diff --git a/.travis.yml b/.travis.yml
index ddf708af8..c2e0eff61 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,5 @@
 language: php
 php:
-    - 5.4
-    - 5.5
     - 5.6
     - 7.0
     - hhvm
@@ -12,7 +10,7 @@ matrix:
         - php: hhvm
 
     include:
-        - php: 5.5
+        - php: 5.6
           env: dependencies="--prefer-lowest --prefer-stable"
 
 script:
diff --git a/composer.json b/composer.json
index 6761881b0..f145a3f30 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
 		}
 	],
 	"require": {
-		"php": ">=5.4.4",
+		"php": ">=5.6.0",
 		"nette/component-model": "~2.2",
 		"nette/http": "~2.2",
 		"nette/utils": "~2.2"
diff --git a/src/Bridges/FormsLatte/Runtime.php b/src/Bridges/FormsLatte/Runtime.php
index 18ed2c5ae..c155bca5d 100644
--- a/src/Bridges/FormsLatte/Runtime.php
+++ b/src/Bridges/FormsLatte/Runtime.php
@@ -56,13 +56,13 @@ public static function renderFormEnd(Form $form, $withTags = TRUE)
 			}
 		}
 
-		foreach ($form->getComponents(TRUE, 'Nette\Forms\Controls\HiddenField') as $control) {
+		foreach ($form->getComponents(TRUE, Nette\Forms\Controls\HiddenField::class) as $control) {
 			if (!$control->getOption('rendered')) {
 				$s .= $control->getControl();
 			}
 		}
 
-		if (iterator_count($form->getComponents(TRUE, 'Nette\Forms\Controls\TextInput')) < 2) {
+		if (iterator_count($form->getComponents(TRUE, Nette\Forms\Controls\TextInput::class)) < 2) {
 			$s .= "<!--[if IE]><input type=IEbug disabled style=\"display:none\"><![endif]-->\n";
 		}
 
diff --git a/src/Forms/Container.php b/src/Forms/Container.php
index cb08b8720..d7da524fe 100644
--- a/src/Forms/Container.php
+++ b/src/Forms/Container.php
@@ -207,7 +207,7 @@ public function addComponent(Nette\ComponentModel\IComponent $component, $name,
 	 */
 	public function getControls()
 	{
-		return $this->getComponents(TRUE, 'Nette\Forms\IControl');
+		return $this->getComponents(TRUE, IControl::class);
 	}
 
 
@@ -218,7 +218,7 @@ public function getControls()
 	 */
 	public function getForm($need = TRUE)
 	{
-		return $this->lookup('Nette\Forms\Form', $need);
+		return $this->lookup(Form::class, $need);
 	}
 
 
diff --git a/src/Forms/Controls/BaseControl.php b/src/Forms/Controls/BaseControl.php
index 02c4c1a7a..219eca054 100644
--- a/src/Forms/Controls/BaseControl.php
+++ b/src/Forms/Controls/BaseControl.php
@@ -75,7 +75,7 @@ abstract class BaseControl extends Nette\ComponentModel\Component implements ICo
 	 */
 	public function __construct($caption = NULL)
 	{
-		$this->monitor('Nette\Forms\Form');
+		$this->monitor(Form::class);
 		parent::__construct();
 		$this->control = Html::el('input', ['type' => NULL, 'name' => NULL]);
 		$this->label = Html::el('label');
@@ -105,7 +105,7 @@ protected function attached($form)
 	 */
 	public function getForm($need = TRUE)
 	{
-		return $this->lookup('Nette\Forms\Form', $need);
+		return $this->lookup(Form::class, $need);
 	}
 
