diff --git a/tests/Executor/DeferredFieldsTest.php b/tests/Executor/DeferredFieldsTest.php
index cb33ccb2c..2d82cad72 100644
--- a/tests/Executor/DeferredFieldsTest.php
+++ b/tests/Executor/DeferredFieldsTest.php
@@ -61,7 +61,7 @@ final class DeferredFieldsTest extends TestCase
 
     private ObjectType $queryType;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->storyDataSource = [
             ['id' => 1, 'authorId' => 1, 'title' => 'Story #1', 'categoryIds' => [2, 3]],
diff --git a/tests/Executor/ListsTest.php b/tests/Executor/ListsTest.php
index 22bd68964..77b6e81f0 100644
--- a/tests/Executor/ListsTest.php
+++ b/tests/Executor/ListsTest.php
@@ -502,7 +502,7 @@ public function testHandlesNonNullListOfNonNullsWithArray(): void
      * @throws \Exception
      * @throws InvariantViolation
      */
-    public function checkHandlesNonNullListOfNonNulls($testData, array $expected, int $debug = DebugFlag::NONE): void
+    private function checkHandlesNonNullListOfNonNulls($testData, array $expected, int $debug = DebugFlag::NONE): void
     {
         $testType = Type::nonNull(Type::listOf(Type::nonNull(Type::int())));
         $this->check($testType, $testData, $expected, $debug);
diff --git a/tests/Executor/NonNullTest.php b/tests/Executor/NonNullTest.php
index 92c5bb291..13ec9305e 100644
--- a/tests/Executor/NonNullTest.php
+++ b/tests/Executor/NonNullTest.php
@@ -39,7 +39,7 @@ final class NonNullTest extends TestCase
 
     public Schema $schemaWithNonNullArg;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->syncError = new UserError('sync');
         $this->syncNonNullError = new UserError('syncNonNull');
diff --git a/tests/Executor/Promise/ReactPromiseAdapterTest.php b/tests/Executor/Promise/ReactPromiseAdapterTest.php
index 1c381c3b8..d3d5acb86 100644
--- a/tests/Executor/Promise/ReactPromiseAdapterTest.php
+++ b/tests/Executor/Promise/ReactPromiseAdapterTest.php
@@ -22,7 +22,7 @@ final class ReactPromiseAdapterTest extends TestCase
     /** @var class-string<object> */
     private string $classRejectedPromise;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         /** @var class-string<object> $classFulfilledPromise */
         $classFulfilledPromise = class_exists('\React\Promise\FulfilledPromise')
diff --git a/tests/Executor/Promise/SyncPromiseAdapterTest.php b/tests/Executor/Promise/SyncPromiseAdapterTest.php
index 00d363584..51c825a98 100644
--- a/tests/Executor/Promise/SyncPromiseAdapterTest.php
+++ b/tests/Executor/Promise/SyncPromiseAdapterTest.php
@@ -13,7 +13,7 @@ final class SyncPromiseAdapterTest extends TestCase
 {
     private SyncPromiseAdapter $promises;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->promises = new SyncPromiseAdapter();
     }
diff --git a/tests/Executor/ScopedContextTest.php b/tests/Executor/ScopedContextTest.php
index 0f9cb791a..b4bfe1a57 100644
--- a/tests/Executor/ScopedContextTest.php
+++ b/tests/Executor/ScopedContextTest.php
@@ -24,7 +24,7 @@ final class ScopedContextTest extends TestCase
     /** @var array<string, MyScopedContext|MySharedContext> */
     private array $contexts = [];
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->contexts = [];
 
diff --git a/tests/Executor/SyncTest.php b/tests/Executor/SyncTest.php
index 57f7bdef3..6223da240 100644
--- a/tests/Executor/SyncTest.php
+++ b/tests/Executor/SyncTest.php
@@ -28,7 +28,7 @@ final class SyncTest extends TestCase
 
     private SyncPromiseAdapter $promiseAdapter;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->schema = new Schema([
             'query' => new ObjectType([
diff --git a/tests/Executor/TestClasses/Human.php b/tests/Executor/TestClasses/Human.php
index 6f77c6d08..63ac8198f 100644
--- a/tests/Executor/TestClasses/Human.php
+++ b/tests/Executor/TestClasses/Human.php
@@ -4,8 +4,7 @@
 
 final class Human
 {
-    /** @var string */
-    public $name;
+    public string $name;
 
     public function __construct(string $name)
     {
diff --git a/tests/Executor/TestClasses/NotSpecial.php b/tests/Executor/TestClasses/NotSpecial.php
index 1aa9d4c89..c026f31d8 100644
--- a/tests/Executor/TestClasses/NotSpecial.php
+++ b/tests/Executor/TestClasses/NotSpecial.php
@@ -4,11 +4,9 @@
 
 final class NotSpecial
 {
-    /** @var string */
-    public $value;
+    public string $value;
 
