Effort (EF Unit Testing) giving errors

Question

I am trying to do unit testing on some classes that reply on an Entity Framework DB Context. For help, I managed to find a library called Effort, which seems to be a little old, and not very well documented, but it seems to work, and seems to be quite popular.

I am trying to use a CSV data loader.

When doing a ToArray() I receive an exceptions saying Sequence contains no matching element .

Any ideas on what I might be doing incorrectly? Or if not a different library I might want to give a chance?

A few snippets:

[Table("SEC_USER")]
public class SecUser {
    [Key][Column("USERID")]
    public int UserId { get; set; }

    [Column("USERNAME")]
    public string UserName { get; set; }
}

DB Context:

public class MusketeerDbContext : DbContext
{
    public virtual IDbSet<IbsCommunity> Communities { get; set; }
    public virtual IDbSet<IbsFunctionLinkLocation> Functionlinklocations { get; set; }
    public virtual IDbSet<IbsInstance> Instances { get; set; }
    public virtual IDbSet<SecUser> Users { get; set; }
    public virtual IDbSet<IbsFieldType> FieldTypes { get; set; }
    public virtual IDbSet<IbsLink> Links { get; set; }
    public virtual IDbSet<IbsFieldFll> FieldFlls { get; set; }
    public virtual IDbSet<IbsFieldValue> FieldValues { get; set; }

    public MusketeerDbContext() : base("name=EGS.My.MySettings.Conn") { }
    public MusketeerDbContext(DbConnection connection) : base(connection, true) { }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.HasDefaultSchema("SA");
        modelBuilder.Conventions.Add(new FunctionConvention(typeof(OracleFunctions)));

        modelBuilder.Entity<IbsFieldValue>()
            .HasMany(fv => fv.InstancesFieldValues)
            .WithMany(i => i.InstancesFieldValues)
            .Map(mm =>
            {
                mm.MapLeftKey("FIELDVALUEID");
                mm.MapRightKey("INSTANCEID");
                mm.ToTable("IBS_INSTANCEFIELDVALUE");
            });
    }
}

public static class OracleFunctions
{
    [Function(FunctionType.BuiltInFunction, "TO_CHAR")]
    public static string ToChar(this int value) => Function.CallNotSupported<string>();

    [Function(FunctionType.BuiltInFunction, "TO_NCHAR")]
    public static string ToChar(this string value) => Function.CallNotSupported<string>();
}

The SEC_USER.csv:

USERID,USERNAME
"1","Jonathan"

The Test:

var path = @"C:\...\CSVs";
var dataLoader = new Effort.DataLoaders.CsvDataLoader(path);
var context = Effort.DbConnectionFactory.CreateTransient(dataLoader);
db = new MusketeerDbContext(context);
var users = db.Users.ToArray();

System.InvalidOperationException:

Message: "Sequence contains no matching element"
InnerException: null
StackTrace:
    at System.Linq.Enumerable.Single[TSource](IEnumerable`1 source, Func`2 predicate)
    at System.Data.Entity.Utilities.DbProviderManifestExtensions.GetStoreTypeFromName(DbProviderManifest providerManifest, String name)
    at System.Data.Entity.ModelConfiguration.Configuration.Properties.Primitive.PrimitivePropertyConfiguration.ConfigureColumn(EdmProperty column, EntityType table, DbProviderManifest providerManifest)
    at System.Data.Entity.ModelConfiguration.Configuration.Properties.Primitive.PrimitivePropertyConfiguration.Configure(EdmProperty column, EntityType table, DbProviderManifest providerManifest, Boolean allowOverride, Boolean fillFromExistingConfiguration)
    at System.Data.Entity.ModelConfiguration.Configuration.Properties.Primitive.PrimitivePropertyConfiguration.<>c__DisplayClass4.<Configure>b__3(Tuple`2 pm)
    at System.Data.Entity.Utilities.IEnumerableExtensions.Each[T](IEnumerable`1 ts, Action`1 action)
    at System.Data.Entity.ModelConfiguration.Configuration.Properties.Primitive.PrimitivePropertyConfiguration.Configure(IEnumerable`1 propertyMappings, DbProviderManifest providerManifest, Boolean allowOverride, Boolean fillFromExistingConfiguration)
    at System.Data.Entity.ModelConfiguration.Configuration.Types.StructuralTypeConfiguration.ConfigurePropertyMappings(IList`1 propertyMappings, DbProviderManifest providerManifest, Boolean allowOverride)
    at System.Data.Entity.ModelConfiguration.Configuration.Types.EntityTypeConfiguration.ConfigurePropertyMappings(DbDatabaseMapping databaseMapping, EntityType entityType, DbProviderManifest providerManifest, Boolean allowOverride)
    at System.Data.Entity.ModelConfiguration.Configuration.Types.EntityTypeConfiguration.Configure(EntityType entityType, DbDatabaseMapping databaseMapping, DbProviderManifest providerManifest)
    at System.Data.Entity.ModelConfiguration.Configuration.ModelConfiguration.ConfigureEntityTypes(DbDatabaseMapping databaseMapping, ICollection`1 entitySets, DbProviderManifest providerManifest)
    at System.Data.Entity.ModelConfiguration.Configuration.ModelConfiguration.Configure(DbDatabaseMapping databaseMapping, DbProviderManifest providerManifest)
    at System.Data.Entity.DbModelBuilder.Build(DbProviderManifest providerManifest, DbProviderInfo providerInfo)
    at System.Data.Entity.DbModelBuilder.Build(DbConnection providerConnection)
    at System.Data.Entity.Internal.LazyInternalContext.CreateModel(LazyInternalContext internalContext)
    at System.Data.Entity.Internal.RetryLazy`2.GetValue(TInput input)
    at System.Data.Entity.Internal.LazyInternalContext.InitializeContext()
    at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)
    at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()
    at System.Data.Entity.Internal.Linq.InternalSet`1.GetEnumerator()
    at System.Data.Entity.Infrastructure.DbQuery`1.System.Collections.Generic.IEnumerable<TResult>.GetEnumerator()
    at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
    at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
    at Igs.Musketeer.DbRepository.Tests.SecurityRepositoryTest..ctor() in C:\Users\me\Source\Repos\Musketeer\Igs.Musketeer.DbRepositoryTests\SecurityRepositoryTest.cs:line 21

Answer 1

I've just had this issue and I discovered the problem was that I was using the ColumnType data annotation. Even when I changed to using the model builder convention of HasColumnType , I still got the exact same error. I'm guessing one of your entities has that data annotation (or convention)?

If that's the case, the simplest fix would be to remove the data annotation. If not possible, I created a virtual property (eg public virtual bool IsInMemoryContext { get; } = false; ) on the DbContext that I overrode in my tests - public override bool IsInMemoryContext { get; } = true; public override bool IsInMemoryContext { get; } = true; , and in the OnModelCreating method, I checked if this property was set, before adding the column types.

if (!IsInMemoryContext)
{
    modelBuilder.Entity<AuditLog>()
        .Property(e => e.EventType)
        .HasColumnType("char");
}

More information on the error can be found here: GitHub issue with Effort