From: Tim King <taking@cs.nyu.edu>
Date: Thu, 25 Feb 2010 01:05:40 +0000 (+0000)
Subject: Created basic node builder and kind tests. Also fixed a couple of node builder problems.
X-Git-Tag: cvc5-1.0.0~9224
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f716b67e7bedd90c4dd43617158c0f55c1811334;p=cvc5.git

Created basic node builder and kind tests. Also fixed a couple of node builder problems.
---

diff --git a/src/expr/node_builder.h b/src/expr/node_builder.h
index d79d5ad54..cd34c415b 100644
--- a/src/expr/node_builder.h
+++ b/src/expr/node_builder.h
@@ -214,6 +214,7 @@ public:
   operator Node();
 
   inline void toStream(std::ostream& out) const {
+    Assert(!d_used, "NodeBuilder is one-shot only; tried to access it after conversion");
     d_nv->toStream(out);
   }
 
@@ -448,9 +449,9 @@ inline NodeBuilder<nchild_thresh>::NodeBuilder(const NodeBuilder<N>& nb) :
 
   if(nb.d_nv->d_nchildren > nchild_thresh) {
     realloc(nb.d_size, false);
-    std::copy(nb.d_nv->ev_begin(), nb.d_nv->ev_end(), d_nv->nv_begin());
+    std::copy(nb.d_nv->nv_begin(), nb.d_nv->nv_end(), d_nv->nv_begin());
   } else {
-    std::copy(nb.d_nv->ev_begin(), nb.d_nv->ev_end(), d_inlineNv.nv_begin());
+    std::copy(nb.d_nv->nv_begin(), nb.d_nv->nv_end(), d_inlineNv.nv_begin());
   }
   d_nv->d_kind = nb.d_nv->d_kind;
   d_nv->d_nchildren = nb.d_nv->d_nchildren;
@@ -648,6 +649,7 @@ NodeBuilder<nchild_thresh>::operator Node() {// not const
 template <unsigned nchild_thresh>
 inline std::ostream& operator<<(std::ostream& out,
                                 const NodeBuilder<nchild_thresh>& b) {
+
   b.toStream(out);
   return out;
 }
diff --git a/test/unit/Makefile.am b/test/unit/Makefile.am
index 591a85202..9fba9f7ff 100644
--- a/test/unit/Makefile.am
+++ b/test/unit/Makefile.am
@@ -2,6 +2,8 @@
 UNIT_TESTS = \
 	expr/node_white \
 	expr/node_black \
+	expr/kind_black \
+	expr/node_builder_black \
 	parser/parser_black \
 	context/context_black \
 	context/context_mm_black \
diff --git a/test/unit/expr/kind_black.h b/test/unit/expr/kind_black.h
new file mode 100644
index 000000000..35c5fde16
--- /dev/null
+++ b/test/unit/expr/kind_black.h
@@ -0,0 +1,89 @@
+/*********************                                                        */
+/** kind_black.h
+ ** Original author: taking
+ ** Major contributors: none
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009, 2010  The Analysis of Computer Systems Group (ACSys)
+ ** Courant Institute of Mathematical Sciences
+ ** New York University
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.
+ **
+ ** Black box testing of CVC4::Kind.