-    /** @param string $value */
-    public function __construct($value)
+    public function __construct(string $value)
     {
         $this->value = $value;
     }
diff --git a/tests/Executor/TestClasses/NumberHolder.php b/tests/Executor/TestClasses/NumberHolder.php
index a7b5a4f1a..fd34f90cd 100644
--- a/tests/Executor/TestClasses/NumberHolder.php
+++ b/tests/Executor/TestClasses/NumberHolder.php
@@ -4,8 +4,7 @@
 
 final class NumberHolder
 {
-    /** @var float */
-    public $theNumber;
+    public float $theNumber;
 
     public function __construct(float $originalNumber)
     {
diff --git a/tests/Executor/TestClasses/Person.php b/tests/Executor/TestClasses/Person.php
index 56f99eabe..99a088241 100644
--- a/tests/Executor/TestClasses/Person.php
+++ b/tests/Executor/TestClasses/Person.php
@@ -4,8 +4,7 @@
 
 final class Person
 {
-    /** @var string */
-    public $name;
+    public string $name;
 
     /** @var array<Dog|Cat>|null */
     public ?array $pets;
diff --git a/tests/Executor/TestClasses/Special.php b/tests/Executor/TestClasses/Special.php
index 9b6c99ff6..fe21fc82f 100644
--- a/tests/Executor/TestClasses/Special.php
+++ b/tests/Executor/TestClasses/Special.php
@@ -4,11 +4,9 @@
 
 final class Special
 {
-    /** @var string */
-    public $value;
+    public string $value;
 
-    /** @param string $value */
-    public function __construct($value)
+    public function __construct(string $value)
     {
         $this->value = $value;
     }
diff --git a/tests/Executor/UnionInterfaceTest.php b/tests/Executor/UnionInterfaceTest.php
index 968cdac1e..50a448bff 100644
--- a/tests/Executor/UnionInterfaceTest.php
+++ b/tests/Executor/UnionInterfaceTest.php
@@ -30,7 +30,7 @@ final class UnionInterfaceTest extends TestCase
 
     public Person $john;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $NamedType = new InterfaceType([
             'name' => 'Named',
diff --git a/tests/Executor/VariablesTest.php b/tests/Executor/VariablesTest.php
index 4a8783873..40a11d690 100644
--- a/tests/Executor/VariablesTest.php
+++ b/tests/Executor/VariablesTest.php
@@ -134,7 +134,7 @@ private function executeQuery(string $query, ?array $variableValues = null): Exe
     }
 
     /** @throws InvariantViolation */
-    public function schema(): Schema
+    private function schema(): Schema
     {
         $ComplexScalarType = new ComplexScalar();
 
diff --git a/tests/PhpStan/Type/Definition/Type/IsAbstractTypeStaticMethodTypeSpecifyingExtension.php b/tests/PhpStan/Type/Definition/Type/IsAbstractTypeStaticMethodTypeSpecifyingExtension.php
index e4a6aab9d..b913f72f2 100644
--- a/tests/PhpStan/Type/Definition/Type/IsAbstractTypeStaticMethodTypeSpecifyingExtension.php
+++ b/tests/PhpStan/Type/Definition/Type/IsAbstractTypeStaticMethodTypeSpecifyingExtension.php
@@ -16,8 +16,7 @@
 
 final class IsAbstractTypeStaticMethodTypeSpecifyingExtension implements StaticMethodTypeSpecifyingExtension, TypeSpecifierAwareExtension
 {
-    /** @var TypeSpecifier */
-    private $typeSpecifier;
+    private TypeSpecifier $typeSpecifier;
 
