@@ -58,7 +58,7 @@ public function testNormalizeWithoutProposals()
5858 $ node ->normalize (['beta ' => 'foo ' ]);
5959 }
6060
61- public function ignoreAndRemoveMatrixProvider (): array
61+ public static function ignoreAndRemoveMatrixProvider (): array
6262 {
6363 $ unrecognizedOptionException = new InvalidConfigurationException ('Unrecognized option "foo" under "root" ' );
6464
@@ -100,7 +100,7 @@ public function testPreNormalize(array $denormalized, array $normalized)
100100 $ this ->assertSame ($ normalized , $ r ->invoke ($ node , $ denormalized ));
101101 }
102102
103- public function getPreNormalizationTests (): array
103+ public static function getPreNormalizationTests (): array
104104 {
105105 return [
106106 [
@@ -142,7 +142,7 @@ public function testNodeNameCanBeZero(array $denormalized, array $normalized)
142142 $ this ->assertSame ($ normalized , $ r ->invoke ($ rootNode , $ denormalized ));
143143 }
144144
145- public function getZeroNamedNodeExamplesData (): array
145+ public static function getZeroNamedNodeExamplesData (): array
146146 {
147147 return [
148148 [
@@ -189,7 +189,7 @@ public function testChildrenOrderIsMaintainedOnNormalizeValue(array $prenormaliz
189189 $ this ->assertSame ($ normalized , $ r ->invoke ($ node , $ prenormalized ));
190190 }
191191
192- public function getPreNormalizedNormalizedOrderedData (): array
192+ public static function getPreNormalizedNormalizedOrderedData (): array
193193 {
194194 return [
195195 [
@@ -353,7 +353,7 @@ public function testMergeWithIgnoringExtraKeys(array $prenormalizeds, array $mer
353353 $ this ->assertEquals ($ merged , $ r ->invoke ($ node , ...$ prenormalizeds ));
354354 }
355355
356- public function getDataWithIncludedExtraKeys (): array
356+ public static function getDataWithIncludedExtraKeys (): array
357357 {
358358 return [
359359 [
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