Verify.ReadableExpressions

Adds Verify support for Expression Trees using ReadableExpressions.

See Milestones for release notes.

Sponsors

Entity Framework Extensions

Entity Framework Extensions is a major sponsor and is proud to contribute to the development this project.

NuGet

• https://nuget.org/packages/Verify.ReadableExpressions

Usage

Enable

[ModuleInitializer]
public static void Init() =>
    VerifyReadableExpressions.Initialize();

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Sample Expression

Given a complex Expression:

// Complex calculation with conditional logic
// Equivalent to: p => p.Age < 30
//                     ? p.Salary * 1.15m
//                     : (p.Age < 50
//                         ? p.Salary * 1.08m
//                         : p.Salary * 1.03m)
public static Expression<Func<Person, decimal>> SalaryCalculation()
{
    var param = Expression.Parameter(typeof(Person));
    var ageProperty = Expression.Property(param, nameof(Person.Age));
    var salaryProperty = Expression.Property(param, nameof(Person.Salary));

    // Nested conditional: age-based salary multipliers
    var youngBonus = Expression.Multiply(
        salaryProperty,
        Expression.Constant(1.15m));
    var midBonus = Expression.Multiply(
        salaryProperty,
        Expression.Constant(1.08m));
    var seniorBonus = Expression.Multiply(
        salaryProperty,
        Expression.Constant(1.03m));

    var ageLessThan30 = Expression.LessThan(
        ageProperty,
        Expression.Constant(30));
    var ageLessThan50 = Expression.LessThan(
        ageProperty,
        Expression.Constant(50));

    var innerConditional = Expression.Condition(
        ageLessThan50,
        midBonus,
        seniorBonus);
    var outerConditional = Expression.Condition(
        ageLessThan30,
        youngBonus,
        innerConditional);

    return Expression.Lambda<Func<Person, decimal>>(outerConditional, param);
}

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Test

[Fact]
public Task VerifySalaryCalculation()
{
    var expression = ComplexExpressionTrees.SalaryCalculation();
    return Verify(expression);
}

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Resulting

person => (person.Age < 30)
  ? person.Salary * 1.15m
  : (person.Age < 50) ? person.Salary * 1.08m : person.Salary * 1.03m

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