diff --git a/dev/tests/chunks.lua b/dev/tests/chunks.lua
new file mode 100644
index 00000000..dbc001ba
--- /dev/null
+++ b/dev/tests/chunks.lua
@@ -0,0 +1,27 @@
+test.set_setting("chunks.load-distance", 3)
+test.set_setting("chunks.load-speed", 1)
+
+test.reconfig_packs({"base"}, {})
+test.new_world("demo", "2019", "core:default")
+
+local pid1 = player.create("Xerxes")
+assert(player.get_name(pid1) == "Xerxes")
+
+local pid2 = player.create("Segfault")
+assert(player.get_name(pid2) == "Segfault")
+
+local seed = math.floor(math.random() * 1e6)
+print("random seed", seed)
+math.randomseed(seed)
+
+for i=1,25 do
+    if i % 5 == 0 then
+        print(tostring(i*4).." % done")
+        print("chunks loaded", world.count_chunks())
+    end
+    player.set_pos(pid1, math.random() * 100 - 50, 100, math.random() * 100 - 50)
+    player.set_pos(pid2, math.random() * 200 - 100, 100, math.random() * 200 - 100)
+    test.tick()
+end
+
+test.close_world(true)
diff --git a/dev/tests/example.lua b/dev/tests/example.lua
index 89302aa4..e69de29b 100644
--- a/dev/tests/example.lua
+++ b/dev/tests/example.lua
@@ -1,21 +0,0 @@
-test.set_setting("chunks.load-distance", 3)
-test.set_setting("chunks.load-speed", 1)
-
-test.reconfig_packs({"base"}, {})
-test.new_world("demo", "2019", "core:default")
-local pid1 = player.create("Xerxes")
-assert(player.get_name(pid) == "Xerxes")
-
-local pid2 = player.create("Undefined")
-
-for i=1,100 do
-    if i % 10 == 0 then
-        print(tostring(i).." % done")
-        print("chunks loaded", world.count_chunks())
-    end
-    player.set_pos(pid1, math.random() * 100 - 50, 100, math.random() * 100 - 50)
-    player.set_pos(pid2, math.random() * 200 - 100, 100, math.random() * 200 - 100)
-    test.tick()
-end
-
-test.close_world(true)
diff --git a/res/scripts/stdlib.lua b/res/scripts/stdlib.lua
index 9ddda13c..aa56bc31 100644
--- a/res/scripts/stdlib.lua
+++ b/res/scripts/stdlib.lua
@@ -29,6 +29,7 @@ if test then
     test.open_world = core.open_world
     test.close_world = core.close_world
     test.reopen_world = core.reopen_world
+    test.delete_world = core.delete_world
     test.reconfig_packs = core.reconfig_packs
     test.set_setting = core.set_setting
     test.tick = coroutine.yield
diff --git a/src/ServerMainloop.cpp b/src/ServerMainloop.cpp
index 3d05f55b..559196c6 100644
--- a/src/ServerMainloop.cpp
+++ b/src/ServerMainloop.cpp
@@ -37,9 +37,9 @@ void ServerMainloop::run() {
     logger.info() << "starting test " << coreParams.scriptFile;
     auto process = scripting::start_coroutine(coreParams.scriptFile);
 
-    double targetDelta = 1.0f / static_cast<float>(TPS);
+    double targetDelta = 1.0 / static_cast<double>(TPS);
     double delta = targetDelta;
-    auto begin = steady_clock::now();
+    auto begin = system_clock::now();
     while (process->isActive()) {
         if (engine.isQuitSignal()) {
             process->terminate();
@@ -49,16 +49,15 @@ void ServerMainloop::run() {
         time.step(delta);
         process->update();
         if (controller) {
-            float delta = time.getDelta();
             controller->getLevel()->getWorld()->updateTimers(delta);
-            controller->update(glm::min(delta, 0.2f), false);
+            controller->update(glm::min(delta, 0.2), false);
         }
 
         if (!coreParams.testMode) {
-            auto end = steady_clock::now();
+            auto end = system_clock::now();
             platform::sleep(targetDelta * 1000 - 
                 duration_cast<microseconds>(end - begin).count() / 1000);
-            end = steady_clock::now();
+            end = system_clock::now();
             delta = duration_cast<microseconds>(end - begin).count() / 1e6;
             begin = end;
         }
diff --git a/vctest/main.cpp b/vctest/main.cpp
index 7757041e..86e61553 100644
--- a/vctest/main.cpp
+++ b/vctest/main.cpp
@@ -117,8 +117,10 @@ static void setup_working_dir(const fs::path& workingDir) {
     fs::create_directories(dir);
 }
 
-static void display_test_output(const fs::path& path, std::ostream& stream) {
-    stream << "[OUTPUT]" << std::endl;
+static void display_test_output(
+    const fs::path& path, const fs::path& name, std::ostream& stream
+) {
+    stream << "[OUTPUT] " << name << std::endl;
     if (fs::exists(path)) {
         std::ifstream t(path);
         stream << t.rdbuf();
@@ -160,13 +162,13 @@ static bool run_test(const Config& config, const fs::path& path) {
             .count();
 
     if (code) {
-        display_test_output(outputFile, std::cerr);
+        display_test_output(outputFile, name, std::cerr);
         std::cerr << "[FAILED] " << name << " in " << testTime << " ms" << std::endl;
         fs::remove(outputFile);
         return false;
     } else {
         if (config.outputAlways) {
-            display_test_output(outputFile, std::cout);
+            display_test_output(outputFile, name, std::cout);
         }
         std::cout << "[PASSED] " << name << " in " << testTime << " ms" << std::endl;
         fs::remove(outputFile);