+ **/
+
+#include <cxxtest/TestSuite.h>
+
+#include <iostream>
+#include <string>
+#include <sstream>
+
+#include "expr/kind.h"
+
+using namespace CVC4;
+using namespace std;
+
+class KindBlack : public CxxTest::TestSuite {
+  Kind undefined;
+  Kind null;
+  Kind last;
+  
+  //easier to define in setup
+  int beyond;
+  Kind unknown;
+public:
+  void setUp() {
+    undefined = UNDEFINED_KIND;
+    null = NULL_EXPR;
+    last = LAST_KIND;
+    beyond = ((int) LAST_KIND) + 1;
+    unknown = (Kind) beyond;
+  }
+
+  
+  void testEquality(){
+
+    TS_ASSERT_EQUALS(undefined, UNDEFINED_KIND);
+    TS_ASSERT_EQUALS(last, LAST_KIND);
+  }
+  
+  void testOrder(){
+    TS_ASSERT_LESS_THAN(int(undefined), int(null));
+    TS_ASSERT_LESS_THAN(int(null), int(last));
+    TS_ASSERT_LESS_THAN(int(undefined), int(last));
+    TS_ASSERT_LESS_THAN(int(last), int(unknown));
+  }
+
+  bool stringIsAsExpected(Kind k, const char * s){
+    stringstream act;
+    stringstream exp;
+
+    act << k;
+    exp << s;
+    
+    string actCreated = act.str();
+    string expCreated = exp.str();
+    return actCreated == expCreated;
+  }
+
+  void testOperatorLtLt() {
+
+    TS_ASSERT(stringIsAsExpected(undefined, "UNDEFINED_KIND"));
+    TS_ASSERT(stringIsAsExpected(null, "NULL"));
+    TS_ASSERT(stringIsAsExpected(last, "LAST_KIND"));    
+
+  }
+  void testOperatorLtLtConcat() {
+
+    stringstream act, exp;
+    act << undefined << null << last << unknown;
+    exp << "UNDEFINED_KIND" << "NULL" << "LAST_KIND" << "UNKNOWNKIND!"<< beyond;
+    
+    string actCreated = act.str();
+    string expCreated = exp.str();
+    
+    TS_ASSERT_EQUALS(actCreated, expCreated);
+  }
+
+};
diff --git a/test/unit/expr/node_builder_black.h b/test/unit/expr/node_builder_black.h
new file mode 100644
index 000000000..10d761166
--- /dev/null
+++ b/test/unit/expr/node_builder_black.h
@@ -0,0 +1,517 @@
+/*********************                                                        */
+/** node__builder_black.h
+ ** Original author: taking
+ ** Major contributors: none
+ ** Minor contributors (to current version): none
+ ** This file is part of the CVC4 prototype.
+ ** Copyright (c) 2009, 2010  The Analysis of Computer Systems Group (ACSys)
+ ** Courant Institute of Mathematical Sciences
+ ** New York University
+ ** See the file COPYING in the top-level source directory for licensing
+ ** information.
+ **
+ ** Black box testing of CVC4::NodeBuilder.
+ **/
+
+#include <cxxtest/TestSuite.h>
+
+//Used in some of the tests
+#include <vector>
+#include <limits.h>
+#include <sstream>
+
+#include "expr/node_builder.h"
+#include "expr/node_manager.h"
+#include "expr/node.h"
+#include "expr/kind.h"
+
+using namespace CVC4;
+using namespace std;
+
+class NodeBuilderBlack : public CxxTest::TestSuite {
+private:
+
+  NodeManagerScope *d_scope;
+  NodeManager *d_nm;
+
+public:
+
+  void setUp() {
+    d_nm = new NodeManager();
+    d_scope = new NodeManagerScope(d_nm);
+    specKind = PLUS;
+  }
+
+  void tearDown() {
+    delete d_nm;
+    delete d_scope;
+  }
+
+
+  template <unsigned N>
+  void push_back(NodeBuilder<N>& nb, int n){
+    for(int i=0; i<n; ++i){
+      nb << Node::null();
+    }
+  }
+
+#define K 30
+#define LARGE_K UINT_MAX/40
+
+  Kind specKind;
+
+  /**
+   * Tests just constructors. No modification is done to the node.
