We have to use PolyfillTrait

Author: sanmai

composer.json

@@ -36,7 +36,8 @@
         "json-schema/json-schema-test-suite": "1.2.0",
         "phpunit/phpunit": ">=4.8.36 <10",
         "sanmai/phpunit-legacy-adapter": "^6.4 || ^8.2.1",
-        "phpspec/prophecy-phpunit": ">=1.0"
+        "phpspec/prophecy-phpunit": ">=1.0",
+        "phpunitgoodpractices/polyfill": "^1.6"
     },
     "extra": {
         "branch-alias": {

tests/ConstraintErrorTest.php

@@ -11,9 +11,12 @@
 
 use JsonSchema\ConstraintError;
 use LegacyPHPUnit\TestCase;
+use PHPUnitGoodPractices\Polyfill\PolyfillTrait;
 
 class ConstraintErrorTest extends TestCase
 {
+    use PolyfillTrait;
+
     public function testGetValidMessage()
     {
         $e = ConstraintError::ALL_OF();

tests/Constraints/FactoryTest.php

@@ -13,6 +13,7 @@
 use JsonSchema\Constraints\Factory;
 use JsonSchema\Entity\JsonPointer;
 use LegacyPHPUnit\TestCase;
+use PHPUnitGoodPractices\Polyfill\PolyfillTrait;
 
 /**
  * Class MyBadConstraint
@@ -37,6 +38,8 @@ public function check(&$value, $schema = null, JsonPointer $path = null, $i = nu
 
 class FactoryTest extends TestCase
 {
+    use PolyfillTrait;
+
     /**
      * @var Factory
      */

tests/Constraints/SchemaValidationTest.php

@@ -12,9 +12,12 @@
 use JsonSchema\Constraints\Constraint;
 use JsonSchema\Validator;
 use LegacyPHPUnit\TestCase;
+use PHPUnitGoodPractices\Polyfill\PolyfillTrait;
 
 class SchemaValidationTest extends TestCase
 {
+    use PolyfillTrait;
+
     protected $validateSchema = true;
 
     public function getInvalidTests()

tests/Constraints/SelfDefinedSchemaTest.php

@@ -10,9 +10,12 @@
 namespace JsonSchema\Tests\Constraints;
 
 use JsonSchema\Validator;
+use PHPUnitGoodPractices\Polyfill\PolyfillTrait;
 
 class SelfDefinedSchemaTest extends BaseTestCase
 {
+    use PolyfillTrait;
+
     protected $validateSchema = true;
 
     public function getInvalidTests()

tests/Constraints/TypeTest.php

@@ -12,6 +12,7 @@
 use JsonSchema\Constraints\TypeCheck\LooseTypeCheck;
 use JsonSchema\Constraints\TypeConstraint;
 use LegacyPHPUnit\TestCase;
+use PHPUnitGoodPractices\Polyfill\PolyfillTrait;
 
 /**
  * Class TypeTest
@@ -22,6 +23,8 @@
  */
 class TypeTest extends TestCase
 {
+    use PolyfillTrait;
+
     /**
      * @see testIndefiniteArticleForTypeInTypeCheckErrorMessage
      *

tests/Constraints/ValidationExceptionTest.php

@@ -13,9 +13,12 @@
 use JsonSchema\Exception\ValidationException;
 use JsonSchema\Validator;
 use LegacyPHPUnit\TestCase;
+use PHPUnitGoodPractices\Polyfill\PolyfillTrait;
 
 class ValidationExceptionTest extends TestCase
 {
+    use PolyfillTrait;
+
     public function testValidationException()
     {
         $exception = new ValidationException();

tests/Entity/JsonPointerTest.php

@@ -11,6 +11,7 @@
 
 use JsonSchema\Entity\JsonPointer;
 use LegacyPHPUnit\TestCase;
+use PHPUnitGoodPractices\Polyfill\PolyfillTrait;
 
 /**
  * @package JsonSchema\Tests\Entity
@@ -19,6 +20,8 @@
  */
 class JsonPointerTest extends TestCase
 {
+    use PolyfillTrait;
+
     /**
      * @dataProvider getTestData
      *

tests/RefTest.php

@@ -11,9 +11,12 @@
 
 use JsonSchema\Validator;
 use LegacyPHPUnit\TestCase;
+use PHPUnitGoodPractices\Polyfill\PolyfillTrait;
 
 class RefTest extends TestCase
 {
+    use PolyfillTrait;
+
     public function dataRefIgnoresSiblings()
     {
         return array(