 
@@ -135,7 +135,7 @@ public function getHttpData($type, $htmlTail = NULL)
 	 */
 	public function getHtmlName()
 	{
-		return Nette\Forms\Helpers::generateHtmlName($this->lookupPath('Nette\Forms\Form'));
+		return Nette\Forms\Helpers::generateHtmlName($this->lookupPath(Form::class));
 	}
 
 
diff --git a/src/Forms/Controls/CsrfProtection.php b/src/Forms/Controls/CsrfProtection.php
index fbd4700d0..b4ab09390 100644
--- a/src/Forms/Controls/CsrfProtection.php
+++ b/src/Forms/Controls/CsrfProtection.php
@@ -29,7 +29,7 @@ public function __construct($message)
 	{
 		parent::__construct();
 		$this->setOmitted()->addRule(self::PROTECTION, $message);
-		$this->monitor('Nette\Application\UI\Presenter');
+		$this->monitor(Nette\Application\UI\Presenter::class);
 	}
 
 
diff --git a/src/Forms/Controls/HiddenField.php b/src/Forms/Controls/HiddenField.php
index 276a2dcf9..8e4e641dd 100644
--- a/src/Forms/Controls/HiddenField.php
+++ b/src/Forms/Controls/HiddenField.php
@@ -24,7 +24,7 @@ public function __construct($persistentValue = NULL)
 		parent::__construct();
 		$this->control->type = 'hidden';
 		if ($persistentValue !== NULL) {
-			$this->unmonitor('Nette\Forms\Form');
+			$this->unmonitor(Nette\Forms\Form::class);
 			$this->persistValue = TRUE;
 			$this->value = (string) $persistentValue;
 		}
diff --git a/src/Forms/Controls/SubmitButton.php b/src/Forms/Controls/SubmitButton.php
index b6d0a8676..3efd12818 100644
--- a/src/Forms/Controls/SubmitButton.php
+++ b/src/Forms/Controls/SubmitButton.php
@@ -112,7 +112,7 @@ public function getControl($caption = NULL)
 	{
 		$scope = [];
 		foreach ((array) $this->validationScope as $control) {
-			$scope[] = $control->lookupPath('Nette\Forms\Form');
+			$scope[] = $control->lookupPath(Nette\Forms\Form::class);
 		}
 		return parent::getControl($caption)->addAttributes([
 			'formnovalidate' => $this->validationScope !== NULL,
diff --git a/src/Forms/Rendering/DefaultFormRenderer.php b/src/Forms/Rendering/DefaultFormRenderer.php
index 79893a978..48f2624de 100644
--- a/src/Forms/Rendering/DefaultFormRenderer.php
+++ b/src/Forms/Rendering/DefaultFormRenderer.php
@@ -193,7 +193,7 @@ public function renderEnd()
 				$s .= $control->getControl();
 			}
 		}
-		if (iterator_count($this->form->getComponents(TRUE, 'Nette\Forms\Controls\TextInput')) < 2) {
+		if (iterator_count($this->form->getComponents(TRUE, Nette\Forms\Controls\TextInput::class)) < 2) {
 			$s .= '<!--[if IE]><input type=IEbug disabled style="display:none"><![endif]-->';
 		}
 		if ($s) {
diff --git a/tests/Forms.DI/FormsExtension.phpt b/tests/Forms.DI/FormsExtension.phpt
index f7bba2d16..5679928e7 100644
--- a/tests/Forms.DI/FormsExtension.phpt
+++ b/tests/Forms.DI/FormsExtension.phpt
@@ -49,4 +49,4 @@ Assert::exception(function () {
 	', 'neon'));
 
 	eval($compiler->compile($config, 'Container2'));
-}, 'Nette\InvalidArgumentException', 'Constant Nette\Forms\Form::Foo\Bar or constant Foo\Bar does not exist.');
+}, Nette\InvalidArgumentException::class, 'Constant Nette\Forms\Form::Foo\Bar or constant Foo\Bar does not exist.');
diff --git a/tests/Forms.Latte/FormMacros.error.phpt b/tests/Forms.Latte/FormMacros.error.phpt
index a91b98a3e..c02c79641 100644
--- a/tests/Forms.Latte/FormMacros.error.phpt
+++ b/tests/Forms.Latte/FormMacros.error.phpt
@@ -18,34 +18,34 @@ FormMacros::install($latte->getCompiler());
 