+   */
+  void testNodeConstructors(){
+
+    //inline NodeBuilder();
+    //inline NodeBuilder(Kind k);
+    //inline NodeBuilder(const NodeBuilder<nchild_thresh>& nb);
+    //template <unsigned N> inline NodeBuilder(const NodeBuilder<N>& nb);
+    //inline NodeBuilder(NodeManager* nm);
+    //inline NodeBuilder(NodeManager* nm, Kind k);
+
+    /* default size tests */
+    NodeBuilder<> def;
+    TS_ASSERT_EQUALS(def.getKind(), UNDEFINED_KIND);
+    TS_ASSERT_EQUALS(def.getNumChildren(), 0);
+    TS_ASSERT_EQUALS(def.begin(), def.end());
+
+    NodeBuilder<> spec(specKind);
+    TS_ASSERT_EQUALS(spec.getKind(), specKind);
+    TS_ASSERT_EQUALS(spec.getNumChildren(), 0);
+    TS_ASSERT_EQUALS(spec.begin(), spec.end());
+
+
+    NodeBuilder<> from_nm(d_nm);
+    TS_ASSERT_EQUALS(from_nm.getKind(), UNDEFINED_KIND);
+    TS_ASSERT_EQUALS(from_nm.getNumChildren(), 0);
+    TS_ASSERT_EQUALS(from_nm.begin(), from_nm.end());
+
+    NodeBuilder<> from_nm_kind(d_nm, specKind);
+    TS_ASSERT_EQUALS(from_nm_kind.getKind(), specKind);
+    TS_ASSERT_EQUALS(from_nm_kind.getNumChildren(), 0);
+    TS_ASSERT_EQUALS(from_nm_kind.begin(), from_nm_kind.end());
+
+
+    /* Non-default size tests */
+
+    NodeBuilder<K> ws;
+    TS_ASSERT_EQUALS(ws.getKind(), UNDEFINED_KIND);
+    TS_ASSERT_EQUALS(ws.getNumChildren(), 0);
+    TS_ASSERT_EQUALS(ws.begin(), ws.end());
+
+    NodeBuilder<K> ws_kind(specKind);
+    TS_ASSERT_EQUALS(ws_kind.getKind(), specKind);
+    TS_ASSERT_EQUALS(ws_kind.getNumChildren(), 0);
+    TS_ASSERT_EQUALS(ws_kind.begin(), ws_kind.end());
+
+
+    NodeBuilder<K> ws_from_nm(d_nm);
+    TS_ASSERT_EQUALS(ws_from_nm.getKind(), UNDEFINED_KIND);
+    TS_ASSERT_EQUALS(ws_from_nm.getNumChildren(), 0);
+    TS_ASSERT_EQUALS(ws_from_nm.begin(), ws_from_nm.end());
+
+    NodeBuilder<K> ws_from_nm_kind(d_nm, specKind);
+    TS_ASSERT_EQUALS(ws_from_nm_kind.getKind(), specKind);
+    TS_ASSERT_EQUALS(ws_from_nm_kind.getNumChildren(), 0);
+    TS_ASSERT_EQUALS(ws_from_nm_kind.begin(), ws_from_nm_kind.end());
+
+
+    /* Extreme size tests */
+    NodeBuilder<0> ws_size_0();
+
+    NodeBuilder<LARGE_K> ws_size_large();
+
+    /* CopyConstructors */
+
+    NodeBuilder<> copy(def);
+    TS_ASSERT_EQUALS(copy.getKind(), UNDEFINED_KIND);
+    TS_ASSERT_EQUALS(copy.getNumChildren(), 0);
+    TS_ASSERT_EQUALS(copy.begin(), copy.end());
+
+    NodeBuilder<K> cp_ws(ws);
+    TS_ASSERT_EQUALS(cp_ws.getKind(), UNDEFINED_KIND);
+    TS_ASSERT_EQUALS(cp_ws.getNumChildren(), 0);
+    TS_ASSERT_EQUALS(cp_ws.begin(), cp_ws.end());
+
+
+    NodeBuilder<K-10> cp_from_larger(ws);
+    TS_ASSERT_EQUALS(cp_from_larger.getKind(), UNDEFINED_KIND);
+    TS_ASSERT_EQUALS(cp_from_larger.getNumChildren(), 0);
+    TS_ASSERT_EQUALS(cp_from_larger.begin(), cp_from_larger.end());
+
+    NodeBuilder<K+10> cp_from_smaller(ws);
+    TS_ASSERT_EQUALS(cp_from_smaller.getKind(), UNDEFINED_KIND);
+    TS_ASSERT_EQUALS(cp_from_smaller.getNumChildren(), 0);
+    TS_ASSERT_EQUALS(cp_from_smaller.begin(), cp_from_smaller.end());
+
+  }
+
+  void testDestructor(){
+    //inline ~NodeBuilder();
