Fix 'hasExampleData'

phpunit.xml

@@ -1,21 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd" bootstrap="vendor/autoload.php"
-         executionOrder="depends,defects" beStrictAboutOutputDuringTests="true" failOnRisky="false" failOnWarning="true"
-         cacheDirectory=".phpunit.cache" requireCoverageMetadata="false" beStrictAboutCoverageMetadata="false" colors="true">
-    <testsuites>
-        <testsuite name="default">
-            <directory>tests</directory>
-        </testsuite>
-    </testsuites>
-    <coverage/>
-    <source>
-        <include>
-            <directory suffix=".php">src</directory>
-        </include>
-    </source>
-    <extensions>
-        <bootstrap class="RobinIngelbrecht\PHPUnitPrettyPrint\PhpUnitExtension">
-        </bootstrap>
-    </extensions>
-</phpunit>

src/Solution.php

@@ -103,7 +103,10 @@ abstract class Solution
 
     public function hasExampleData(): bool
     {
-        return $this->exampleData['global'] !== [];
+        return
+            ($this->exampleData['global'] !== null && $this->exampleData['global'] !== [])
+            || ($this->exampleData['part1'] !== null && $this->exampleData['part1'] !== [])
+            || ($this->exampleData['part2'] !== null && $this->exampleData['part2'] !== []);
     }
 
     /**