sql-utilities/tests/Strata.SqlTools.SqlBreakdown.Tests/ExpressionTests/BooleanExpressionTests.cs

using Strata.SqlTools.SqlBreakdown.Classes;
using Strata.SqlTools.SqlBreakdown.Expressions;
using Strata.SqlTools.SqlBreakdown.Expressions.Conditional;
using Strata.SqlTools.SqlBreakdown.Expressions.Conditional.Comparisons;
using Strata.SqlTools.SqlBreakdown.Expressions.Conditional.Logical;

namespace Strata.SqlTools.SqlBreakdown.Tests.ExpressionTests;

[TestFixture]
public class BooleanExpressionTests : ExpressionTestsBase
{
    [Test]
    public void BooleanExpression_AndOperator_ChainsCorrectly()
    {
        // Arrange
        var greaterThan250Exp = new GreaterThanExpression(_costColumnExp, 250);
        BooleanExpression original = BooleanExpression.False;

        // Act
        original &= greaterThan250Exp;
        var firstResult = original;
        original &= greaterThan250Exp;
        var secondResult = original;

        // Assert
        Assert.That(firstResult, Is.Not.SameAs(BooleanExpression.False));
        Assert.Multiple(() =>
        {
            Assert.That(firstResult, Is.AssignableTo<BooleanExpression>());
            Assert.That(secondResult, Is.Not.SameAs(BooleanExpression.False));
        });
        Assert.That(secondResult, Is.TypeOf<AndExpression>());
    }

    [Test]
    public void BooleanExpression_ComplexWithOperators_CreatesExpression()
    {
        // Arrange
        var paramFoobar = new ParameterExpression("FOOBAR");

        // Act
#pragma warning disable S2178 // Short-circuit logic should be used in boolean contexts
        var andComp = _revenueColumnExp > 100 & _costColumnExp >= 250 | _nameColumnExp == paramFoobar;
#pragma warning restore S2178

        // Assert
        Assert.That(andComp, Is.Not.Null);
        Assert.That(andComp, Is.AssignableTo<BooleanExpression>());
    }

    private static IEnumerable<TestCaseData> BooleanExpressionTestCases()
    {
        var testCases = new[]
        {
            new ExpressionTestCase
            {
                Name = "GreaterThan_{m}",
                Arrange = new Dictionary<string, Expression>
                {
                    ["revenue"] = new RegisteredTableColumnExpression(2, "NET_REVENUE", new RegisteredTableSource(101, "CLIENT_DSS", "DEPT", "PES"))
                },
                Act = (columns, visitor) =>
                {
                    var revenue = columns["revenue"];
                    var greaterThan100Exp = new GreaterThanExpression(revenue, 100);
                    return greaterThan100Exp;
                },
                Assertions = result =>
                {
                    var expression = (BooleanExpression)result;
                    Assert.That(expression, Is.Not.Null);
                    Assert.That(expression, Is.TypeOf<GreaterThanExpression>());
                    return true;
                }
            },
            new ExpressionTestCase
            {
                Name = "And_{m}",
                Arrange = new Dictionary<string, Expression>
                {
                    ["revenue"] = new RegisteredTableColumnExpression(2, "NET_REVENUE", new RegisteredTableSource(101, "CLIENT_DSS", "DEPT", "PES")),
                    ["cost"] = new RegisteredTableColumnExpression(3, "COST", new RegisteredTableSource(101, "CLIENT_DSS", "DEPT", "PES"))
                },
                Act = (columns, visitor) =>
                {
                    var revenue = columns["revenue"];
                    var cost = columns["cost"];
                    var greaterThan100Exp = new GreaterThanExpression(revenue, 100);
                    var greaterThan250Exp = new GreaterThanExpression(cost, 250);
                    var andExp1 = new AndExpression(greaterThan100Exp, greaterThan250Exp);
                    return andExp1;
                },
                Assertions = result =>
                {
                    var expression = (BooleanExpression)result;
                    Assert.That(expression, Is.Not.Null);
                    Assert.That(expression, Is.TypeOf<AndExpression>());
                    return true;
                }
            },
            new ExpressionTestCase
            {
                Name = "Or_{m}",
                Arrange = new Dictionary<string, Expression>
                {
                    ["revenue"] = new RegisteredTableColumnExpression(2, "NET_REVENUE", new RegisteredTableSource(101, "CLIENT_DSS", "DEPT", "PES")),
                    ["cost"] = new RegisteredTableColumnExpression(3, "COST", new RegisteredTableSource(101, "CLIENT_DSS", "DEPT", "PES"))
                },
                Act = (columns, visitor) =>
                {
                    var revenue = columns["revenue"];
                    var cost = columns["cost"];
#pragma warning disable S2178 // Short-circuit logic should be used in boolean contexts
                    var orComp = revenue > 100 | cost >= 250;
#pragma warning restore S2178
                    return orComp;
                },
                Assertions = result =>
                {
                    var expression = (BooleanExpression)result;
                    Assert.That(expression, Is.Not.Null);
                    Assert.That(expression, Is.AssignableTo<BooleanExpression>());
                    return true;
                }
            }
        };

        foreach (var testCase in testCases)
        {
            yield return new TestCaseData(testCase).SetName(testCase.Name);
        }
    }

    [TestCaseSource(nameof(BooleanExpressionTestCases))]
    public void BooleanExpression_GeneratesCorrectExpression(ExpressionTestCase testCase)
        => ExecuteExpressionTest(testCase);
}