     public function getClass(): string
     {
diff --git a/tests/PhpStan/Type/Definition/Type/IsCompositeTypeStaticMethodTypeSpecifyingExtension.php b/tests/PhpStan/Type/Definition/Type/IsCompositeTypeStaticMethodTypeSpecifyingExtension.php
index 54eaf8560..1a5a97b42 100644
--- a/tests/PhpStan/Type/Definition/Type/IsCompositeTypeStaticMethodTypeSpecifyingExtension.php
+++ b/tests/PhpStan/Type/Definition/Type/IsCompositeTypeStaticMethodTypeSpecifyingExtension.php
@@ -16,8 +16,7 @@
 
 final class IsCompositeTypeStaticMethodTypeSpecifyingExtension implements StaticMethodTypeSpecifyingExtension, TypeSpecifierAwareExtension
 {
-    /** @var TypeSpecifier */
-    private $typeSpecifier;
+    private TypeSpecifier $typeSpecifier;
 
     public function getClass(): string
     {
diff --git a/tests/PhpStan/Type/Definition/Type/IsInputTypeStaticMethodTypeSpecifyingExtension.php b/tests/PhpStan/Type/Definition/Type/IsInputTypeStaticMethodTypeSpecifyingExtension.php
index d4bb5cd45..f369bbc2a 100644
--- a/tests/PhpStan/Type/Definition/Type/IsInputTypeStaticMethodTypeSpecifyingExtension.php
+++ b/tests/PhpStan/Type/Definition/Type/IsInputTypeStaticMethodTypeSpecifyingExtension.php
@@ -16,8 +16,7 @@
 
 final class IsInputTypeStaticMethodTypeSpecifyingExtension implements StaticMethodTypeSpecifyingExtension, TypeSpecifierAwareExtension
 {
-    /** @var TypeSpecifier */
-    private $typeSpecifier;
+    private TypeSpecifier $typeSpecifier;
 
     public function getClass(): string
     {
diff --git a/tests/PhpStan/Type/Definition/Type/IsOutputTypeStaticMethodTypeSpecifyingExtension.php b/tests/PhpStan/Type/Definition/Type/IsOutputTypeStaticMethodTypeSpecifyingExtension.php
index 3dec70656..bede3665f 100644
--- a/tests/PhpStan/Type/Definition/Type/IsOutputTypeStaticMethodTypeSpecifyingExtension.php
+++ b/tests/PhpStan/Type/Definition/Type/IsOutputTypeStaticMethodTypeSpecifyingExtension.php
@@ -16,8 +16,7 @@
 
 final class IsOutputTypeStaticMethodTypeSpecifyingExtension implements StaticMethodTypeSpecifyingExtension, TypeSpecifierAwareExtension
 {
-    /** @var TypeSpecifier */
-    private $typeSpecifier;
+    private TypeSpecifier $typeSpecifier;
 
     public function getClass(): string
     {
diff --git a/tests/Server/QueryExecutionTest.php b/tests/Server/QueryExecutionTest.php
index 998a3782d..cb8fd3f34 100644
--- a/tests/Server/QueryExecutionTest.php
+++ b/tests/Server/QueryExecutionTest.php
@@ -23,7 +23,7 @@ final class QueryExecutionTest extends ServerTestCase
 
     private ServerConfig $config;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $schema = $this->buildSchema();
         $this->config = ServerConfig::create()
diff --git a/tests/Server/StandardServerTest.php b/tests/Server/StandardServerTest.php
index 4c5f7b909..5fbd4e709 100644
--- a/tests/Server/StandardServerTest.php
+++ b/tests/Server/StandardServerTest.php
@@ -21,7 +21,7 @@ final class StandardServerTest extends ServerTestCase
     /** @var ServerConfig */
     private $config;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $schema = $this->buildSchema();
         $this->config = ServerConfig::create()
diff --git a/tests/TestCaseBase.php b/tests/TestCaseBase.php
index 5da54f382..3c7d6a019 100644
--- a/tests/TestCaseBase.php
+++ b/tests/TestCaseBase.php
@@ -15,7 +15,7 @@ abstract class TestCaseBase extends TestCase
      *
      * @see TestCase::expectNotToPerformAssertions()
      */
-    public function assertDidNotCrash(): void
+    protected function assertDidNotCrash(): void
     {
         $this->addToAssertionCount(1);
     }
diff --git a/tests/Type/DefinitionTest.php b/tests/Type/DefinitionTest.php
index ab8f8a3ac..12bf5b8b1 100644
--- a/tests/Type/DefinitionTest.php
+++ b/tests/Type/DefinitionTest.php
@@ -55,7 +55,7 @@ final class DefinitionTest extends TestCaseBase
 