 Assert::exception(function () use ($latte) {
 	$latte->compile('<form n:form></form>');
-}, 'Latte\CompileException', 'Did you mean <form n:name=...> ?');
+}, Latte\CompileException::class, 'Did you mean <form n:name=...> ?');
 
 Assert::exception(function () use ($latte) {
 	$latte->compile('<form n:name></form>');
-}, 'Latte\CompileException', 'Missing name in n:name.');
+}, Latte\CompileException::class, 'Missing name in n:name.');
 
 Assert::exception(function () use ($latte) {
 	$latte->compile('<form n:inner-name></form>');
-}, 'Latte\CompileException', 'Unknown attribute n:inner-name, use n:name attribute.');
+}, Latte\CompileException::class, 'Unknown attribute n:inner-name, use n:name attribute.');
 
 
 Assert::exception(function () use ($latte) {
 	$latte->compile('<html>{form /}');
-}, 'Latte\CompileException', 'Missing form name in {form}.');
+}, Latte\CompileException::class, 'Missing form name in {form}.');
 
 Assert::exception(function () use ($latte) {
 	$latte->compile('<html>{formContainer /}');
-}, 'Latte\CompileException', 'Missing name in {formContainer}.');
+}, Latte\CompileException::class, 'Missing name in {formContainer}.');
 
 
 Assert::exception(function () use ($latte) {
 	$latte->compile('<html>{label /}');
-}, 'Latte\CompileException', 'Missing name in {label}.');
+}, Latte\CompileException::class, 'Missing name in {label}.');
 
 Assert::exception(function () use ($latte) {
 	$latte->compile('<html>{input /}');
-}, 'Latte\CompileException', 'Missing name in {input}.');
+}, Latte\CompileException::class, 'Missing name in {input}.');
 
 Assert::exception(function () use ($latte) {
 	$latte->compile('<html>{name /}');
-}, 'Latte\CompileException', 'Unknown macro {name}, use n:name attribute.');
+}, Latte\CompileException::class, 'Unknown macro {name}, use n:name attribute.');
diff --git a/tests/Forms/Controls.Button.render.phpt b/tests/Forms/Controls.Button.render.phpt
index 9f4faa5a7..cbe952ba9 100644
--- a/tests/Forms/Controls.Button.render.phpt
+++ b/tests/Forms/Controls.Button.render.phpt
@@ -26,7 +26,7 @@ test(function () {
 	$input = $form->addButton('button', 'Caption');
 
 	Assert::null($input->getLabel());
-	Assert::type('Nette\Utils\Html', $input->getControl());
+	Assert::type(Nette\Utils\Html::class, $input->getControl());
 	Assert::same('<input type="button" name="button" value="Caption">', (string) $input->getControl());
 	Assert::same('<input type="button" name="button" value="Another caption">', (string) $input->getControl('Another caption'));
 });
@@ -74,7 +74,7 @@ test(function () { // SubmitButton
 	$input = $form->addSubmit('button', 'Caption');
 
 	Assert::null($input->getLabel());
-	Assert::type('Nette\Utils\Html', $input->getControl());
+	Assert::type(Nette\Utils\Html::class, $input->getControl());
 	Assert::same('<input type="submit" name="button" value="Caption">', (string) $input->getControl());
 	Assert::same('<input type="submit" name="button" value="Another caption">', (string) $input->getControl('Another caption'));
 });
diff --git a/tests/Forms/Controls.Checkbox.loadData.phpt b/tests/Forms/Controls.Checkbox.loadData.phpt
index c763fa60a..f9919dea5 100644
--- a/tests/Forms/Controls.Checkbox.loadData.phpt
+++ b/tests/Forms/Controls.Checkbox.loadData.phpt
@@ -54,5 +54,5 @@ test(function () { // setValue() and invalid argument
 
