ex-rep-01/EM-Qual.Test/QualDataTests.cs

using FluentAssertions;
using Xunit;

namespace EMQual.Test;

public sealed class QualDataTests
{
    [Fact]
    public void IsCountryMatch_None()
    {
        Match match = new(new TeamResult("Foo", 1), new TeamResult("Bar", 2));

        QualData.IsCountryMatch(match, "Baz")
            .Should().BeFalse("Country did not play in this match");
    }

    [Fact]
    public void IsCountryMatch_Home()
    {
        const string Country = "Baz";
        Match match = new(new TeamResult(Country, 1), new TeamResult("Bar", 2));

        QualData.IsCountryMatch(match, Country)
            .Should().BeTrue("Country participated in match");
    }

    [Fact]
    public void IsCountryMatch_Guest()
    {
        const string Country = "Baz";
        Match match = new(new TeamResult("Foo", 1), new TeamResult(Country, 2));

        QualData.IsCountryMatch(match, Country)
            .Should().BeTrue("Country participated in match");
    }

    [Fact]
    public void FilterMatchesByCountry_None()
    {
        var matches = new Match[]
        {
            new(new TeamResult("Foo", 3), new TeamResult("Bar", 0)),
            new(new TeamResult("Foo", 1), new TeamResult("Qux", 1))
        };

        QualData.FilterMatchesByCountry(matches, "Baz")
            .Should().NotBeNull("array has been created")
            .And.BeEmpty("no matches for the supplied country");
    }

    [Fact]
    public void FilterMatchesByCountry_Simple()
    {
        var matches = new Match[]
        {
            new(new TeamResult("Foo", 3), new TeamResult("Bar", 0)),
            new(new TeamResult("Qux", 1), new TeamResult("Foo", 1)),
            new(new TeamResult("Bar", 1), new TeamResult("Qux", 2))
        };

        QualData.FilterMatchesByCountry(matches, "Foo")
            .Should().NotBeNull("array has been created")
            .And.HaveCount(2, "country participated in two matches")
            .And.Contain(new[] { matches[0], matches[1] });
    }

    [Fact]
    public void ExtractUniqueCountryNames_Simple()
    {
        var matches = new Match[]
        {
            new(new TeamResult("Foo", 3), new TeamResult("Bar", 0)),
            new(new TeamResult("Qux", 1), new TeamResult("Foo", 1)),
            new(new TeamResult("Bar", 1), new TeamResult("Qux", 2)),
            new(new TeamResult("Baz", 3), new TeamResult("Qux", 1))
        };

        QualData.ExtractUniqueCountryNames(matches)
            .Should().NotBeNull("array has been created")
            .And.HaveCount(4, "number of different countries in all matches")
            .And.Contain(new[] { "Foo", "Bar", "Qux", "Baz" }, "names of the countries");
    }

    [Fact]
    public void IsContained_Empty()
    {
        QualData.IsContained("Foo", Array.Empty<string>())
            .Should().BeFalse("array is empty");
    }

    [Fact]
    public void IsContained_NotContained()
    {
        var possValues = new[] { "Bar", "Baz", "Qux" };

        QualData.IsContained("Foo", possValues)
            .Should().BeFalse("value not contained");
    }

    [Fact]
    public void IsContained_Contained()
    {
        var possValues = new[] { "Bar", "Baz", "Foo", "Qux" };

        QualData.IsContained("Foo", possValues)
            .Should().BeTrue("value is contained");
    }

    [Fact]
    public void IsContained_IgnoreCase()
    {
        var possValues = new[] { "Bar", "Baz", "Foo", "Qux" };

        QualData.IsContained("fOo", possValues)
            .Should().BeTrue("value is contained");
    }

    [Fact]
    public void TryParseMatch_Simple()
    {
        const string Line = "Foo;Bar;2;3";

        QualData.TryParseMatch(Line, out var parsedMatch)
            .Should().BeTrue("valid line could be parsed");

        parsedMatch.Should().NotBeNull("successful parse, instance created")
            .And.BeEquivalentTo(new Match(new TeamResult("Foo", 2), 
                    new TeamResult("Bar", 3)));
    }

    [Theory]
    [InlineData("Foo;Bar;2;-3", "invalid goals")]
    [InlineData("Foo;Bar;t;3", "invalid goals")]
    [InlineData("Foo;Bar;2", "missing value")]
    [InlineData("Foo;Bar;2;1;4", "superfluous value")]
    [InlineData("Foo;1;Bar;2", "wrong order")]
    [InlineData("Foo;;1;2", "empty name")]
    [InlineData("Foo-Bar-1-2", "invalid separator")]
    public void TryParseMatch_Invalid(string line, string reason)
    {
        QualData.TryParseMatch(line, out var parsedMatch)
            .Should().BeFalse($"line could not be parsed: {reason}");

        parsedMatch.Should().BeNull("parsing failed, no instance created");
    }

    [Fact]
    public void ReadMatchesFromFile_Simple()
    {
        var expectedMatches = new Match[]
        {
            new(new TeamResult("Belgien", 0), new TeamResult("Deutschland", 1)),
            new(new TeamResult("Kasachstan", 0), new TeamResult("Türkei", 3)),
            new(new TeamResult("Deutschland", 6), new TeamResult("Aserbaidschan", 1))
        };

        var matches = QualData.ReadMatchesFromFile("Data/valid.csv");

        matches.Should().NotBeNullOrEmpty("valid file containing valid matches processed")
            .And.HaveCount(3, "three matches defined in the file")
            .And.ContainInOrder(expectedMatches, "how the matches should have been parsed");
    }

    [Theory]
    [InlineData("Data/none.csv", "the file does not exist, so no entries could be parsed")]
    [InlineData("Data/empty_01.csv", "the file exists but is empty, so no entries could be parsed")]
    [InlineData("Data/empty_02.csv", "the file exists but contains only the header, so no entries could be parsed")]
    [InlineData("Data/invalid_01.csv", "the file contains unexpected information, so parsing failed")]
    [InlineData("Data/invalid_02.csv", "the file contains an invalid entry, so none are returned")]
    public void ReadMatchesFromFile_Invalid(string filePath, string reason)
    {
        QualData.ReadMatchesFromFile(filePath)
            .Should().NotBeNull("an array is created and returned in any case")
            .And.HaveCount(0, reason)
            .And.BeSameAs(Array.Empty<Match>(), "empty array created properly");
    }
}