+    NodeBuilder<K>* nb = new NodeBuilder<K>();
+    delete nb;
+    //Not sure what to test other than survival
+  }
+
+  void testBeginEnd(){
+    /* Test begin and ends without resizing */
+    NodeBuilder<K> ws;
+    TS_ASSERT_EQUALS(ws.begin(), ws.end());
+
+    push_back(ws, K);
+    TS_ASSERT_DIFFERS(ws.begin(), ws.end());
+
+    NodeBuilder<K>::iterator iter = ws.begin();
+    for(int i = 0; i < K; ++i){
+      TS_ASSERT_DIFFERS(iter, ws.end());
+      ++iter;
+    }
+    TS_ASSERT_EQUALS(iter, ws.end());
+
+    NodeBuilder<K>::const_iterator citer = ws.begin();
+    for(int i = 0; i < K; ++i){
+      TS_ASSERT_DIFFERS(citer, ws.end());
+      ++citer;
+    }
+    TS_ASSERT_EQUALS(citer, ws.end());
+
+    /* Do the same tests and make sure that resizing occurs */
+
+    NodeBuilder<> smaller;
+    TS_ASSERT_EQUALS(smaller.begin(), smaller.end());
+
+    push_back(smaller, K);
+    TS_ASSERT_DIFFERS(smaller.begin(), smaller.end());
+
+    NodeBuilder<>::iterator smaller_iter = smaller.begin();
+    for(int i = 0; i < K; ++i){
+      TS_ASSERT_DIFFERS(smaller_iter, smaller.end());
+      ++smaller_iter;
+    }
+    TS_ASSERT_EQUALS(iter, ws.end());
+
+    NodeBuilder<>::const_iterator smaller_citer = smaller.begin();
+    for(int i = 0; i < K; ++i){
+      TS_ASSERT_DIFFERS(smaller_citer, smaller.end());
+      ++smaller_citer;
+    }
+    TS_ASSERT_EQUALS(smaller_citer, smaller.end());
+  }
+
+  void testIterator(){
+    TS_WARN( "TODO: This test still needs to be written!" );
+  }
+
+  void testGetKind(){
+    /*  Kind getKind() const; */
+    NodeBuilder<> noKind;
+    TS_ASSERT_EQUALS(noKind.getKind(), UNDEFINED_KIND);
+    push_back(noKind, K);
+    TS_ASSERT_EQUALS(noKind.getKind(), UNDEFINED_KIND);
+
+    noKind << specKind;
+    TS_ASSERT_EQUALS(noKind.getKind(), specKind);
+
+    Node n = noKind;
+
+    TS_ASSERT_THROWS_ANYTHING(noKind.getKind(););
+
+
+
+    NodeBuilder<> spec(specKind);
+    TS_ASSERT_EQUALS(spec.getKind(), specKind);
+    push_back(spec, K);
+    TS_ASSERT_EQUALS(spec.getKind(), specKind);
+
+  }
+
+  void testGetNumChildren(){
+    /* unsigned getNumChildren() const; */
+
+    NodeBuilder<> noKind;
+    TS_ASSERT_EQUALS(noKind.getNumChildren(), 0);
+    push_back(noKind, K);
+
+    TS_ASSERT_EQUALS(noKind.getNumChildren(), K);
+
+    push_back(noKind, K);
+    TS_ASSERT_EQUALS(noKind.getNumChildren(), K+K);
+
+    noKind.clear();
+    TS_ASSERT_EQUALS(noKind.getNumChildren(), 0);
+    push_back(noKind, K);
+
+    TS_ASSERT_EQUALS(noKind.getNumChildren(), K);
+
+    push_back(noKind, K);
+    TS_ASSERT_EQUALS(noKind.getNumChildren(), K+K);
+
+
+    noKind << specKind;
+    Node n = noKind;
+    TS_ASSERT_THROWS_ANYTHING(noKind.getNumChildren(););
+  }
+
+  void testOperatorSquare(){
+    /*
+      Node operator[](int i) const {
+      Assert(i >= 0 && i < d_ev->getNumChildren());
+      return Node(d_ev->d_children[i]);
+      }
+    */
+    NodeBuilder<> arr(specKind);
+
+    Node i_0 = d_nm->mkNode(FALSE);
+    Node i_2 = d_nm->mkNode(TRUE);
+    Node i_K = d_nm->mkNode(NOT);
+
+
+    TS_ASSERT_THROWS_ANYTHING(arr[-1];);