 	Assert::exception(function () use ($input) {
 		$input->setValue([]);
-	}, 'Nette\InvalidArgumentException', "Value must be scalar or NULL, array given in field 'checkbox'.");
+	}, Nette\InvalidArgumentException::class, "Value must be scalar or NULL, array given in field 'checkbox'.");
 });
diff --git a/tests/Forms/Controls.Checkbox.render.phpt b/tests/Forms/Controls.Checkbox.render.phpt
index 93e179277..530ab5abe 100644
--- a/tests/Forms/Controls.Checkbox.render.phpt
+++ b/tests/Forms/Controls.Checkbox.render.phpt
@@ -27,13 +27,13 @@ test(function () {
 
 	Assert::null($input->getLabel());
 
-	Assert::type('Nette\Utils\Html', $input->getControl());
+	Assert::type(Nette\Utils\Html::class, $input->getControl());
 	Assert::same('<label for="frm-on"><input type="checkbox" name="on" id="frm-on">Label</label>', (string) $input->getControl());
 
-	Assert::type('Nette\Utils\Html', $input->getLabelPart());
+	Assert::type(Nette\Utils\Html::class, $input->getLabelPart());
 	Assert::same('<label for="frm-on">Label</label>', (string) $input->getLabelPart());
 
-	Assert::type('Nette\Utils\Html', $input->getControlPart());
+	Assert::type(Nette\Utils\Html::class, $input->getControlPart());
 	Assert::same('<input type="checkbox" name="on" id="frm-on">', (string) $input->getControlPart());
 
 	$input->setValue(TRUE);
diff --git a/tests/Forms/Controls.CheckboxList.loadData.phpt b/tests/Forms/Controls.CheckboxList.loadData.phpt
index e55b66c69..29274ef2c 100644
--- a/tests/Forms/Controls.CheckboxList.loadData.phpt
+++ b/tests/Forms/Controls.CheckboxList.loadData.phpt
@@ -136,7 +136,7 @@ test(function () use ($series) { // setValue() and invalid argument
 
 	Assert::exception(function () use ($input) {
 		$input->setValue('unknown');
-	}, 'Nette\InvalidArgumentException', "Value 'unknown' are out of allowed set ['red-dwarf', 'the-simpsons', 0, ''] in field 'list'.");
+	}, Nette\InvalidArgumentException::class, "Value 'unknown' are out of allowed set ['red-dwarf', 'the-simpsons', 0, ''] in field 'list'.");
 });
 
 
diff --git a/tests/Forms/Controls.CheckboxList.render.phpt b/tests/Forms/Controls.CheckboxList.render.phpt
index 342724dd1..b250e855f 100644
--- a/tests/Forms/Controls.CheckboxList.render.phpt
+++ b/tests/Forms/Controls.CheckboxList.render.phpt
@@ -28,17 +28,17 @@ test(function () {
 		0 => 'Second',
 	]);
 
-	Assert::type('Nette\Utils\Html', $input->getLabel());
+	Assert::type(Nette\Utils\Html::class, $input->getLabel());
 	Assert::same('<label>Label</label>', (string) $input->getLabel());
 	Assert::same('<label>Another label</label>', (string) $input->getLabel('Another label'));
 
-	Assert::type('Nette\Utils\Html', $input->getLabelPart(0));
+	Assert::type(Nette\Utils\Html::class, $input->getLabelPart(0));
 	Assert::same('<label for="frm-list-0">Second</label>', (string) $input->getLabelPart(0));
 
 	Assert::type('string', $input->getControl());
 	Assert::same('<label><input type="checkbox" name="list[]" value="a">First</label><br><label><input type="checkbox" name="list[]" value="0">Second</label>', $input->getControl());
 
-	Assert::type('Nette\Utils\Html', $input->getControlPart(0));
+	Assert::type(Nette\Utils\Html::class, $input->getControlPart(0));
 	Assert::same('<input type="checkbox" name="list[]" id="frm-list-0" value="0">', (string) $input->getControlPart(0));
 });
 
diff --git a/tests/Forms/Controls.ChoiceControl.loadData.phpt b/tests/Forms/Controls.ChoiceControl.loadData.phpt
index ab0fe46b7..2cb1aa272 100644
--- a/tests/Forms/Controls.ChoiceControl.loadData.phpt
+++ b/tests/Forms/Controls.ChoiceControl.loadData.phpt
@@ -147,7 +147,7 @@ test(function () use ($series) { // setValue() and invalid argument
 
