diff --git a/.phpunit.cache/test-results b/.phpunit.cache/test-results
new file mode 100644
index 0000000..6fa6e94
--- /dev/null
+++ b/.phpunit.cache/test-results
@@ -0,0 +1 @@
+{"version":1,"defects":[],"times":{"SimpleSAML\\Test\\Assert\\AssertTest::testAssertionPassing":0.012,"SimpleSAML\\Test\\Assert\\AssertTest::testAssertionFailingThrowsException":0.001,"SimpleSAML\\Test\\Assert\\AssertTest::testAssertionFailingWithCustomExceptionThrowsCustomException":0,"SimpleSAML\\Test\\Assert\\AssertTest::testUnknownAssertionRaisesBadMethodCallException":0,"SimpleSAML\\Test\\Assert\\AssertTest::testUnknownNullOrAssertionRaisesBadMethodCallException":0,"SimpleSAML\\Test\\Assert\\AssertTest::testUnknownAllAssertionRaisesBadMethodCallException":0,"SimpleSAML\\Test\\Assert\\AssertTest::testNullOrCustomAssertionWorks":0,"SimpleSAML\\Test\\Assert\\AssertTest::testAllCustomAssertionWorks":0,"SimpleSAML\\Test\\Assert\\AssertTest::testValueToString#null":0.001,"SimpleSAML\\Test\\Assert\\AssertTest::testValueToString#true":0,"SimpleSAML\\Test\\Assert\\AssertTest::testValueToString#false":0,"SimpleSAML\\Test\\Assert\\AssertTest::testValueToString#array":0,"SimpleSAML\\Test\\Assert\\AssertTest::testValueToString#Stringable":0,"SimpleSAML\\Test\\Assert\\AssertTest::testValueToString#DateTime":0,"SimpleSAML\\Test\\Assert\\AssertTest::testValueToString#object":0,"SimpleSAML\\Test\\Assert\\AssertTest::testValueToString#resource":0,"SimpleSAML\\Test\\Assert\\AssertTest::testValueToString#string":0,"SimpleSAML\\Test\\Assert\\AssertTest::testValueToString#other":0,"SimpleSAML\\Test\\Assert\\Base64Test::testStringPlausibleBase64#valid":0,"SimpleSAML\\Test\\Assert\\Base64Test::testStringPlausibleBase64#bogus":0,"SimpleSAML\\Test\\Assert\\Base64Test::testStringPlausibleBase64#length not dividable by 4":0,"SimpleSAML\\Test\\Assert\\DateTimeTest::testValidDateTime#sub-second offset":0,"SimpleSAML\\Test\\Assert\\DateTimeTest::testValidDateTime#sub-second zulu":0,"SimpleSAML\\Test\\Assert\\DateTimeTest::testValidDateTime#offset":0,"SimpleSAML\\Test\\Assert\\DateTimeTest::testValidDateTime#zulu":0,"SimpleSAML\\Test\\Assert\\DateTimeTest::testValidDateTime#bogus":0,"SimpleSAML\\Test\\Assert\\DateTimeTest::testValidDateTime#whitespace":0,"SimpleSAML\\Test\\Assert\\DateTimeTest::testValidDateTimeZulu#sub-second zulu":0,"SimpleSAML\\Test\\Assert\\DateTimeTest::testValidDateTimeZulu#zulu":0,"SimpleSAML\\Test\\Assert\\DateTimeTest::testValidDateTimeZulu#sub-second offset":0,"SimpleSAML\\Test\\Assert\\DateTimeTest::testValidDateTimeZulu#offset":0,"SimpleSAML\\Test\\Assert\\DateTimeTest::testValidDateTimeZulu#bogus":0,"SimpleSAML\\Test\\Assert\\DateTimeTest::testValidDateTimeZulu#whitespace":0,"SimpleSAML\\Test\\Assert\\DurationTest::testValidDuration#0":0,"SimpleSAML\\Test\\Assert\\DurationTest::testValidDuration#1":0,"SimpleSAML\\Test\\Assert\\DurationTest::testValidDuration#2":0,"SimpleSAML\\Test\\Assert\\DurationTest::testValidDuration#3":0,"SimpleSAML\\Test\\Assert\\DurationTest::testValidDuration#4":0,"SimpleSAML\\Test\\Assert\\DurationTest::testValidDuration#5":0,"SimpleSAML\\Test\\Assert\\DurationTest::testValidDuration#6":0,"SimpleSAML\\Test\\Assert\\DurationTest::testValidDuration#7":0,"SimpleSAML\\Test\\Assert\\DurationTest::testValidDuration#8":0,"SimpleSAML\\Test\\Assert\\DurationTest::testValidDuration#9":0,"SimpleSAML\\Test\\Assert\\DurationTest::testValidDuration#10":0,"SimpleSAML\\Test\\Assert\\DurationTest::testValidDuration#11":0,"SimpleSAML\\Test\\Assert\\DurationTest::testValidDuration#12":0,"SimpleSAML\\Test\\Assert\\DurationTest::testValidDuration#13":0,"SimpleSAML\\Test\\Assert\\DurationTest::testValidDuration#14":0,"SimpleSAML\\Test\\Assert\\DurationTest::testValidDuration#15":0,"SimpleSAML\\Test\\Assert\\DurationTest::testValidDuration#16":0,"SimpleSAML\\Test\\Assert\\NCNameTest::testValidNCName#0":0,"SimpleSAML\\Test\\Assert\\NCNameTest::testValidNCName#1":0,"SimpleSAML\\Test\\Assert\\NCNameTest::testValidNCName#2":0,"SimpleSAML\\Test\\Assert\\NCNameTest::testValidNCName#3":0,"SimpleSAML\\Test\\Assert\\NCNameTest::testValidNCName#4":0,"SimpleSAML\\Test\\Assert\\NCNameTest::testValidNCName#5":0,"SimpleSAML\\Test\\Assert\\NotInArrayTest::testnotInArray#0":0,"SimpleSAML\\Test\\Assert\\NotInArrayTest::testnotInArray#1":0,"SimpleSAML\\Test\\Assert\\QNameTest::testValidQName#0":0,"SimpleSAML\\Test\\Assert\\QNameTest::testValidQName#1":0,"SimpleSAML\\Test\\Assert\\QNameTest::testValidQName#2":0,"SimpleSAML\\Test\\Assert\\QNameTest::testValidQName#3":0,"SimpleSAML\\Test\\Assert\\QNameTest::testValidQName#4":0,"SimpleSAML\\Test\\Assert\\QNameTest::testValidQName#5":0,"SimpleSAML\\Test\\Assert\\URITest::testValidURI#urn":0,"SimpleSAML\\Test\\Assert\\URITest::testValidURI#same-doc":0,"SimpleSAML\\Test\\Assert\\URITest::testValidURI#url":0,"SimpleSAML\\Test\\Assert\\URITest::testValidURI#bogus":0,"SimpleSAML\\Test\\Assert\\URITest::testValidURI#spn":0,"SimpleSAML\\Test\\Assert\\URITest::testValidURL#url":0,"SimpleSAML\\Test\\Assert\\URITest::testValidURL#same-doc":0,"SimpleSAML\\Test\\Assert\\URITest::testValidURL#urn":0,"SimpleSAML\\Test\\Assert\\URITest::testValidURL#bogus":0,"SimpleSAML\\Test\\Assert\\URITest::testValidURL#spn":0,"SimpleSAML\\Test\\Assert\\URITest::testValidURN#urn":0,"SimpleSAML\\Test\\Assert\\URITest::testValidURN#url":0,"SimpleSAML\\Test\\Assert\\URITest::testValidURN#same-doc":0,"SimpleSAML\\Test\\Assert\\URITest::testValidURN#bogus":0,"SimpleSAML\\Test\\Assert\\URITest::testValidURN#spn":0}}
\ No newline at end of file
diff --git a/tests/Assert/AssertTest.php b/tests/Assert/AssertTest.php
index 6b4d72d..1892fac 100644
--- a/tests/Assert/AssertTest.php
+++ b/tests/Assert/AssertTest.php
@@ -8,6 +8,7 @@
 use DateTimeImmutable;
 use ArrayIterator;
 use LogicException;
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 use ReflectionMethod;
 use SimpleSAML\Assert\Assert;
@@ -19,9 +20,7 @@
 use function opendir;
 
