How to add Mock db tables in C# test cases - .net-core

Question

How to create mock db tables for the separate class file in test cases to access the service test case and also I need for that tables between parent and child relation
public static class MockTestData
{
// Test data for the DbSet<User> getter
public static IQueryable<EaepTieriiLangComp> Langcomps
{
get
{ return new List<EaepTieriiLangComp>
{
new EaepTieriiLangComp{EaepAssessmentId=1,LangCompId=1,IsPrimary ="Y",LangId =1,LangReadId=1,LangWrittenId=1,LangSpokenId=1,LangUnderstandId=1 },
new EaepTieriiLangComp{EaepAssessmentId=2,LangCompId=1 ,IsPrimary ="N",LangId =2,LangReadId=2,LangWrittenId=2,LangSpokenId=2,LangUnderstandId=2 }//Lang =obj,LangRead=objRead,LangSpoken =objSpeak,LangWritten=objWrite,LangUnderstand=objUnderstand
}.AsQueryable();
}
}
public static IQueryable<LookupLang> LookupLangs
{
get
{ return new List<LookupLang>
{
new LookupLang{LangId = 1,Description = "lang1",IsActive="Y"},
new LookupLang{LangId = 2,Description = "lang2",IsActive="N"}
}.AsQueryable();
}
}
}`
enter code here`
I tried for the above flow but i didnot get relatons for that tables

Answer 1

If you are using EF Core, you can create inmemory database, add data and make query to it.
Here is example:
First you need install Microsoft.EntityFrameworkCore.InMemory package. After this make options:
_options = new DbContextOptionsBuilder<SomeDbContext>()
.UseInMemoryDatabase(databaseName: "DbTest")
.Options;
using var context = new SomeDbContext(_options);
context.Database.EnsureCreated();
Then add your data:
context.AddRange(
new LookupLang{LangId = 1,Description = "lang1",IsActive="Y"},
new LookupLang{LangId = 2,Description = "lang2",IsActive="N"}
)
And now you can use context for testing purposes

Answer 2

Thank you so much advise to use EF core.InMemory package it is working fine now I followed below code
Inmemory class
using Assessments.TierIIQueryDataModel;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Text;
namespace AssessmentCommandTest.Helpers
{
public class InMemoryDataProviderQueryService : IDisposable
{
private bool disposedValue = false; // To detect redundant calls
public DbQueryContext CreateContextForInMemory()
{
var option = new DbContextOptionsBuilder<DbQueryContext>().UseInMemoryDatabase(databaseName: "Test_QueryDatabase").Options;
var context = new DbQueryContext(option);
if (context != null)
{
//context.Database.EnsureDeleted();
context.Database.EnsureCreated();
}
return context;
}
protected virtual void Dispose(bool disposing)
{
if (!disposedValue)
{
if (disposing)
{
}
disposedValue = true;
}
}
public void Dispose()
{
Dispose(true);
}
}
}
and access to DbQueryContext conext file in my code and write mock tables as below
using AssessmentCommandTest.Helpers;
using Assessments.TierIIQueryDataModel;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace AssessmentCommandTest.MockDbTables
{
public class MockQueryDbContext
{
public TierIIQueryContext MockTierIIQueryContexts()
{
//Create object for Inmemory DB provider
var factory = new InMemoryDataProviderQueryService();
//Get the instance of TierIIQueryContext
var context = factory.CreateContextForInMemory();
context.LookupLang.Add(new LookupLang { LangId = 1, Description = "Arabic", IsActive = "Y" });
context.LookupLang.Add(new LookupLang { LangId = 2, Description = "Bangali", IsActive = "Y" });
context.LookupLang.Add(new LookupLang { LangId = 3, Description = "English", IsActive = "Y" });
context.LookupLang.Add(new LookupLang { LangId = 4, Description = "French", IsActive = "Y" });
enter code here
context.SaveChanges();
return context;
}
}
}