Add package contract tests

Author: SerafimArts

tests/CompatibilityTest.php

@@ -0,0 +1,48 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Boson\Component\OsInfo\Tests;
+
+use Boson\Component\OsInfo\StandardInterface;
+use Boson\Component\OsInfo\FamilyInterface;
+use PHPUnit\Framework\Attributes\DoesNotPerformAssertions;
+use PHPUnit\Framework\Attributes\Group;
+
+/**
+ * Note: Changing the behavior of these tests is allowed ONLY when updating
+ *       a MAJOR version of the package.
+ */
+#[Group('boson-php/os-info')]
+final class CompatibilityTest extends TestCase
+{
+    #[DoesNotPerformAssertions]
+    public function testStandardInterfaceCompatibility(): void
+    {
+        new class implements StandardInterface {
+            public string $name {
+                get {}
+            }
+            public ?StandardInterface $parent {
+                get {}
+            }
+            public function isSupports(StandardInterface $standard): bool {}
+            public function __toString(): string {}
+        };
+    }
+
+    #[DoesNotPerformAssertions]
+    public function testFamilyInterfaceCompatibility(): void
+    {
+        new class implements FamilyInterface {
+            public string $name {
+                get {}
+            }
+            public ?FamilyInterface $parent {
+                get {}
+            }
+            public function is(FamilyInterface $family): bool {}
+            public function __toString(): string {}
+        };
+    }
+}