 	Assert::exception(function () use ($input) {
 		$input->setValue('unknown');
-	}, 'Nette\InvalidArgumentException', "Value 'unknown' is out of allowed set ['red-dwarf', 'the-simpsons', 0, ''] in field 'select'.");
+	}, Nette\InvalidArgumentException::class, "Value 'unknown' is out of allowed set ['red-dwarf', 'the-simpsons', 0, ''] in field 'select'.");
 });
 
 
diff --git a/tests/Forms/Controls.HiddenField.loadData.phpt b/tests/Forms/Controls.HiddenField.loadData.phpt
index 46b33cf50..86779c090 100644
--- a/tests/Forms/Controls.HiddenField.loadData.phpt
+++ b/tests/Forms/Controls.HiddenField.loadData.phpt
@@ -59,7 +59,7 @@ test(function () { // setValue() and invalid argument
 
 	Assert::exception(function () use ($input) {
 		$input->setValue([]);
-	}, 'Nette\InvalidArgumentException', "Value must be scalar or NULL, array given in field 'hidden'.");
+	}, Nette\InvalidArgumentException::class, "Value must be scalar or NULL, array given in field 'hidden'.");
 });
 
 
diff --git a/tests/Forms/Controls.HiddenField.render.phpt b/tests/Forms/Controls.HiddenField.render.phpt
index 7f8147696..c3aea750a 100644
--- a/tests/Forms/Controls.HiddenField.render.phpt
+++ b/tests/Forms/Controls.HiddenField.render.phpt
@@ -26,7 +26,7 @@ test(function () {
 	$input = $form->addHidden('hidden', 'value');
 
 	Assert::null($input->getLabel());
-	Assert::type('Nette\Utils\Html', $input->getControl());
+	Assert::type(Nette\Utils\Html::class, $input->getControl());
 	Assert::same('<input type="hidden" name="hidden" value="value">', (string) $input->getControl());
 });
 
diff --git a/tests/Forms/Controls.ImageButton.render.phpt b/tests/Forms/Controls.ImageButton.render.phpt
index 0df095d22..570c35d83 100644
--- a/tests/Forms/Controls.ImageButton.render.phpt
+++ b/tests/Forms/Controls.ImageButton.render.phpt
@@ -26,7 +26,7 @@ test(function () {
 	$input = $form->addImage('button', 'image.gif');
 
 	Assert::null($input->getLabel());
-	Assert::type('Nette\Utils\Html', $input->getControl());
+	Assert::type(Nette\Utils\Html::class, $input->getControl());
 	Assert::same('<input type="image" name="button[]" src="image.gif">', (string) $input->getControl());
 });
 
diff --git a/tests/Forms/Controls.MultiChoiceControl.loadData.phpt b/tests/Forms/Controls.MultiChoiceControl.loadData.phpt
index 234e0bdde..680ad92fd 100644
--- a/tests/Forms/Controls.MultiChoiceControl.loadData.phpt
+++ b/tests/Forms/Controls.MultiChoiceControl.loadData.phpt
@@ -160,15 +160,15 @@ test(function () use ($series) { // setValue() and invalid argument
 
 	Assert::exception(function () use ($input) {
 		$input->setValue('unknown');
-	}, 'Nette\InvalidArgumentException', "Value 'unknown' are out of allowed set ['red-dwarf', 'the-simpsons', 0, ''] in field 'select'.");
+	}, Nette\InvalidArgumentException::class, "Value 'unknown' are out of allowed set ['red-dwarf', 'the-simpsons', 0, ''] in field 'select'.");
 
 	Assert::exception(function () use ($input) {
 		$input->setValue(new stdClass);
-	}, 'Nette\InvalidArgumentException', "Value must be array or NULL, object given in field 'select'.");
+	}, Nette\InvalidArgumentException::class, "Value must be array or NULL, object given in field 'select'.");
 
