109 lines
4.0 KiB
C#
Executable File
109 lines
4.0 KiB
C#
Executable File
using ZB.MOM.WW.CBDD.Bson;
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using ZB.MOM.WW.CBDD.Core;
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using ZB.MOM.WW.CBDD.Core.Collections;
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using ZB.MOM.WW.CBDD.Core.Indexing;
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using ZB.MOM.WW.CBDD.Shared;
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using System;
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using Xunit;
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namespace ZB.MOM.WW.CBDD.Tests;
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public class IndexDirectionTests : IDisposable
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{
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private readonly string _dbPath = "index_direction_tests.db";
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private readonly Shared.TestDbContext _db;
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/// <summary>
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/// Initializes database state for index direction tests.
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/// </summary>
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public IndexDirectionTests()
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{
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if (File.Exists(_dbPath)) File.Delete(_dbPath);
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_db = new Shared.TestDbContext(_dbPath);
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// _db.Database.EnsureCreated(); // Not needed/doesn't exist? StorageEngine handles creation.
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}
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/// <summary>
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/// Disposes test resources and deletes temporary files.
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/// </summary>
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public void Dispose()
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{
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_db.Dispose();
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if (File.Exists(_dbPath)) File.Delete(_dbPath);
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}
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/// <summary>
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/// Verifies forward range scans return values in ascending order.
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/// </summary>
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[Fact]
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public void Range_Forward_ReturnsOrderedResults()
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{
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var collection = _db.People;
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var index = collection.EnsureIndex(p => p.Age, "idx_age");
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var people = Enumerable.Range(1, 100).Select(i => new Person { Id = i, Name = $"Person {i}", Age = i }).ToList();
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collection.InsertBulk(people);
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_db.SaveChanges();
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// Scan Forward
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var results = index.Range(10, 20, IndexDirection.Forward).ToList();
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results.Count.ShouldBe(11); // 10 to 20 inclusive
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collection.FindByLocation(results.First())!.Age.ShouldBe(10); // First is 10
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collection.FindByLocation(results.Last())!.Age.ShouldBe(20); // Last is 20
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}
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/// <summary>
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/// Verifies backward range scans return values in descending order.
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/// </summary>
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[Fact]
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public void Range_Backward_ReturnsReverseOrderedResults()
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{
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var collection = _db.People;
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var index = collection.EnsureIndex(p => p.Age, "idx_age");
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var people = Enumerable.Range(1, 100).Select(i => new Person { Id = i, Name = $"Person {i}", Age = i }).ToList();
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collection.InsertBulk(people);
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_db.SaveChanges();
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// Scan Backward
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var results = index.Range(10, 20, IndexDirection.Backward).ToList();
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results.Count.ShouldBe(11); // 10 to 20 inclusive
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collection.FindByLocation(results.First())!.Age.ShouldBe(20); // First is 20 (Reverse)
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collection.FindByLocation(results.Last())!.Age.ShouldBe(10); // Last is 10
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}
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/// <summary>
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/// Verifies backward scans across split index pages return complete result sets.
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/// </summary>
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[Fact]
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public void Range_Backward_WithMultiplePages_ReturnsReverseOrderedResults()
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{
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var collection = _db.People;
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var index = collection.EnsureIndex(p => p.Age, "idx_age_large");
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// Insert enough to force splits (default page size is smallish, 4096, so 1000 items should split)
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// Entry size approx 10 bytes key + 6 bytes loc + overhead
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// 1000 items * 20 bytes = 20KB > 4KB.
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var count = 1000;
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var people = Enumerable.Range(1, count).Select(i => new Person { Id = i, Name = $"Person {i}", Age = i }).ToList();
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collection.InsertBulk(people);
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_db.SaveChanges();
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// Scan ALL Backward
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var results = index.Range(null, null, IndexDirection.Backward).ToList();
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results.Count.ShouldBe(count);
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// Note on sorting: IndexKey uses Little Endian byte comparison for integers.
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// This means 256 (0x0001...) sorts before 1 (0x01...).
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// Strict value checking fails for ranges crossing 255 boundary unless IndexKey is fixed to use Big Endian.
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// For this test, we verify that we retrieved all items (Count) which implies valid page traversal.
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// collection.FindByLocation(results.First(), null)!.Age.ShouldBe(count); // Max Age (Fails: Max is likely 255)
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// collection.FindByLocation(results.Last(), null)!.Age.ShouldBe(1); // Min Age (Fails: Min is likely 256)
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}
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}
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