     public CustomScalarType $scalarType;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->objectType = new ObjectType(['name' => 'Object', 'fields' => ['tmp' => Type::string()]]);
         $this->interfaceType = new InterfaceType(['name' => 'Interface', 'fields' => ['irrelevant' => Type::int()]]);
diff --git a/tests/Type/EagerTypeLoaderTest.php b/tests/Type/EagerTypeLoaderTest.php
index 1ce9668e3..2b0bc8c4f 100644
--- a/tests/Type/EagerTypeLoaderTest.php
+++ b/tests/Type/EagerTypeLoaderTest.php
@@ -24,7 +24,7 @@ final class EagerTypeLoaderTest extends TypeLoaderTestCaseBase
 
     private InputObjectType $postStoryMutationInput;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/Type/EnumTypeTest.php b/tests/Type/EnumTypeTest.php
index 2c19fc77e..1f99baac4 100644
--- a/tests/Type/EnumTypeTest.php
+++ b/tests/Type/EnumTypeTest.php
@@ -33,7 +33,7 @@ final class EnumTypeTest extends TestCase
     /** @var \ArrayObject<string, int> */
     private \ArrayObject $Complex2;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $ColorType = new EnumType([
             'name' => 'Color',
diff --git a/tests/Type/LazyTypeLoaderTest.php b/tests/Type/LazyTypeLoaderTest.php
index 6aad472ee..e038725be 100644
--- a/tests/Type/LazyTypeLoaderTest.php
+++ b/tests/Type/LazyTypeLoaderTest.php
@@ -29,7 +29,7 @@ final class LazyTypeLoaderTest extends TypeLoaderTestCaseBase
     /** @var array<string, Type> */
     private array $loadedTypes = [];
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/Type/SchemaTest.php b/tests/Type/SchemaTest.php
index 10d4ee757..5781b9c80 100644
--- a/tests/Type/SchemaTest.php
+++ b/tests/Type/SchemaTest.php
@@ -25,7 +25,7 @@ final class SchemaTest extends TestCase
 
     private Schema $schema;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->interfaceType = new InterfaceType([
             'name' => 'Interface',
diff --git a/tests/Type/TestClasses/MyCustomType.php b/tests/Type/TestClasses/MyCustomType.php
index e2a927fcf..609ab0a97 100644
--- a/tests/Type/TestClasses/MyCustomType.php
+++ b/tests/Type/TestClasses/MyCustomType.php
@@ -9,11 +9,10 @@ final class MyCustomType extends ObjectType
 {
     public function __construct()
     {
-        $config = [
+        parent::__construct([
             'fields' => [
                 'a' => Type::string(),
             ],
-        ];
-        parent::__construct($config);
+        ]);
     }
 }
diff --git a/tests/Type/TestClasses/ObjectIdStub.php b/tests/Type/TestClasses/ObjectIdStub.php
index 2ee440573..1d3cc43a2 100644
--- a/tests/Type/TestClasses/ObjectIdStub.php
+++ b/tests/Type/TestClasses/ObjectIdStub.php
@@ -4,11 +4,9 @@
 
 final class ObjectIdStub
 {
-    /** @var int */
-    private $id;
+    private int $id;
 
-    /** @param int $id */
-    public function __construct($id)
+    public function __construct(int $id)
     {
         $this->id = $id;
     }
diff --git a/tests/Type/TestClasses/OtherCustom.php b/tests/Type/TestClasses/OtherCustom.php
index ef5a7ecfc..109b9ff38 100644
--- a/tests/Type/TestClasses/OtherCustom.php
+++ b/tests/Type/TestClasses/OtherCustom.php
@@ -5,18 +5,15 @@
 use GraphQL\Type\Definition\ObjectType;
 use GraphQL\Type\Definition\Type;
 
