Migrate to PHPUnit 10

.gitignore

@@ -1,6 +1,6 @@
 /vendor
 /composer.lock
-/.phpunit.result.cache
+/.phpunit.cache
 
 # https://stackoverflow.com/a/16318111
 /tools/*

composer.json

@@ -13,7 +13,7 @@
         "php": "^8.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.0",
+        "phpunit/phpunit": "^10.5",
         "php-coveralls/php-coveralls": "^2.2",
         "vimeo/psalm": "5.17.0"
     },

phpunit.xml

@@ -1,13 +1,14 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" colors="true" bootstrap="vendor/autoload.php" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" colors="true" bootstrap="vendor/autoload.php" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd" cacheDirectory=".phpunit.cache">
   <testsuites>
     <testsuite name="DateTime tests">
       <directory>tests</directory>
     </testsuite>
   </testsuites>
-  <coverage processUncoveredFiles="true">
+  <coverage/>
+  <source>
     <include>
       <directory suffix=".php">src</directory>
     </include>
-  </coverage>
+  </source>
 </phpunit>

tests/Clock/OffsetClockTest.php

@@ -32,7 +32,7 @@ public function testOffsetClock(int $second, int $nano, string $duration, int $e
         self::assertInstantIs($expectedSecond, $expectedNano, $clock->getTime());
     }
 
-    public function providerOffsetClock(): array
+    public static function providerOffsetClock(): array
     {
         return [
             [1000, 0, 'PT0.5S', 1000, 500000000],

tests/Clock/ScaleClockTest.php

@@ -39,7 +39,7 @@ public function testScaleClock(int $second, int $nano, string $duration, int $sc
         self::assertSame($expectedInstant, $actualTime->toDecimal());
     }
 
-    public function providerScaleClock(): array
+    public static function providerScaleClock(): array
     {
         return [
             [1000, 0, 'PT0.5S', 50, '1025'],

tests/DayOfWeekTest.php

@@ -32,7 +32,7 @@ public function testValues(int $expectedValue, DayOfWeek $dayOfWeek): void
         self::assertSame($expectedValue, $dayOfWeek->getValue());
     }
 
-    public function providerValues(): array
+    public static function providerValues(): array
     {
         return [
             [1, DayOfWeek::MONDAY],
@@ -60,7 +60,7 @@ public function testOfInvalidDayOfWeekThrowsException(int $dayOfWeek): void
         DayOfWeek::of($dayOfWeek);
     }
 
-    public function providerOfInvalidDayOfWeekThrowsException(): array
+    public static function providerOfInvalidDayOfWeekThrowsException(): array
     {
         return [
             [-1],
@@ -82,7 +82,7 @@ public function testNow(int $epochSecond, string $timeZone, DayOfWeek $expectedD
         self::assertSame($expectedDayOfWeek, DayOfWeek::now(TimeZone::parse($timeZone), $clock));
     }
 
-    public function providerNow(): array
+    public static function providerNow(): array
     {
         return [
             [1388534399, '-01:00', DayOfWeek::TUESDAY],
@@ -168,7 +168,7 @@ public function testIsWeekday(DayOfWeek $dayOfWeek, bool $isWeekday): void
         self::assertSame($isWeekday, $dayOfWeek->isWeekday());
     }
 
-    public function providerIsWeekday(): array
+    public static function providerIsWeekday(): array
     {
         return [
             [DayOfWeek::MONDAY, true],
@@ -189,7 +189,7 @@ public function testIsWeekend(DayOfWeek $dayOfWeek, bool $isWeekend): void
         self::assertSame($isWeekend, $dayOfWeek->isWeekend());
     }
 
-    public function providerIsWeekend(): array
+    public static function providerIsWeekend(): array
     {
         return [
             [DayOfWeek::MONDAY, false],
@@ -226,7 +226,7 @@ public function testMinus(DayOfWeek $dayOfWeek, int $plusDays, DayOfWeek $expect
         self::assertSame($expectedDayOfWeek, $dayOfWeek->minus(-$plusDays));
     }
 
-    public function providerPlus(): Generator
+    public static function providerPlus(): Generator
     {
         for ($dayOfWeek = DayOfWeek::MONDAY->value; $dayOfWeek <= DayOfWeek::SUNDAY->value; $dayOfWeek++) {
             for ($plusDays = -15; $plusDays <= 15; $plusDays++) {
@@ -266,7 +266,7 @@ public function testToString(DayOfWeek $dayOfWeek, string $expectedName): void
         self::assertSame($expectedName, $dayOfWeek->toString());
     }
 
-    public function providerToString(): array
+    public static function providerToString(): array
     {
         return [
             [DayOfWeek::MONDAY,    'Monday'],