 	Assert::exception(function () use ($input) {
 		$input->setValue([new stdClass]);
-	}, 'Nette\InvalidArgumentException', "Values must be scalar, object given in field 'select'.");
+	}, Nette\InvalidArgumentException::class, "Values must be scalar, object given in field 'select'.");
 });
 
 
@@ -181,11 +181,11 @@ test(function () use ($series) { // setValue() and disabled $checkAllowedValues
 
 	Assert::exception(function () use ($input) {
 		$input->setValue(new stdClass);
-	}, 'Nette\InvalidArgumentException', "Value must be array or NULL, object given in field 'select'.");
+	}, Nette\InvalidArgumentException::class, "Value must be array or NULL, object given in field 'select'.");
 
 	Assert::exception(function () use ($input) {
 		$input->setValue([new stdClass]);
-	}, 'Nette\InvalidArgumentException', "Values must be scalar, object given in field 'select'.");
+	}, Nette\InvalidArgumentException::class, "Values must be scalar, object given in field 'select'.");
 });
 
 
diff --git a/tests/Forms/Controls.MultiSelectBox.loadData.phpt b/tests/Forms/Controls.MultiSelectBox.loadData.phpt
index c2f73ee7f..b868ddd7d 100644
--- a/tests/Forms/Controls.MultiSelectBox.loadData.phpt
+++ b/tests/Forms/Controls.MultiSelectBox.loadData.phpt
@@ -199,7 +199,7 @@ test(function () use ($series) { // setValue() and invalid argument
 
 	Assert::exception(function () use ($input) {
 		$input->setValue('unknown');
-	}, 'Nette\InvalidArgumentException', "Value 'unknown' are out of allowed set ['red-dwarf', 'the-simpsons', 0, ''] in field 'select'.");
+	}, Nette\InvalidArgumentException::class, "Value 'unknown' are out of allowed set ['red-dwarf', 'the-simpsons', 0, ''] in field 'select'.");
 });
 
 
diff --git a/tests/Forms/Controls.MultiSelectBox.render.phpt b/tests/Forms/Controls.MultiSelectBox.render.phpt
index 0812987a5..875cecac8 100644
--- a/tests/Forms/Controls.MultiSelectBox.render.phpt
+++ b/tests/Forms/Controls.MultiSelectBox.render.phpt
@@ -28,11 +28,11 @@ test(function () {
 		0 => 'Second',
 	]);
 
-	Assert::type('Nette\Utils\Html', $input->getLabel());
+	Assert::type(Nette\Utils\Html::class, $input->getLabel());
 	Assert::same('<label for="frm-list">Label</label>', (string) $input->getLabel());
 	Assert::same('<label for="frm-list">Another label</label>', (string) $input->getLabel('Another label'));
 
-	Assert::type('Nette\Utils\Html', $input->getControl());
+	Assert::type(Nette\Utils\Html::class, $input->getControl());
 	Assert::same('<select name="list[]" id="frm-list" multiple><option value="a">First</option><option value="0">Second</option></select>', (string) $input->getControl());
 });
 
diff --git a/tests/Forms/Controls.RadioList.loadData.phpt b/tests/Forms/Controls.RadioList.loadData.phpt
index 9c69013d4..36a8a078b 100644
--- a/tests/Forms/Controls.RadioList.loadData.phpt
+++ b/tests/Forms/Controls.RadioList.loadData.phpt
@@ -136,7 +136,7 @@ test(function () use ($series) { // setValue() and invalid argument
 
 	Assert::exception(function () use ($input) {
 		$input->setValue('unknown');
-	}, 'Nette\InvalidArgumentException', "Value 'unknown' is out of allowed set ['red-dwarf', 'the-simpsons', 0, ''] in field 'radio'.");
+	}, Nette\InvalidArgumentException::class, "Value 'unknown' is out of allowed set ['red-dwarf', 'the-simpsons', 0, ''] in field 'radio'.");
 });
 
 
diff --git a/tests/Forms/Controls.RadioList.render.phpt b/tests/Forms/Controls.RadioList.render.phpt
index f77d28bdb..bba23436f 100644
--- a/tests/Forms/Controls.RadioList.render.phpt
+++ b/tests/Forms/Controls.RadioList.render.phpt
@@ -28,17 +28,17 @@ test(function () {
 		0 => 'Second',
 	]);
 
