Moq Entity Frameworks ExecuteSQLCommand

Question

I\'ve read that when using moq you cannot mock a non-virtual function. I\'ve also read that this should be possible now.. Is that true? If so, then I\'d like to mock the f

Answer 1

It is possible to mock ExecuteSqlCommand. It is however not straightforward.

Being an extension method you have to mock the internals. It ends up creating a RawSqlCommand and invoking ExecuteNonQuery on an IRelationalCommand. It gets further complicated as the extension method creates new objects to do the actual work, as well as there being is no interface for RawSqlCommand or DatabaseFacade, you've got to mock the concrete classes.

I ended up writing EntityFrameworkCore.Testing as there isn't anything else around that can do all the mocks (FromSql, ExecuteSqlCommand, DbQuery, the relational stuff that the in-memory provider can't do). Save yourself some time as the mocks are involved, I certainly would have used an existing package if there was one when I was looking.

If you do want to roll your own the mock set up for ExecuteSqlCommand/ExecuteSqlCommandAsync looks like the following:

var relationalCommandMock = new Mock();
relationalCommandMock
    .Setup(m => m.ExecuteNonQuery(It.IsAny(), It.IsAny>()))
    .Returns((IRelationalConnection providedConnection, IReadOnlyDictionary providedParameterValues) => executeSqlCommandResult);
relationalCommandMock
    .Setup(m => m.ExecuteNonQueryAsync(It.IsAny(), It.IsAny>(), It.IsAny()))
    .Returns((IRelationalConnection providedConnection, IReadOnlyDictionary providedParameterValues, CancellationToken providedCancellationToken) => Task.FromResult(executeSqlCommandResult));
var relationalCommand = relationalCommandMock.Object;

var rawSqlCommandMock = new Mock(MockBehavior.Strict, relationalCommand, new Dictionary());
rawSqlCommandMock.Setup(m => m.RelationalCommand).Returns(relationalCommand);
rawSqlCommandMock.Setup(m => m.ParameterValues).Returns(new Dictionary());
var rawSqlCommand = rawSqlCommandMock.Object;

var rawSqlCommandBuilderMock = new Mock();

rawSqlCommandBuilderMock
    .Setup(m => m.Build(It.IsAny(), It.IsAny>()))
    .Returns((string providedSql, IEnumerable