Interleave calls for two conflict sets in tests

ConflictSet.cpp

@@ -3928,7 +3928,7 @@ checkMaxVersion(Node *root, Node *node, InternalVersionT oldestVersion,
                 bool &success, ConflictSet::Impl *impl) {
   checkVersionsGeqOldestExtant(node,
                                InternalVersionT(impl->oldestExtantVersion));
-  auto expected = InternalVersionT::zero;
+  auto expected = oldestVersion;
   if (node->entryPresent) {
     expected = std::max(expected, node->entry.pointVersion);
   }
@@ -4151,26 +4151,42 @@ int main(void) { printTree(); }
 
 #ifdef ENABLE_FUZZ
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
-  TestDriver<ConflictSet::Impl> driver{data, size};
+  Arbitrary arbitrary({data, size});
+  TestDriver<ConflictSet::Impl> driver1{arbitrary};
+  TestDriver<ConflictSet::Impl> driver2{arbitrary};
 
+  bool done1 = false;
+  bool done2 = false;
   for (;;) {
-    bool done = driver.next();
-    if (!driver.ok) {
-      debugPrintDot(stdout, driver.cs.root, &driver.cs);
-      fflush(stdout);
-      abort();
+    if (!done1) {
+      done1 = driver1.next();
+      if (!driver1.ok) {
+        debugPrintDot(stdout, driver1.cs.root, &driver1.cs);
+        fflush(stdout);
+        abort();
+      }
+      if (!checkCorrectness(driver1.cs.root, driver1.cs.oldestVersion,
+                            &driver1.cs)) {
+        debugPrintDot(stdout, driver1.cs.root, &driver1.cs);
+        fflush(stdout);
+        abort();
+      }
     }
-#if DEBUG_VERBOSE && !defined(NDEBUG)
-    fprintf(stderr, "Check correctness\n");
-#endif
-    bool success =
-        checkCorrectness(driver.cs.root, driver.cs.oldestVersion, &driver.cs);
-    if (!success) {
-      debugPrintDot(stdout, driver.cs.root, &driver.cs);
-      fflush(stdout);
-      abort();
+    if (!done2) {
+      done2 = driver2.next();
+      if (!driver2.ok) {
+        debugPrintDot(stdout, driver2.cs.root, &driver2.cs);
+        fflush(stdout);
+        abort();
+      }
+      if (!checkCorrectness(driver2.cs.root, driver2.cs.oldestVersion,
+                            &driver2.cs)) {
+        debugPrintDot(stdout, driver2.cs.root, &driver2.cs);
+        fflush(stdout);
+        abort();
+      }
     }
-    if (done) {
+    if (done1 && done2) {
       break;
     }
   }