-	Assert::type('Nette\Utils\Html', $input->getLabel());
+	Assert::type(Nette\Utils\Html::class, $input->getLabel());
 	Assert::same('<label>Label</label>', (string) $input->getLabel());
 	Assert::same('<label>Another label</label>', (string) $input->getLabel('Another label'));
 
-	Assert::type('Nette\Utils\Html', $input->getLabelPart(0));
+	Assert::type(Nette\Utils\Html::class, $input->getLabelPart(0));
 	Assert::same('<label for="frm-list-0">Second</label>', (string) $input->getLabelPart(0));
 
-	Assert::type('Nette\Utils\Html', $input->getControl());
+	Assert::type(Nette\Utils\Html::class, $input->getControl());
 	Assert::same('<label><input type="radio" name="list" value="a">First</label><br><label><input type="radio" name="list" value="0">Second</label>', (string) $input->getControl());
 
-	Assert::type('Nette\Utils\Html', $input->getControlPart(0));
+	Assert::type(Nette\Utils\Html::class, $input->getControlPart(0));
 	Assert::same('<input type="radio" name="list" id="frm-list-0" value="0">', (string) $input->getControlPart(0));
 });
 
diff --git a/tests/Forms/Controls.SelectBox.loadData.phpt b/tests/Forms/Controls.SelectBox.loadData.phpt
index 738688d29..8358caccd 100644
--- a/tests/Forms/Controls.SelectBox.loadData.phpt
+++ b/tests/Forms/Controls.SelectBox.loadData.phpt
@@ -222,7 +222,7 @@ test(function () use ($series) { // setValue() and invalid argument
 
 	Assert::exception(function () use ($input) {
 		$input->setValue('unknown');
-	}, 'Nette\InvalidArgumentException', "Value 'unknown' is out of allowed set ['red-dwarf', 'the-simpsons', 0, ''] in field 'select'.");
+	}, Nette\InvalidArgumentException::class, "Value 'unknown' is out of allowed set ['red-dwarf', 'the-simpsons', 0, ''] in field 'select'.");
 });
 
 
diff --git a/tests/Forms/Controls.SelectBox.render.phpt b/tests/Forms/Controls.SelectBox.render.phpt
index c74f8bbbb..c9595ba5e 100644
--- a/tests/Forms/Controls.SelectBox.render.phpt
+++ b/tests/Forms/Controls.SelectBox.render.phpt
@@ -28,11 +28,11 @@ test(function () {
 		0 => 'Second',
 	]);
 
-	Assert::type('Nette\Utils\Html', $input->getLabel());
+	Assert::type(Nette\Utils\Html::class, $input->getLabel());
 	Assert::same('<label for="frm-list">Label</label>', (string) $input->getLabel());
 	Assert::same('<label for="frm-list">Another label</label>', (string) $input->getLabel('Another label'));
 
-	Assert::type('Nette\Utils\Html', $input->getControl());
+	Assert::type(Nette\Utils\Html::class, $input->getControl());
 	Assert::same('<select name="list" id="frm-list"><option value="a">First</option><option value="0">Second</option></select>', (string) $input->getControl());
 });
 
diff --git a/tests/Forms/Controls.TextArea.render.phpt b/tests/Forms/Controls.TextArea.render.phpt
index 1b53abe8f..c510d0cdf 100644
--- a/tests/Forms/Controls.TextArea.render.phpt
+++ b/tests/Forms/Controls.TextArea.render.phpt
@@ -27,11 +27,11 @@ test(function () {
 		->setValue('&text')
 		->setAttribute('autocomplete', 'off');
 