-/**
- * Note: named OtherCustom vs OtherCustomType intentionally.
- */
+/** Named OtherCustom vs. OtherCustomType intentionally. */
 final class OtherCustom extends ObjectType
 {
     public function __construct()
     {
-        $config = [
+        parent::__construct([
             'fields' => [
                 'b' => Type::string(),
             ],
-        ];
-        parent::__construct($config);
+        ]);
     }
 }
diff --git a/tests/Type/TypeLoaderTestCaseBase.php b/tests/Type/TypeLoaderTestCaseBase.php
index ee9e8919c..ae965cab3 100644
--- a/tests/Type/TypeLoaderTestCaseBase.php
+++ b/tests/Type/TypeLoaderTestCaseBase.php
@@ -24,7 +24,7 @@ abstract class TypeLoaderTestCaseBase extends TestCaseBase
     /** @var array<int, string> */
     protected array $calls;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->calls = [];
     }
diff --git a/tests/Type/ValidationTest.php b/tests/Type/ValidationTest.php
index 21c1fe6ab..af59ebe41 100644
--- a/tests/Type/ValidationTest.php
+++ b/tests/Type/ValidationTest.php
@@ -55,7 +55,7 @@ final class ValidationTest extends TestCaseBase
 
     public float $Number;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->Number = 1;
 
diff --git a/tests/Utils/BreakingChangesFinderTest.php b/tests/Utils/BreakingChangesFinderTest.php
index fd263cab7..b9c365063 100644
--- a/tests/Utils/BreakingChangesFinderTest.php
+++ b/tests/Utils/BreakingChangesFinderTest.php
@@ -18,7 +18,7 @@ final class BreakingChangesFinderTest extends TestCase
 {
     private ObjectType $queryType;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->queryType = new ObjectType([
             'name' => 'Query',
diff --git a/tests/Utils/CoerceInputValueTest.php b/tests/Utils/CoerceInputValueTest.php
index 90ba5e06c..6d23ea69a 100644
--- a/tests/Utils/CoerceInputValueTest.php
+++ b/tests/Utils/CoerceInputValueTest.php
@@ -36,7 +36,7 @@ final class CoerceInputValueTest extends TestCase
     /** @var ListOfType<ListOfType<ScalarType>> */
     private ListOfType $testNestedList;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->testNonNull = Type::nonNull(Type::int());
 
diff --git a/tests/Utils/ExtractTypesTest.php b/tests/Utils/ExtractTypesTest.php
index 9c6b0a119..1a73b3ee8 100644
--- a/tests/Utils/ExtractTypesTest.php
+++ b/tests/Utils/ExtractTypesTest.php
@@ -52,7 +52,7 @@ final class ExtractTypesTest extends TestCase
     /** @var InputObjectType */
     private $postCommentMutationInput;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->node = new InterfaceType([
             'name' => 'Node',
diff --git a/tests/Utils/MixedStoreTest.php b/tests/Utils/MixedStoreTest.php
index 83bc86678..ea1a63633 100644
--- a/tests/Utils/MixedStoreTest.php
+++ b/tests/Utils/MixedStoreTest.php
@@ -11,37 +11,38 @@ final class MixedStoreTest extends TestCase
     /** @var MixedStore<mixed> */
     private MixedStore $mixedStore;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->mixedStore = new MixedStore();
     }
 
-    public function testAcceptsNullKeys(): void
+    /**
+     * @dataProvider possibleValues
+     *
+     * @param mixed $value anything goes
+     */
+    public function testAcceptsNullKeys($value): void
     {
-        foreach ($this->possibleValues() as $value) {
-            $this->assertAcceptsKeyValue(null, $value);
-        }
+        $this->assertAcceptsKeyValue(null, $value);
     }
 
-    /** @return array<int, mixed> */
-    public function possibleValues(): array
+    /** @return iterable<array{mixed}> */
+    public static function possibleValues(): iterable
     {
+        yield [null];
+        yield [false];
+        yield [true];
+        yield [''];
+        yield ['0'];
+        yield ['1'];
+        yield ['a'];
+        yield [[]];
+        yield [new \stdClass()];
+        yield [static function (): void {}];
+
         /** @var MixedStore<mixed> $mixedStore */
         $mixedStore = new MixedStore();
-
-        return [
-            null,
-            false,
-            true,
-            '',
-            '0',
-            '1',
-            'a',
-            [],
-            new \stdClass(),
-            static function (): void {},
-            $mixedStore,
-        ];
+        yield [$mixedStore];
     }
 
