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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Text;
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using Shouldly;
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using Xunit;
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namespace Volo.Abp.Specifications
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{
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public class Specification_Tests
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{
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private readonly IQueryable<Customer> _customers;
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public Specification_Tests()
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{
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_customers = new List<Customer>
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{
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new Customer("John", 17, 47000, "England"),
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new Customer("Tuana", 2, 500, "Turkey"),
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new Customer("Martin", 43, 16000, "USA"),
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new Customer("Lee", 32, 24502, "China"),
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new Customer("Douglas", 42, 42000, "England"),
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new Customer("Abelard", 14, 2332, "German"),
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new Customer("Neo", 16, 120000, "USA"),
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new Customer("Daan", 39, 6000, "Netherlands"),
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new Customer("Alessandro", 22, 8271, "Italy"),
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new Customer("Noah", 33, 82192, "Belgium")
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}.AsQueryable();
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}
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[Fact]
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public void Any_Should_Return_All()
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{
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_customers
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.Where(new AnySpecification<Customer>()) //Implicitly converted to Expression!
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.Count()
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.ShouldBe(_customers.Count());
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}
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[Fact]
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public void None_Should_Return_Empty()
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{
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_customers
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.Where(new NoneSpecification<Customer>().ToExpression())
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.Count()
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.ShouldBe(0);
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}
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[Fact]
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public void Not_Should_Return_Reverse_Result()
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{
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_customers
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.Where(new EuropeanCustomerSpecification().Not().ToExpression())
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.Count()
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.ShouldBe(3);
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}
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[Fact]
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public void Should_Support_Native_Expressions_And_Combinations()
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{
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_customers
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.Where(new ExpressionSpecification<Customer>(c => c.Age >= 18).ToExpression())
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.Count()
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.ShouldBe(6);
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_customers
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.Where(new EuropeanCustomerSpecification().And(new ExpressionSpecification<Customer>(c => c.Age >= 18)).ToExpression())
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.Count()
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.ShouldBe(4);
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}
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[Fact]
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public void CustomSpecification_Test()
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{
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_customers
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.Where(new EuropeanCustomerSpecification().ToExpression())
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.Count()
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.ShouldBe(7);
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_customers
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.Where(new Age18PlusCustomerSpecification().ToExpression())
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.Count()
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.ShouldBe(6);
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_customers
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.Where(new BalanceCustomerSpecification(10000, 30000).ToExpression())
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.Count()
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.ShouldBe(2);
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_customers
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.Where(new PremiumCustomerSpecification().ToExpression())
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.Count()
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.ShouldBe(3);
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}
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[Fact]
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public void IsSatisfiedBy_Tests()
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{
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new PremiumCustomerSpecification().IsSatisfiedBy(new Customer("David", 49, 55000, "USA")).ShouldBeTrue();
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new PremiumCustomerSpecification().IsSatisfiedBy(new Customer("David", 49, 200, "USA")).ShouldBeFalse();
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new PremiumCustomerSpecification().IsSatisfiedBy(new Customer("David", 12, 55000, "USA")).ShouldBeFalse();
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}
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[Fact]
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public void CustomSpecification_Composite_Tests()
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{
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_customers
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.Where(new EuropeanCustomerSpecification().And(new Age18PlusCustomerSpecification()).ToExpression())
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.Count()
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.ShouldBe(4);
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_customers
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.Where(new EuropeanCustomerSpecification().Not().And(new Age18PlusCustomerSpecification()).ToExpression())
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.Count()
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.ShouldBe(2);
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_customers
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.Where(new Age18PlusCustomerSpecification().AndNot(new EuropeanCustomerSpecification()).ToExpression())
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.Count()
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.ShouldBe(2);
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}
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private class Customer
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{
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public string Name { get; private set; }
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public byte Age { get; private set; }
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public long Balance { get; private set; }
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public string Location { get; private set; }
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public Customer(string name, byte age, long balance, string location)
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{
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Name = name;
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Age = age;
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Balance = balance;
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Location = location;
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}
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}
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private class EuropeanCustomerSpecification : Specification<Customer>
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{
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public override Expression<Func<Customer, bool>> ToExpression()
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{
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return c => c.Location == "England" ||
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c.Location == "Turkey" ||
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c.Location == "German" ||
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c.Location == "Netherlands" ||
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c.Location == "Italy" ||
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c.Location == "Belgium";
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}
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}
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private class Age18PlusCustomerSpecification : Specification<Customer>
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{
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public override Expression<Func<Customer, bool>> ToExpression()
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{
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return c => c.Age >= 18;
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}
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}
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private class BalanceCustomerSpecification : Specification<Customer>
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{
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public int MinBalance { get; }
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public int MaxBalance { get; }
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public BalanceCustomerSpecification(int minBalance, int maxBalance)
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{
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MinBalance = minBalance;
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MaxBalance = maxBalance;
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}
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public override Expression<Func<Customer, bool>> ToExpression()
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{
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return c => c.Balance >= MinBalance && c.Balance <= MaxBalance;
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}
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}
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private class PremiumCustomerSpecification : AndSpecification<Customer>
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{
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public PremiumCustomerSpecification()
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: base(new Age18PlusCustomerSpecification(), new BalanceCustomerSpecification(20000, int.MaxValue))
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{
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}
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}
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}
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}
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Yunus Emre Kalkan
7 years ago