public void Exists_WithNotExistingName_ShouldReturnFalse()
        {
            // Arrange
            StarStuffDbContext db = this.Database;
            TelescopeService   telescopeService = new TelescopeService(db);

            string telescopeName = this.GetFakeTelescopes().FirstOrDefault(t => t.Id == 1).Name;

            // Act
            bool result = telescopeService.Exists(telescopeName);

            // Assert
            Assert.False(result);
        }