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В коде я просто использую:

 public interface IDatabase
{
    void Save();
}


public class SqlDatabase : IDatabase
{
    public void Save()
    {
        Console.WriteLine("Saving data to Database");
    }
}
 

// Простой класс вызова…отлично работает!

IDatabase database = new SqlDatabase();

Как мне это сделать в MOQ?
Mock<IDatabase> mockDatabase = new Mock<SqlDatabase>(); не работает!!!

Ошибка CS0029 Не удается неявно преобразовать тип SQLDatabase в IDatabase

/////// МОДУЛЬНЫЙ ТЕСТ

     [Fact]
                public void SaveToDatabase()
                {
                    string comment = "Team, I know that times are tough! Product sales have been disappointing for the past three quarters. We have a competitive product, but we need to do a better job of selling it!";
        
                    Mock<IDatabase> mockDatabase = new Mock<IDatabase>();
    
// Not Required!
    // Mock<AnalyzerModel> mockAnalyzerModel = new Mock<AnalyzerModel>();
                // mockDatabase.Setup(x => x.Save(mockAnalyzerModel.Object));
        
                    var sut = new ToneAnalyzerEngine(mockDatabase.Object);
                    var v = sut.Analyze(comment, MockToneAnalyzerResultSadness());
        
                    mockDatabase.Verify(x => x.Save(It.IsAny<AnalyzerModel>()), Times.Once);
        
                    mockDatabase.VerifyNoOtherCalls();
                }

/////// Code Called

        internal bool Analyze(string comment, ToneAnalyzerResult toneAnalyzerResult)
        {
            bool isPositive = IsPositive(toneAnalyzerResult);

            AnalyzerModel analyzerModel = CreateAnalyzerModel(Guid.NewGuid().ToString(), isPositive, comment);

            _database.Save(analyzerModel);
            return isPositive;
        }