diff -r b873350e6258 -r 8d281761dea4 test/lp_test.cc
--- a/test/lp_test.cc	Thu Jan 19 15:25:06 2012 +0100
+++ b/test/lp_test.cc	Sat May 05 10:22:44 2012 +0200
@@ -41,11 +41,38 @@
 
 using namespace lemon;
 
+int countCols(LpBase & lp) {
+  int count=0;
+  for (LpBase::ColIt c(lp); c!=INVALID; ++c) ++count;
+  return count;
+}
+
+int countRows(LpBase & lp) {
+  int count=0;
+  for (LpBase::RowIt r(lp); r!=INVALID; ++r) ++count;
+  return count;
+}
+
+
 void lpTest(LpSolver& lp)
 {
 
   typedef LpSolver LP;
 
+  // Test LpBase::clear()
+  check(countRows(lp)==0, "Wrong number of rows");
+  check(countCols(lp)==0, "Wrong number of cols");
+  lp.addCol(); lp.addRow(); lp.addRow();
+  check(countRows(lp)==2, "Wrong number of rows");
+  check(countCols(lp)==1, "Wrong number of cols");
+  lp.clear();
+  check(countRows(lp)==0, "Wrong number of rows");
+  check(countCols(lp)==0, "Wrong number of cols");
+  lp.addCol(); lp.addCol(); lp.addCol(); lp.addRow();
+  check(countRows(lp)==1, "Wrong number of rows");
+  check(countCols(lp)==3, "Wrong number of cols");
+  lp.clear();
+
   std::vector<LP::Col> x(10);
   //  for(int i=0;i<10;i++) x.push_back(lp.addCol());
   lp.addColSet(x);