public void Transform_WithTwoArgument_TypeString()
{
var method = typeof(string).GetMethod("IndexOf", new[] { typeof(string), typeof(int) });
var objectExpression = Expression.Constant("Test");
var argument1 = Expression.Constant("es");
var argument2 = Expression.Constant(2);
var expression = Expression.Call(objectExpression, method, argument1, argument2);
var transformer = new IndexOfMethodCallTransformer();
var result = transformer.Transform(expression);
var startIndexExpression = Expression.Add(argument2, new SqlLiteralExpression(1));
var lenArgExpression = new SqlLengthExpression(argument1);
var leftTestPredicate = Expression.Equal(lenArgExpression, new SqlLiteralExpression(0));
var lenObjectExpression = new SqlLengthExpression(objectExpression);
var rightTestpredicate = Expression.LessThanOrEqual(startIndexExpression, lenObjectExpression);
var testPredicate = Expression.AndAlso(leftTestPredicate, rightTestpredicate);
var charIndexExpression = new SqlFunctionExpression(
expression.Type, "CHARINDEX", argument1, objectExpression, startIndexExpression);
var elseValue = Expression.Subtract(charIndexExpression, new SqlLiteralExpression(1));
var expectedResult = Expression.Condition(testPredicate, argument2, elseValue);
SqlExpressionTreeComparer.CheckAreEqualTrees(expectedResult, result);
}
public void Transform_WithOneArgument_TypeChar()
{
var method = typeof(string).GetMethod("IndexOf", new[] { typeof(char) });
var objectExpression = Expression.Constant("Test");
var argument1 = Expression.Constant('e');
var expression = Expression.Call(objectExpression, method, argument1);
var transformer = new IndexOfMethodCallTransformer();
var result = transformer.Transform(expression);
var lenExpression = new SqlLengthExpression(argument1);
var testPredicate = Expression.Equal(lenExpression, new SqlLiteralExpression(0));
var charIndexExpression = new SqlFunctionExpression(
expression.Type, "CHARINDEX", argument1, objectExpression);
var elseValue = Expression.Subtract(charIndexExpression, new SqlLiteralExpression(1));
var expectedResult = Expression.Condition(testPredicate, new SqlLiteralExpression(0), elseValue);
SqlExpressionTreeComparer.CheckAreEqualTrees(expectedResult, result);
}