[CLEANUP] Simplify a data provider

Remove logic to make it easier to grok.

Author: oliverklee

tests/Unit/Value/ValueTest.php

@@ -28,17 +28,12 @@ final class ValueTest extends TestCase
      */
     public static function provideArithmeticOperator(): array
     {
-        $units = ['+', '-', '*', '/'];
-
-        return \array_combine(
-            $units,
-            \array_map(
-                static function (string $unit): array {
-                    return [$unit];
-                },
-                $units
-            )
-        );
+        return [
+            '+' => ['+'],
+            '-' => ['-'],
+            '*' => ['*'],
+            '/' => ['/'],
+        ];
     }
 
     /**
@@ -53,7 +48,7 @@ public function parsesArithmeticInFunctions(string $operator): void
             self::DEFAULT_DELIMITERS
         );
 
-        self::assertSame('max(300px,50vh ' . $operator . ' 10px)', (string) $subject);
+        self::assertSame('max(300px,50vh ' . $operator . ' 10px)', (string)$subject);
     }
 
     /**
@@ -95,7 +90,7 @@ public function parsesArithmeticWithMultipleOperatorsInFunctions(
             self::DEFAULT_DELIMITERS
         );
 
-        self::assertSame(\sprintf($expectedResultTemplate, $expression), (string) $subject);
+        self::assertSame(\sprintf($expectedResultTemplate, $expression), (string)$subject);
     }
 
     /**
@@ -123,6 +118,6 @@ public function parsesArithmeticWithMalformedOperandsInFunctions(string $leftOpe
             self::DEFAULT_DELIMITERS
         );
 
-        self::assertSame('max(300px,' . $leftOperand . ' + ' . $rightOperand . ')', (string) $subject);
+        self::assertSame('max(300px,' . $leftOperand . ' + ' . $rightOperand . ')', (string)$subject);
     }
 }