diff --git a/ConflictSet.cpp b/ConflictSet.cpp
index a9ef1c5..963fca6 100644
--- a/ConflictSet.cpp
+++ b/ConflictSet.cpp
@@ -260,6 +260,18 @@ void lastLeqMulti(Node *root, std::span<Key> keys, Iterator *results) {
   fprintf(file, "}\n");
 }
 
+[[maybe_unused]] Key toKey(int n) {
+  constexpr int kMaxLength = 4;
+  static unsigned char itoaBuf[kMaxLength];
+  int i = kMaxLength;
+  memset(itoaBuf, '0', kMaxLength);
+  do {
+    itoaBuf[--i] = "0123456789abcdef"[n % 16];
+    n /= 16;
+  } while (n);
+  return Key{itoaBuf, kMaxLength};
+}
+
 } // namespace
 
 struct ConflictSet::Impl {
@@ -378,12 +390,13 @@ ConflictSet &ConflictSet::operator=(ConflictSet &&other) noexcept {
 #ifdef ENABLE_TESTS
 int main(void) {
   ConflictSet::Impl cs{0};
-  ConflictSet::WriteRange write;
-  write.begin.p = (const uint8_t *)"0000";
-  write.begin.len = 4;
-  write.end.len = 0;
-  write.writeVersion = 1;
-  cs.addWrites(&write, 1);
+  for (int i = 0; i < 10; ++i) {
+    ConflictSet::WriteRange write;
+    write.begin = toKey(i);
+    write.end.len = 0;
+    write.writeVersion = i;
+    cs.addWrites(&write, 1);
+  }
   debugPrintDot(stdout, cs.root);
 }
 #endif
\ No newline at end of file