 /**
- * Class \SimpleSAML\Assert\Assert
- *
- * @package simplesamlphp/saml2
+ * Class \SimpleSAML\Assert\AssertTest
  */
 final class AssertTest extends TestCase
 {
@@ -113,10 +112,10 @@ public function testAllCustomAssertionWorks(): void
 
 
     /**
-     * @dataProvider provideValue
      * @param mixed $value
      * @param string $expected
      */
+    #[DataProvider('provideVValue')]
     public function testValueToString($value, string $expected): void
     {
         $assert = new Assert();
diff --git a/tests/Assert/Base64Test.php b/tests/Assert/Base64Test.php
index 173ed3a..5d20ed1 100644
--- a/tests/Assert/Base64Test.php
+++ b/tests/Assert/Base64Test.php
@@ -4,24 +4,24 @@
 
 namespace SimpleSAML\Test\Assert;
 
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 use SimpleSAML\Assert\Assert;
 use SimpleSAML\Assert\AssertionFailedException;
 
 /**
- * Class \SimpleSAML\Assert\Assert
+ * Class \SimpleSAML\Assert\Base64Test
  *
- * @package simplesamlphp/saml2
  * @covers \SimpleSAML\Assert\Assert::__callStatic
  * @covers \SimpleSAML\Assert\Assert::stringPlausibleBase64
  */
 final class Base64Test extends TestCase
 {
     /**
-     * @dataProvider provideBase64
      * @param boolean $shouldPass
      * @param string $name
      */
+    #[DataProvider('provideBase64')]
     public function testStringPlausibleBase64(bool $shouldPass, string $name): void
     {
         try {
diff --git a/tests/Assert/DateTimeTest.php b/tests/Assert/DateTimeTest.php
index 902e78a..7a23c30 100644
--- a/tests/Assert/DateTimeTest.php
+++ b/tests/Assert/DateTimeTest.php
@@ -4,14 +4,14 @@
 
 namespace SimpleSAML\Test\Assert;
 
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 use SimpleSAML\Assert\Assert;
 use SimpleSAML\Assert\AssertionFailedException;
 
 /**
- * Class \SimpleSAML\Assert\Assert
+ * Class \SimpleSAML\Assert\DateTimeTest
  *
- * @package simplesamlphp/saml2
  * @covers \SimpleSAML\Assert\Assert::__callStatic
  * @covers \SimpleSAML\Assert\Assert::validDateTime
  * @covers \SimpleSAML\Assert\Assert::validDateTimeZulu
@@ -19,10 +19,10 @@
 final class DateTimeTest extends TestCase
 {
     /**
-     * @dataProvider provideDateTime
      * @param boolean $shouldPass
      * @param string $timestamp
      */
+    #[DataProvider('provideDateTime')]
     public function testValidDateTime(bool $shouldPass, string $timestamp): void
     {
         try {
@@ -35,10 +35,10 @@ public function testValidDateTime(bool $shouldPass, string $timestamp): void
 
 
     /**
-     * @dataProvider provideDateTimeZulu
      * @param boolean $shouldPass
      * @param string $timestamp
      */
+    #[DataProvider('provideDateTime')]
     public function testValidDateTimeZulu(bool $shouldPass, string $timestamp): void
     {
         try {
diff --git a/tests/Assert/DurationTest.php b/tests/Assert/DurationTest.php
index a739625..b4629d3 100644
--- a/tests/Assert/DurationTest.php
+++ b/tests/Assert/DurationTest.php
@@ -4,6 +4,7 @@
 
 namespace SimpleSAML\Test\Assert;
 
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 use SimpleSAML\Assert\Assert;
 use SimpleSAML\Assert\AssertionFailedException;
@@ -11,17 +12,16 @@
 /**
  * Class \SimpleSAML\Assert\Assert
  *
- * @package simplesamlphp/saml2
  * @covers \SimpleSAML\Assert\Assert::__callStatic
  * @covers \SimpleSAML\Assert\Assert::validDuration
  */
 final class DurationTest extends TestCase
 {
     /**
-     * @dataProvider provideDuration
      * @param boolean $shouldPass
      * @param string $duration
      */
+    #[DataProvider('provideDuration')]
     public function testValidDuration(bool $shouldPass, string $duration): void
     {
         try {
diff --git a/tests/Assert/NCNameTest.php b/tests/Assert/NCNameTest.php
index d9955ed..022b6d6 100644
--- a/tests/Assert/NCNameTest.php
+++ b/tests/Assert/NCNameTest.php
@@ -4,24 +4,24 @@
 
 namespace SimpleSAML\Test\Assert;
 
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 use SimpleSAML\Assert\Assert;
 use SimpleSAML\Assert\AssertionFailedException;
 