     /**
@@ -89,62 +90,71 @@ private function assertProvidesArrayAccess($key, $value): void
         self::assertFalse(isset($this->mixedStore[$key]), $err);
     }
 
-    public function testAcceptsBoolKeys(): void
+    /**
+     * @dataProvider possibleValues
+     *
+     * @param mixed $value anything goes
+     */
+    public function testAcceptsBoolKeys($value): void
     {
-        foreach ($this->possibleValues() as $value) {
-            $this->assertAcceptsKeyValue(false, $value);
-        }
-
-        foreach ($this->possibleValues() as $value) {
-            $this->assertAcceptsKeyValue(true, $value);
-        }
+        $this->assertAcceptsKeyValue(false, $value);
+        $this->assertAcceptsKeyValue(true, $value);
     }
 
-    public function testAcceptsIntKeys(): void
+    /**
+     * @dataProvider possibleValues
+     *
+     * @param mixed $value anything goes
+     */
+    public function testAcceptsIntKeys($value): void
     {
-        foreach ($this->possibleValues() as $value) {
-            $this->assertAcceptsKeyValue(-100000, $value);
-            $this->assertAcceptsKeyValue(-1, $value);
-            $this->assertAcceptsKeyValue(0, $value);
-            $this->assertAcceptsKeyValue(1, $value);
-            $this->assertAcceptsKeyValue(1000000, $value);
-        }
+        $this->assertAcceptsKeyValue(-100000, $value);
+        $this->assertAcceptsKeyValue(-1, $value);
+        $this->assertAcceptsKeyValue(0, $value);
+        $this->assertAcceptsKeyValue(1, $value);
+        $this->assertAcceptsKeyValue(1000000, $value);
     }
 
-    public function testAcceptsFloatKeys(): void
+    /**
+     * @dataProvider possibleValues
+     *
+     * @param mixed $value anything goes
+     */
+    public function testAcceptsFloatKeys($value): void
     {
-        foreach ($this->possibleValues() as $value) {
-            $this->assertAcceptsKeyValue(-100000.5, $value);
-            $this->assertAcceptsKeyValue(-1.6, $value);
-            $this->assertAcceptsKeyValue(-0.0001, $value);
-            $this->assertAcceptsKeyValue(0.0000, $value);
-            $this->assertAcceptsKeyValue(0.0001, $value);
-            $this->assertAcceptsKeyValue(1.6, $value);
-            $this->assertAcceptsKeyValue(1000000.5, $value);
-        }
+        $this->assertAcceptsKeyValue(-100000.5, $value);
+        $this->assertAcceptsKeyValue(-1.6, $value);
+        $this->assertAcceptsKeyValue(-0.0001, $value);
+        $this->assertAcceptsKeyValue(0.0000, $value);
+        $this->assertAcceptsKeyValue(0.0001, $value);
+        $this->assertAcceptsKeyValue(1.6, $value);
+        $this->assertAcceptsKeyValue(1000000.5, $value);
     }
 
-    public function testAcceptsArrayKeys(): void
+    /**
+     * @dataProvider possibleValues
+     *
+     * @param mixed $value anything goes
+     */
+    public function testAcceptsArrayKeys($value): void
     {
-        foreach ($this->possibleValues() as $value) {
-            $this->assertAcceptsKeyValue([], $value);
-            $this->assertAcceptsKeyValue([null], $value);
-            $this->assertAcceptsKeyValue([[]], $value);
-            $this->assertAcceptsKeyValue([new \stdClass()], $value);
-            $this->assertAcceptsKeyValue(['a', 'b'], $value);
-            $this->assertAcceptsKeyValue(['a' => 'b'], $value);
-        }
+        $this->assertAcceptsKeyValue([], $value);
+        $this->assertAcceptsKeyValue([null], $value);
+        $this->assertAcceptsKeyValue([[]], $value);
+        $this->assertAcceptsKeyValue([new \stdClass()], $value);
+        $this->assertAcceptsKeyValue(['a', 'b'], $value);
+        $this->assertAcceptsKeyValue(['a' => 'b'], $value);
     }
 