+    TS_ASSERT_THROWS_ANYTHING(arr[0];);
+
+
+    arr << i_0;
+
+    TS_ASSERT_EQUALS(arr[0], i_0);
+
+    push_back(arr,1);
+
+    arr << i_2;
+
+    TS_ASSERT_EQUALS(arr[0], i_0);
+    TS_ASSERT_EQUALS(arr[2], i_2);
+
+    push_back(arr, K-3);
+
+    TS_ASSERT_EQUALS(arr[0], i_0);
+    TS_ASSERT_EQUALS(arr[2], i_2);
+    for(int i=3;i<K;++i) TS_ASSERT_EQUALS(arr[i], Node::null());
+
+    arr << i_K;
+
+
+    TS_ASSERT_EQUALS(arr[0], i_0);
+    TS_ASSERT_EQUALS(arr[2], i_2);
+    for(int i=3;i<K;++i) TS_ASSERT_EQUALS(arr[i], Node::null());
+    TS_ASSERT_EQUALS(arr[K], i_K);
+
+    Node n = arr;
+    TS_ASSERT_THROWS_ANYTHING(arr[0];);
+  }
+
+  void testClear(){
+    /* void clear(Kind k = UNDEFINED_KIND); */
+    NodeBuilder<> nb;
+
+    
+    TS_ASSERT_EQUALS(nb.getKind(), UNDEFINED_KIND);
+    TS_ASSERT_EQUALS(nb.getNumChildren(), 0);
+    TS_ASSERT_EQUALS(nb.begin(), nb.end());
+
+    nb << specKind;
+    push_back(nb, K);
+
+    TS_ASSERT_EQUALS(nb.getKind(), specKind);
+    TS_ASSERT_EQUALS(nb.getNumChildren(), K);
+    TS_ASSERT_DIFFERS(nb.begin(), nb.end());
+
+    nb.clear();
+
+    TS_ASSERT_EQUALS(nb.getKind(), UNDEFINED_KIND);
+    TS_ASSERT_EQUALS(nb.getNumChildren(), 0);
+    TS_ASSERT_EQUALS(nb.begin(), nb.end());
+
+    nb << specKind;
+    push_back(nb, K);
+
+    TS_ASSERT_EQUALS(nb.getKind(), specKind);
+    TS_ASSERT_EQUALS(nb.getNumChildren(), K);
+    TS_ASSERT_DIFFERS(nb.begin(), nb.end());
+
+    nb.clear(specKind);
+
+    TS_ASSERT_EQUALS(nb.getKind(), specKind);
+    TS_ASSERT_EQUALS(nb.getNumChildren(), 0);
+    TS_ASSERT_EQUALS(nb.begin(), nb.end());
+
+    push_back(nb, K);
+    Node n = nb;
+    nb.clear();
+
+
+    TS_ASSERT_EQUALS(nb.getKind(), UNDEFINED_KIND);
+    TS_ASSERT_EQUALS(nb.getNumChildren(), 0);
+    TS_ASSERT_EQUALS(nb.begin(), nb.end());
+
+  }
+
+  void testStreamInsertionKind(){
+    /* NodeBuilder& operator<<(const Kind& k); */
+
+    NodeBuilder<> spec(specKind);
+    TS_ASSERT_THROWS_ANYTHING( spec << PLUS; );
+
+    NodeBuilder<> noSpec;
+    noSpec << specKind;
+    TS_ASSERT_EQUALS(noSpec.getKind(), specKind);
+
+
+    NodeBuilder<> modified;
+    push_back(modified, K);
+    modified << specKind;
+    TS_ASSERT_EQUALS(modified.getKind(), specKind);
+
+    NodeBuilder<> nb(specKind);
+    Node n = nb;
+    nb.clear(PLUS);
+    TS_ASSERT_THROWS_ANYTHING(nb << PLUS;);
+
+    NodeBuilder<> testRef;
+    TS_ASSERT_EQUALS((testRef << specKind).getKind(), specKind);
+
+
+    NodeBuilder<> testTwo;
+    TS_ASSERT_THROWS_ANYTHING(testTwo << specKind << PLUS;);
+
+    NodeBuilder<> testMixOrder1;
+    TS_ASSERT_EQUALS((testMixOrder1<< specKind << d_nm->mkNode(TRUE)).getKind(),
+                     specKind);
+    NodeBuilder<> testMixOrder2;
+    TS_ASSERT_EQUALS((testMixOrder2<< d_nm->mkNode(TRUE)<<specKind).getKind(),
+                     specKind);
+  }
+
+  void testStreamInsertionNode(){
+    /* NodeBuilder& operator<<(const Node& n); */
+    NodeBuilder<K> nb(specKind);
+    TS_ASSERT_EQUALS(nb.getKind(), specKind);
+    TS_ASSERT_EQUALS(nb.getNumChildren(), 0);
