }

    [Fact]
    public async Task CreateCmsConnectionAsync_InvalidConnectionString_ThrowsConnectionException()
    {
        // Arrange
        _configuration.GetConnectionString("CMS").Returns("Invalid oracle connection");
        var factory = new DbConnectionFactory(_configuration, _logger);

        // Act & Assert
        var ex = await Should.ThrowAsync<ConnectionException>(
            async () => await factory.CreateCmsConnectionAsync());

        ex.DataSource.ShouldBe("CMS");
        ex.Message.ShouldContain("Failed to open connection");
    }

    #endregion

    #region Logging Tests

    [Fact]
    public async Task CreateLotFinderConnectionAsync_InvalidConnection_LogsError()
    {
        // Arrange
        _configuration.GetConnectionString("LotFinderDB").Returns("Invalid connection string");
        var factory = new DbConnectionFactory(_configuration, _logger);

        // Act
        try
        {
            await factory.CreateLotFinderConnectionAsync();
        }
        catch (ConnectionException)
        {
            // Expected
        }

        // Assert - verify error logging was called (at least once - there may also be debug logs)
        _logger.Received().Log(
            LogLevel.Error,
            Arg.Any<EventId>(),
            Arg.Any<object>(),
            Arg.Any<Exception>(),
            Arg.Any<Func<object, Exception?, string>>());
    }

    #endregion
}