-	Assert::type('Nette\Utils\Html', $input->getLabel());
+	Assert::type(Nette\Utils\Html::class, $input->getLabel());
 	Assert::same('<label for="frm-text">Label</label>', (string) $input->getLabel());
 	Assert::same('<label for="frm-text">Another label</label>', (string) $input->getLabel('Another label'));
 
-	Assert::type('Nette\Utils\Html', $input->getControl());
+	Assert::type(Nette\Utils\Html::class, $input->getControl());
 	Assert::same('<textarea name="text" autocomplete="off" id="frm-text">&amp;text</textarea>', (string) $input->getControl());
 });
 
diff --git a/tests/Forms/Controls.TextBase.loadData.phpt b/tests/Forms/Controls.TextBase.loadData.phpt
index 3e0a25b86..9ae736427 100644
--- a/tests/Forms/Controls.TextBase.loadData.phpt
+++ b/tests/Forms/Controls.TextBase.loadData.phpt
@@ -98,7 +98,7 @@ test(function () { // setValue() and invalid argument
 
 	Assert::exception(function () use ($input) {
 		$input->setValue([]);
-	}, 'Nette\InvalidArgumentException', "Value must be scalar or NULL, array given in field 'text'.");
+	}, Nette\InvalidArgumentException::class, "Value must be scalar or NULL, array given in field 'text'.");
 });
 
 
diff --git a/tests/Forms/Controls.TextInput.render.phpt b/tests/Forms/Controls.TextInput.render.phpt
index d01ab6072..fd521df4b 100644
--- a/tests/Forms/Controls.TextInput.render.phpt
+++ b/tests/Forms/Controls.TextInput.render.phpt
@@ -27,11 +27,11 @@ test(function () {
 		->setValue('text')
 		->setAttribute('autocomplete', 'off');
 
-	Assert::type('Nette\Utils\Html', $input->getLabel());
+	Assert::type(Nette\Utils\Html::class, $input->getLabel());
 	Assert::same('<label for="frm-text">Label</label>', (string) $input->getLabel());
 	Assert::same('<label for="frm-text">Another label</label>', (string) $input->getLabel('Another label'));
 
-	Assert::type('Nette\Utils\Html', $input->getControl());
+	Assert::type(Nette\Utils\Html::class, $input->getControl());
 	Assert::same('<input type="text" name="text" autocomplete="off" id="frm-text" value="text">', (string) $input->getControl());
 });
 
diff --git a/tests/Forms/Controls.UploadControl.render.phpt b/tests/Forms/Controls.UploadControl.render.phpt
index 18a51e8d8..1f18ff536 100644
--- a/tests/Forms/Controls.UploadControl.render.phpt
+++ b/tests/Forms/Controls.UploadControl.render.phpt
@@ -25,11 +25,11 @@ test(function () {
 	$form = new Form;
 	$input = $form->addUpload('file', 'Label');
 
-	Assert::type('Nette\Utils\Html', $input->getLabel());
+	Assert::type(Nette\Utils\Html::class, $input->getLabel());
 	Assert::same('<label for="frm-file">Label</label>', (string) $input->getLabel());
 	Assert::same('<label for="frm-file">Another label</label>', (string) $input->getLabel('Another label'));
 
-	Assert::type('Nette\Utils\Html', $input->getControl());
+	Assert::type(Nette\Utils\Html::class, $input->getControl());
 	Assert::same('<input type="file" name="file" id="frm-file">', (string) $input->getControl());
 });
 
diff --git a/tests/Forms/Helpers.createSelectBox.phpt b/tests/Forms/Helpers.createSelectBox.phpt
index 7d27fb4d6..c94e848ee 100644
--- a/tests/Forms/Helpers.createSelectBox.phpt
+++ b/tests/Forms/Helpers.createSelectBox.phpt
@@ -14,7 +14,7 @@ require __DIR__ . '/../bootstrap.php';
 
 test(function () {
 	Assert::type(
-		'Nette\Utils\Html',
+		Nette\Utils\Html::class,
 		Helpers::createSelectBox([])
 	);