+    TS_ASSERT_EQUALS(nb.begin(), nb.end());
+    push_back(nb,K);
+    TS_ASSERT_EQUALS(nb.getKind(), specKind);
+    TS_ASSERT_EQUALS(nb.getNumChildren(), K);
+    TS_ASSERT_DIFFERS(nb.begin(), nb.end());
+
+    Node n = nb;
+    TS_ASSERT_THROWS_ANYTHING(nb << n;);
+
+
+    NodeBuilder<> overflow(specKind);
+    TS_ASSERT_EQUALS(overflow.getKind(), specKind);
+    TS_ASSERT_EQUALS(overflow.getNumChildren(), 0);
+    TS_ASSERT_EQUALS(overflow.begin(), overflow.end());
+
+    push_back(overflow,5*K+1);
+
+    TS_ASSERT_EQUALS(overflow.getKind(), specKind);
+    TS_ASSERT_EQUALS(overflow.getNumChildren(), 5*K+1);
+    TS_ASSERT_DIFFERS(overflow.begin(), overflow.end());
+
+  }
+
+  void testAppend(){
+    /*
+      NodeBuilder& append(const Node& n) {
+    Assert(!d_used, "NodeBuilder is one-shot only; tried to access it after conversion");
+    Debug("prop") << "append: " << this << " " << n << "[" << n.d_ev << "]" << std::endl;
+    allocateEvIfNecessaryForAppend();
+    NodeValue* ev = n.d_ev;
+    ev->inc();
+    d_ev->d_children[d_ev->d_nchildren++] = ev;
+    return *this;
+  }
+     */
+    /*
+      
+  template <class Iterator>
+  NodeBuilder& append(const Iterator& begin, const Iterator& end) {
+    Assert(!d_used, "NodeBuilder is one-shot only; tried to access it after conversion");
+    for(Iterator i = begin; i != end; ++i) {
+      append(*i);
+    }
+    return *this;
+  }
+
+    */
+    TS_WARN( "TODO: This test still needs to be written!" );
+  }
+
+  void testOperatorNodeCast(){
+    /* operator Node();*/
+    NodeBuilder<K> implicit(specKind);
+    NodeBuilder<K> explic(specKind);
+
+    push_back(implicit, K);
+    push_back(explic, K);
+
+    Node nimpl = implicit;
+    Node nexplicit = (Node) explic;
+
+    TS_ASSERT_EQUALS(nimpl.getKind(), specKind);
+    TS_ASSERT_EQUALS(nimpl.getNumChildren(), K);
+
+    TS_ASSERT_EQUALS(nexplicit.getKind(), specKind);
+    TS_ASSERT_EQUALS(nexplicit.getNumChildren(), K);
+
+    TS_ASSERT_THROWS_ANYTHING(Node blah = implicit);
+  }
+
+  void testToStream(){
+    /* inline void toStream(std::ostream& out) const {
+       d_ev->toStream(out);
+       }
+     */
+
+    NodeBuilder<K> a(specKind);
+    NodeBuilder<K> b(specKind);
+    NodeBuilder<K> c(TRUE);
+    string astr, bstr, cstr;
+    stringstream astream, bstream, cstream;
+
+    push_back(a,K/2);
+    push_back(b,K/2);
+    push_back(c,K/2);
+
+
+    a.toStream(astream);
+    b.toStream(bstream);
+    c.toStream(cstream);
+
+
+    astr = astream.str();
+    bstr = bstream.str();
+    cstr = cstream.str();
+
+    TS_ASSERT_EQUALS(astr, bstr);
+    TS_ASSERT_DIFFERS(astr, cstr);
+
+
+    a.clear(specKind);
+    b.clear(specKind);
+    c.clear(specKind);
+    astream.flush();
+    bstream.flush();
+    cstream.flush();
+
+
+    push_back(a,2*K);
+    push_back(b,2*K);
+    push_back(c,2*K+1);
+
+
+    a.toStream(astream);
+    b.toStream(bstream);
+    c.toStream(cstream);
+
+
+    astr = astream.str();
+    bstr = bstream.str();
+    cstr = cstream.str();
+
+    TS_ASSERT_EQUALS(astr, bstr);
+    TS_ASSERT_DIFFERS(astr, cstr);
+  }
+};