diff --git a/tests/dibi/Connection.connect.phpt b/tests/dibi/Connection.connect.phpt
index 2582558e5..fbc7501a1 100644
--- a/tests/dibi/Connection.connect.phpt
+++ b/tests/dibi/Connection.connect.phpt
@@ -12,7 +12,7 @@ use Tester\Assert;
 require __DIR__ . '/bootstrap.php';
 
 
-test(function () use ($config) {
+test('', function () use ($config) {
 	$conn = new Connection($config);
 	Assert::true($conn->isConnected());
 
@@ -21,7 +21,7 @@ test(function () use ($config) {
 });
 
 
-test(function () use ($config) { // lazy
+test('lazy', function () use ($config) {
 	$conn = new Connection($config + ['lazy' => true]);
 	Assert::false($conn->isConnected());
 
@@ -30,7 +30,7 @@ test(function () use ($config) { // lazy
 });
 
 
-test(function () use ($config) {
+test('', function () use ($config) {
 	$conn = new Connection($config);
 	Assert::true($conn->isConnected());
 
@@ -40,7 +40,7 @@ test(function () use ($config) {
 });
 
 
-test(function () use ($config) {
+test('', function () use ($config) {
 	$conn = new Connection($config);
 	Assert::true($conn->isConnected());
 
@@ -52,7 +52,7 @@ test(function () use ($config) {
 });
 
 
-test(function () use ($config) {
+test('', function () use ($config) {
 	$conn = new Connection($config);
 	Assert::equal('hello', $conn->query('SELECT %s', 'hello')->fetchSingle());
 
@@ -63,7 +63,7 @@ test(function () use ($config) {
 });
 
 
-test(function () use ($config) {
+test('', function () use ($config) {
 	Assert::exception(function () use ($config) {
 		new Connection($config + ['onConnect' => '']);
 	}, InvalidArgumentException::class, "Configuration option 'onConnect' must be array.");
diff --git a/tests/dibi/PdoDriver.providedConnection.phpt b/tests/dibi/PdoDriver.providedConnection.phpt
index 6f2ba007e..f9364ee3d 100644
--- a/tests/dibi/PdoDriver.providedConnection.phpt
+++ b/tests/dibi/PdoDriver.providedConnection.phpt
@@ -29,13 +29,11 @@ Assert::exception(function () {
 }, Dibi\DriverException::class, 'PDO connection in exception or warning error mode is not supported.');
 
 
-// PDO error mode: explicitly set silent
-test(function () {
+test('PDO error mode: explicitly set silent', function () {
 	buildPdoDriver(PDO::ERRMODE_SILENT);
 });
 
 
-// PDO error mode: implicitly set silent
-test(function () {
+test('PDO error mode: implicitly set silent', function () {
 	buildPdoDriver(null);
 });
diff --git a/tests/dibi/Result.normalize.phpt b/tests/dibi/Result.normalize.phpt
index 09e1ca31c..3e00f0400 100644
--- a/tests/dibi/Result.normalize.phpt
+++ b/tests/dibi/Result.normalize.phpt
@@ -24,7 +24,7 @@ class MockResult extends Dibi\Result
 }
 
 
-test(function () {
+test('', function () {
 	$result = new MockResult;
 	$result->setType('col', Type::BOOL);
 
@@ -46,7 +46,7 @@ test(function () {
 });
 
 
-test(function () {
+test('', function () {
 	$result = new MockResult;
 	$result->setType('col', Type::TEXT);
 
@@ -62,7 +62,7 @@ test(function () {
 });
 
 
-test(function () {
+test('', function () {
 	$result = new MockResult;
 	$result->setType('col', Type::FLOAT);
 
@@ -139,7 +139,7 @@ test(function () {
 });
 
 
-test(function () {
+test('', function () {
 	$result = new MockResult;
 	$result->setType('col', Type::INTEGER);
 
@@ -165,7 +165,7 @@ test(function () {
 });
 
 
-test(function () {
+test('', function () {
 	$result = new MockResult;
 	$result->setType('col', Type::DATETIME);
 
@@ -183,7 +183,7 @@ test(function () {
 });
 
 
-test(function () {
+test('', function () {
 	$result = new MockResult;
 	$result->setType('col', Type::DATETIME);
 	$result->setFormat(Type::DATETIME, 'Y-m-d H:i:s');
@@ -202,7 +202,7 @@ test(function () {
 });
 
 
-test(function () {
+test('', function () {
 	$result = new MockResult;
 	$result->setType('col', Type::DATE);
 
@@ -218,7 +218,7 @@ test(function () {
 });
 
 
-test(function () {
+test('', function () {
 	$result = new MockResult;
 	$result->setType('col', Type::TIME);
 
diff --git a/tests/dibi/bootstrap.php b/tests/dibi/bootstrap.php
index a26588dfa..ea3f6fc6e 100644
--- a/tests/dibi/bootstrap.php
+++ b/tests/dibi/bootstrap.php
@@ -37,7 +37,7 @@
 }
 
 
-function test(Closure $function)
+function test(string $title, Closure $function): void
 {
 	$function();
 }