Testing with EF Core

Real DB

[TestMethod]
public void CanInsertSamuraiIntoDatabase()
{
    using var context = new SamuraiContext();
    context.Database.EnsureDeleted();
    context.Database.EnsureCreated();

    var samurai = new Samurai {Name = "Test"};
    context.Samurais.Add(samurai);
    context.SaveChanges();

    Assert.AreNotEqual(0, samurai.Id);
}

InMemory Provider

It emulates an RDBMS via in-memory lists. It’s quite simple though, it does not support things such as raw SQL.

[TestMethod]
public void CanInsertSamuraiIntoDatabaseWithInMemoryDB()
{
    var builder = new DbContextOptionsBuilder<SamuraiContext>();
    builder.UseInMemoryDatabase("CanInsertSamurai");

    using var context = new SamuraiContext(builder.Options);

    var samurai = new Samurai {Name = "Test"};
    context.Samurais.Add(samurai);
    Assert.AreEqual(EntityState.Added, context.Entry(samurai).State);
}

When configuring in-memory database, we need to provide a name for it. This way, we can use the same in-memory DB from multiple testse (or different ones, with different names).

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