ChatBot/ChatBot.Tests/Configuration/Validators/TelegramBotSettingsValidatorTests.cs

using ChatBot.Models.Configuration;
using ChatBot.Models.Configuration.Validators;
using FluentAssertions;

namespace ChatBot.Tests.Configuration.Validators;

public class TelegramBotSettingsValidatorTests
{
    private readonly TelegramBotSettingsValidator _validator = new();

    [Fact]
    public void Validate_ShouldReturnSuccess_WhenSettingsAreValid()
    {
        // Arrange
        var settings = new TelegramBotSettings
        {
            BotToken = "1234567890:ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijk",
        };

        // Act
        var result = _validator.Validate(null, settings);

        // Assert
        result.Succeeded.Should().BeTrue();
    }

    [Fact]
    public void Validate_ShouldReturnFailure_WhenBotTokenIsEmpty()
    {
        // Arrange
        var settings = new TelegramBotSettings { BotToken = "" };

        // Act
        var result = _validator.Validate(null, settings);

        // Assert
        result.Succeeded.Should().BeFalse();
        result.Failures.Should().Contain(f => f.Contains("Telegram bot token is required"));
    }

    [Fact]
    public void Validate_ShouldReturnFailure_WhenBotTokenIsTooShort()
    {
        // Arrange
        var settings = new TelegramBotSettings
        {
            BotToken = "1234567890:ABC", // 15 chars, too short
        };

        // Act
        var result = _validator.Validate(null, settings);

        // Assert
        result.Succeeded.Should().BeFalse();
        result
            .Failures.Should()
            .Contain(f => f.Contains("Telegram bot token must be at least 40 characters"));
    }

    [Theory]
    [InlineData(null)]
    [InlineData("")]
    [InlineData("   ")]
    public void Validate_ShouldReturnFailure_WhenBotTokenIsNullOrWhitespace(string? botToken)
    {
        // Arrange
        var settings = new TelegramBotSettings { BotToken = botToken! };

        // Act
        var result = _validator.Validate(null, settings);

        // Assert
        result.Succeeded.Should().BeFalse();
        result.Failures.Should().Contain(f => f.Contains("Telegram bot token is required"));
    }
}