Add test with service provider

tests/HyphenatorService.php

@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * Copyright Andreas Heigl <andreas@heigl.org>
+ *
+ * Licensed under the MIT-license. For details see the included file LICENSE.md
+ */
+
+namespace Org\Heigl\HyphenatorTest;
+
+use Org\Heigl\Hyphenator\Hyphenator;
+use Org\Heigl\Hyphenator\Options;
+
+final class HyphenatorService
+{
+    private static $instance = null;
+
+    public function __construct(Hyphenator $hyphenator, array $customPattern)
+    {
+        $o = new Options();
+        $o->setHyphen('-')
+            ->setDefaultLocale('de_DE')
+            ->setRightMin(2)
+            ->setLeftMin(2)
+            ->setWordMin(4)
+            ->setFilters('NonStandard')
+            ->setTokenizers('Whitespace, Punctuation');
+
+        $hyphenator->setOptions($o);
+
+        $dictionary = $hyphenator->getDictionaries()->current();
+        foreach ($customPattern as $string => $pattern) {
+            $dictionary->addPattern($string, $pattern);
+        }
+
+        $this->hyphenator = $hyphenator;
+    }
+
+    public static function singleton(): self
+    {
+        if (self::$instance === null) {
+            self::$instance = new self(new Hyphenator(), [
+                'spender' => '08000000',
+            ]);
+        }
+
+        return self::$instance;
+    }
+
+    public function hyphenate(string $word): array
+    {
+        return $this->hyphenator->hyphenate($word);
+    }
+}

tests/HyphenatorUserTest.php

@@ -28,4 +28,29 @@ public function testUsingTwoHyphenationPatterns()
 
         $this->assertEquals('Hand-tuch-spen-der', $hyphenator->hyphenate('Handtuchspender'));
     }
+
+    public function testMultipleHyphenationCallsResultInSameHyphenation()
+    {
+        $service = HyphenatorService::singleton();
+
+        $this->assertEquals([
+            'Hand-tuchspender',
+            'Handtuch-spender',
+            'Handtuchspen-der'
+        ], $service->hyphenate('Handtuchspender'));
+        $this->assertEquals([
+            'Hand-tuchspender',
+            'Handtuch-spender',
+            'Handtuchspen-der'
+        ], $service->hyphenate('Handtuchspender'));
+
+        $service2 = HyphenatorService::singleton();
+        $this->assertEquals([
+            'Hand-tuchspender',
+            'Handtuch-spender',
+            'Handtuchspen-der'
+        ], $service->hyphenate('Handtuchspender'));
+
+        $this->assertSame($service, $service2);
+    }
 }