-    public function testAcceptsObjectKeys(): void
+    /**
+     * @dataProvider possibleValues
+     *
+     * @param mixed $value anything goes
+     */
+    public function testAcceptsObjectKeys($value): void
     {
-        foreach ($this->possibleValues() as $value) {
-            $this->assertAcceptsKeyValue(new \stdClass(), $value);
-            $this->assertAcceptsKeyValue(new MixedStore(), $value);
-            $this->assertAcceptsKeyValue(
-                static function (): void {},
-                $value
-            );
-        }
+        $this->assertAcceptsKeyValue(new \stdClass(), $value);
+        $this->assertAcceptsKeyValue(new MixedStore(), $value);
+        $this->assertAcceptsKeyValue(static function (): void {}, $value);
     }
 }
diff --git a/tests/Utils/SchemaExtenderTest/SomeInterfaceClassType.php b/tests/Utils/SchemaExtenderTest/SomeInterfaceClassType.php
index df7bb25cd..deba5dbbc 100644
--- a/tests/Utils/SchemaExtenderTest/SomeInterfaceClassType.php
+++ b/tests/Utils/SchemaExtenderTest/SomeInterfaceClassType.php
@@ -6,9 +6,7 @@
 use GraphQL\Type\Definition\ObjectType;
 use GraphQL\Type\Definition\ResolveInfo;
 
-/**
- * Custom class-based interface type for testing.
- */
+/** Custom class-based interface type for testing. */
 final class SomeInterfaceClassType extends InterfaceType
 {
     public ObjectType $concrete;
diff --git a/tests/Utils/SchemaExtenderTest/SomeObjectClassType.php b/tests/Utils/SchemaExtenderTest/SomeObjectClassType.php
index bda5ea50a..cf8a0078b 100644
--- a/tests/Utils/SchemaExtenderTest/SomeObjectClassType.php
+++ b/tests/Utils/SchemaExtenderTest/SomeObjectClassType.php
@@ -5,9 +5,7 @@
 use GraphQL\Type\Definition\ObjectType;
 use GraphQL\Type\Definition\ResolveInfo;
 
-/**
- * Custom class-based interface type for testing.
- */
+/** Custom class-based interface type for testing. */
 final class SomeObjectClassType extends ObjectType
 {
     public function isTypeOf($objectValue, $context, ResolveInfo $info): bool
diff --git a/tests/Utils/SchemaExtenderTest/SomeScalarClassType.php b/tests/Utils/SchemaExtenderTest/SomeScalarClassType.php
index 2f7f4ffce..f28013a21 100644
--- a/tests/Utils/SchemaExtenderTest/SomeScalarClassType.php
+++ b/tests/Utils/SchemaExtenderTest/SomeScalarClassType.php
@@ -5,9 +5,7 @@
 use GraphQL\Language\AST\Node;
 use GraphQL\Type\Definition\ScalarType;
 
-/**
- * Custom class-based scalar type for testing.
- */
+/** Custom class-based scalar type for testing. */
 final class SomeScalarClassType extends ScalarType
 {
     public const SERIALIZE_RETURN = 'a constant value that is always returned from serialize';
diff --git a/tests/Utils/SchemaExtenderTest/SomeUnionClassType.php b/tests/Utils/SchemaExtenderTest/SomeUnionClassType.php
index b3cc7243d..49c997369 100644
--- a/tests/Utils/SchemaExtenderTest/SomeUnionClassType.php
+++ b/tests/Utils/SchemaExtenderTest/SomeUnionClassType.php
@@ -6,9 +6,7 @@
 use GraphQL\Type\Definition\ResolveInfo;
 use GraphQL\Type\Definition\UnionType;
 
-/**
- * Custom class-based union type for testing.
- */
+/** Custom class-based union type for testing. */
 final class SomeUnionClassType extends UnionType
 {
     public ObjectType $concrete;
diff --git a/tests/Validator/KnownDirectivesTest.php b/tests/Validator/KnownDirectivesTest.php
index 679ccef2f..5b0deb308 100644
--- a/tests/Validator/KnownDirectivesTest.php
+++ b/tests/Validator/KnownDirectivesTest.php
@@ -15,7 +15,7 @@ final class KnownDirectivesTest extends ValidatorTestCase
 {
     public Schema $schemaWithSDLDirectives;
 
-    public function setUp(): void
+    protected function setUp(): void
     {
         $this->schemaWithSDLDirectives = BuildSchema::build('
           directive @onSchema on SCHEMA