[2836] Test growth of the mapped segment

Fill the memory image with a lot of records, so the segment must grow.
Currently fails, because the growth is not handled.

src/lib/datasrc/tests/memory/zone_data_updater_unittest.cc

@@ -33,6 +33,7 @@
 #include <gtest/gtest.h>
 
 #include <boost/scoped_ptr.hpp>
+#include <boost/lexical_cast.hpp>
 
 #include <cassert>
 
@@ -56,6 +57,16 @@ public:
     virtual void cleanup() const {};
 };
 
+ZoneNode*
+getNode(isc::util::MemorySegment& mem_sgmt, const Name& name,
+        ZoneData* zone_data)
+{
+    ZoneNode* node = NULL;
+    zone_data->insertName(mem_sgmt, name, &node);
+    EXPECT_NE(static_cast<ZoneNode*>(NULL), node);
+    return (node);
+}
+
 class ZoneDataUpdaterTest : public ::testing::TestWithParam<SegmentCreator*> {
 protected:
     ZoneDataUpdaterTest() :
@@ -149,16 +160,6 @@ TEST_P(ZoneDataUpdaterTest, bothNull) {
                  ZoneDataUpdater::NullRRset);
 }
 
-ZoneNode*
-getNode(isc::util::MemorySegment& mem_sgmt, const Name& name,
-        ZoneData* zone_data)
-{
-    ZoneNode* node = NULL;
-    zone_data->insertName(mem_sgmt, name, &node);
-    EXPECT_NE(static_cast<ZoneNode*>(NULL), node);
-    return (node);
-}
-
 TEST_P(ZoneDataUpdaterTest, zoneMinTTL) {
     // If we add SOA, zone's min TTL will be updated.
     updater_->add(textToRRset(
@@ -286,4 +287,29 @@ TEST_P(ZoneDataUpdaterTest, rrsigForNSEC3Only) {
                  isc::NotImplemented);
 }
 
+// Generate many small RRsets. This tests that the underlying memory segment
+// can grow during the execution and that the updater handles that well.
+//
+// Some of the grows will happen inserting the RRSIG, some with the TXT.
+TEST_P(ZoneDataUpdaterTest, manySmallRRsets) {
+    for (size_t i = 0; i < 32768; ++i) {
+        const std::string name(boost::lexical_cast<std::string>(i) +
+                               ".example.org.");
+        updater_->add(textToRRset(name + " 3600 IN TXT " +
+                                  std::string(30, 'X')),
+                      textToRRset(name + " 3600 IN RRSIG TXT 5 3 3600 "
+                                  "20150420235959 20051021000000 1 "
+                                  "example.org. FAKE"));
+        ZoneNode* node = getNode(*mem_sgmt_,
+                                 Name(boost::lexical_cast<std::string>(i) +
+                                      ".example.org"), zone_data_);
+        const RdataSet* rdset = node->getData();
+        ASSERT_NE(static_cast<RdataSet*>(NULL), rdset);
+        rdset = RdataSet::find(rdset, RRType::TXT(), true);
+        ASSERT_NE(static_cast<RdataSet*>(NULL), rdset);
+        EXPECT_EQ(1, rdset->getRdataCount());
+        EXPECT_EQ(1, rdset->getSigRdataCount());
+    }
+}
+
 }