diff --git a/src/test/dbwrapper_tests.cpp b/src/test/dbwrapper_tests.cpp
--- a/src/test/dbwrapper_tests.cpp
+++ b/src/test/dbwrapper_tests.cpp
@@ -207,14 +207,22 @@
     for (int x = 0x00; x < 256; ++x) {
         uint8_t key = x;
         uint32_t value = x * x;
-        BOOST_CHECK(dbw.Write(key, value));
+        if (!(x & 1)) BOOST_CHECK(dbw.Write(key, value));
     }
 
+    // Check that creating an iterator creates a snapshot
     std::unique_ptr<CDBIterator> it(
         const_cast<CDBWrapper &>(dbw).NewIterator());
+
+    for (int x = 0x00; x < 256; ++x) {
+        uint8_t key = x;
+        uint32_t value = x * x;
+        if (x & 1) BOOST_CHECK(dbw.Write(key, value));
+    }
+
     for (int seek_start : {0x00, 0x80}) {
         it->Seek((uint8_t)seek_start);
-        for (int x = seek_start; x < 256; ++x) {
+        for (int x = seek_start; x < 255; ++x) {
             uint8_t key;
             uint32_t value;
             BOOST_CHECK(it->Valid());
@@ -222,6 +230,10 @@
             // case of failure
             if (!it->Valid()) break;
             BOOST_CHECK(it->GetKey(key));
+            if (x & 1) {
+                BOOST_CHECK_EQUAL(key, x + 1);
+                continue;
+            }
             BOOST_CHECK(it->GetValue(value));
             BOOST_CHECK_EQUAL(key, x);
             BOOST_CHECK_EQUAL(value, x * x);