 /**
- * Class \SimpleSAML\Assert\Assert
+ * Class \SimpleSAML\Assert\NCNameTest
  *
- * @package simplesamlphp/saml2
  * @covers \SimpleSAML\Assert\Assert::__callStatic
  * @covers \SimpleSAML\Assert\Assert::validNCName
  */
 final class NCNameTest extends TestCase
 {
     /**
-     * @dataProvider provideNCName
      * @param boolean $shouldPass
      * @param string $name
      */
+    #[DataProvider('provideNCName')]
     public function testValidNCName(bool $shouldPass, string $name): void
     {
         try {
diff --git a/tests/Assert/NotInArrayTest.php b/tests/Assert/NotInArrayTest.php
index bb7c946..02e3609 100644
--- a/tests/Assert/NotInArrayTest.php
+++ b/tests/Assert/NotInArrayTest.php
@@ -4,25 +4,25 @@
 
 namespace SimpleSAML\Test\Assert;
 
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 use SimpleSAML\Assert\Assert;
 use SimpleSAML\Assert\AssertionFailedException;
 
 /**
- * Class \SimpleSAML\Assert\Assert
+ * Class \SimpleSAML\Assert\NotInArrayTest
  *
- * @package simplesamlphp/saml2
  * @covers \SimpleSAML\Assert\Assert::__callStatic
  * @covers \SimpleSAML\Assert\Assert::notInArray
  */
 final class NotInArrayTest extends TestCase
 {
     /**
-     * @dataProvider provideNotInArray
      * @param boolean $shouldPass
      * @param mixed $item
      * @param array $arr
      */
+    #[DataProvider('provideNotInArray')]
     public function testnotInArray(bool $shouldPass, $item, array $arr): void
     {
         try {
diff --git a/tests/Assert/QNameTest.php b/tests/Assert/QNameTest.php
index 2eedee7..0d3f172 100644
--- a/tests/Assert/QNameTest.php
+++ b/tests/Assert/QNameTest.php
@@ -4,24 +4,24 @@
 
 namespace SimpleSAML\Test\Assert;
 
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 use SimpleSAML\Assert\Assert;
 use SimpleSAML\Assert\AssertionFailedException;
 
 /**
- * Class \SimpleSAML\Assert\Assert
+ * Class \SimpleSAML\Assert\QNameTest
  *
- * @package simplesamlphp/saml2
  * @covers \SimpleSAML\Assert\Assert::__callStatic
  * @covers \SimpleSAML\Assert\Assert::validQName
  */
 final class QNameTest extends TestCase
 {
     /**
-     * @dataProvider provideQName
      * @param boolean $shouldPass
      * @param string $name
      */
+    #[DataProvider('provideQName')]
     public function testValidQName(bool $shouldPass, string $name): void
     {
         try {
diff --git a/tests/Assert/URITest.php b/tests/Assert/URITest.php
index 0f74797..6913e6a 100644
--- a/tests/Assert/URITest.php
+++ b/tests/Assert/URITest.php
@@ -4,14 +4,14 @@
 
 namespace SimpleSAML\Test\Assert;
 
+use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
 use SimpleSAML\Assert\Assert;
 use SimpleSAML\Assert\AssertionFailedException;
 
 /**
- * Class \SimpleSAML\Assert\Assert
+ * Class \SimpleSAML\Assert\URITest
  *
- * @package simplesamlphp/saml2
  * @covers \SimpleSAML\Assert\Assert::__callStatic
  * @covers \SimpleSAML\Assert\Assert::validURI
  * @covers \SimpleSAML\Assert\Assert::validURL
@@ -20,10 +20,10 @@
 final class URITest extends TestCase
 {
     /**
-     * @dataProvider provideURI
      * @param boolean $shouldPass
      * @param string $uri
      */
+    #[DataProvider('provideURI')]
     public function testValidURI(bool $shouldPass, string $uri): void
     {
         try {
@@ -36,10 +36,10 @@ public function testValidURI(bool $shouldPass, string $uri): void
 
 
     /**
-     * @dataProvider provideURL
      * @param boolean $shouldPass
      * @param string $url
      */
+    #[DataProvider('provideURL')]
     public function testValidURL(bool $shouldPass, string $url): void
     {
         try {
@@ -52,10 +52,10 @@ public function testValidURL(bool $shouldPass, string $url): void
 
 
     /**
-     * @dataProvider provideURN
      * @param boolean $shouldPass
      * @param string $urn
      */
+    #[DataProvider('provideURN')]
     public function testValidURN(bool $shouldPass, string $urn): void
     {
         try {