tests/unit-tests/MergeSame_Test.cpp

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#include "stp/cpp_interface.h"
#include "stp/Parser/parser.h"
#include "stp/Simplifier/MergeSame.h"
#include <gtest/gtest.h>
#include <stdio.h>


  const std::string start_input = R"(
  (set-logic QF_BV)
  (set-info :smt-lib-version 2.0)
  (set-info :category "check")
  (set-info :status sat)

  (declare-fun v0 () (_ BitVec 20))
  (declare-fun v1 () (_ BitVec 20))
  (declare-fun v2 () (_ BitVec 20))
  (declare-fun v3 () (_ BitVec 20))
  (declare-fun v4 () (_ BitVec 20))

  (declare-fun x0 () (_ BitVec 1))

  (declare-fun a () Bool)
  (declare-fun b () Bool)
  (declare-fun c () Bool)

  (push 1)
  )";

struct Context
{
   stp::STPMgr mgr;
   SimplifyingNodeFactory snf;
   stp::Cpp_interface interface;
   stp::MergeSame ms;

   Context() :
   snf (*(mgr.hashingNodeFactory), mgr),
   interface(mgr, &snf),
   ms(&mgr, &snf)
   { 
    mgr.defaultNodeFactory = &snf;
    interface.startup();
    stp::GlobalParserBM = &mgr;
    stp::GlobalParserInterface = &interface;
   }
   
   ASTNode process(std::string input)
   {
      stp::SMT2ScanString((start_input + input).c_str());
      stp::SMT2Parse();
      // TODO assert it was parsed properly.
      smt2lex_destroy();
      ASTNode n = mgr.CreateNode(stp::AND, mgr.GetAsserts());
      std::cerr << "Pre merge " << n;
      n = ms.topLevel(n);
      std::cerr << "Post merge "<< n;
      return n;
    }
};

TEST(MergeSame_Test , __LINE__)
{
    const std::string input = R"(
    (assert (or a b) )
    (assert (or a c) )
    )";


  Context c;
  ASTNode n = c.process(input);
  ASSERT_EQ(n, c.snf.CreateNode(stp::OR, {c.mgr.LookupOrCreateSymbol("a"), c.snf.CreateNode(stp::AND, {c.mgr.LookupOrCreateSymbol("b"), c.mgr.LookupOrCreateSymbol("c")} )}));
}

TEST(MergeSame_Test , __LINE__)
{
    const std::string input = R"(
    (assert (or (not a)  (not b)) )
    (assert (or a b) )
    )";

  Context c;
  ASTNode n = c.process(input);
  ASSERT_EQ(n, c.snf.CreateNode(stp::XOR, {c.mgr.LookupOrCreateSymbol("a"), c.mgr.LookupOrCreateSymbol("b") }));
}

TEST(MergeSame_Test , __LINE__)
{
    const std::string input = R"(
    (assert (or  a  (not b)) )
    (assert (or (not a) b) )
    )";

  Context c;
  ASTNode n = c.process(input);
  ASSERT_EQ(n, c.snf.CreateNode(stp::NOT, {c.snf.CreateNode(stp::XOR, {c.mgr.LookupOrCreateSymbol("a"), c.mgr.LookupOrCreateSymbol("b") })}));
}