public async Task Filter_IEnumerable_Count(TestDataRow <string, int> row)
{
// Arrange
var filterstring = row.TestValue;
var expected = row.Expected;
var message = row.Message;
var parser = new FilterExpressionParser <Entity1>(FilterExpressionParserActionDictionary <Entity1> .Instance);
var filter = await parser.ParseAsFilterAsync(filterstring, true);
// Act
var count = filter.Count();
// Assert
Assert.AreEqual(expected, count, message);
}