public void SubstituteAndUnquoteRewriter_Unchanged()
{
var inner = Expression.Lambda(Expression.Constant(42));
var lambda = Expression.Lambda(inner);
var rewriter = new SubstituteAndUnquoteRewriter(EmptyTypeMap); var result = (LambdaExpression)rewriter.Visit(lambda);
Assert.AreSame(lambda, result);
}
public void SubstituteAndUnquoteRewriter_IdentityFunctionIncorrectSignature_ThrowsInvalidOperation()
{
var rewriter = new SubstituteAndUnquoteRewriter(EmptyTypeMap);
var inner = Expression.Constant(42);
var identity = Expression.Invoke(Expression.Parameter(typeof(Func <int, long>), Constants.IdentityFunctionUri), inner);
Assert.ThrowsException <InvalidOperationException>(() => rewriter.Apply(identity));
}
public void SubstituteAndUnquoteRewriter_IdentitySignature_Unchanged()
{
var rewriter = new SubstituteAndUnquoteRewriter(EmptyTypeMap);
var inner = Expression.Constant(42);
var notIdentity = Expression.Invoke(Expression.Parameter(typeof(Func <int, int>), "foo"), inner);
var result = rewriter.Apply(notIdentity);
Assert.AreSame(notIdentity, result);
}
public void SubstituteAndUnquoteRewriter_RemoveIdentityFunctions()
{
var rewriter = new SubstituteAndUnquoteRewriter(EmptyTypeMap);
var inner = Expression.Constant(42);
var identity = Expression.Invoke(Expression.Parameter(typeof(Func <int, int>), Constants.IdentityFunctionUri), inner);
var result = rewriter.Apply(identity);
Assert.AreSame(inner, result);
}
public void SubstituteAndUnquoteRewriter_PartialChange()
{
var inner = Expression.Lambda(Expression.Negate(Expression.Constant(42)));
var quoted = Expression.Quote(inner);
var lambda = Expression.Lambda(quoted);
Assert.AreEqual(typeof(Func <Expression <Func <int> > >), lambda.Type);
var rewriter = new SubstituteAndUnquoteRewriter(EmptyTypeMap);
var unquoted = (LambdaExpression)rewriter.Apply(lambda);
var result = unquoted.Compile().DynamicInvoke() as Func <int>;
Assert.IsNotNull(result);
Assert.AreEqual(-42, result());
}