add macroable test (#115)

tests/ZM/Utils/MacroableTest.php

@@ -0,0 +1,65 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\ZM\Utils;
+
+use PHPUnit\Framework\TestCase;
+use ZM\Exception\MethodNotFoundException;
+use ZM\Utils\Macroable;
+
+/**
+ * @internal
+ */
+class MacroableTest extends TestCase
+{
+    private $macroable;
+
+    protected function setUp(): void
+    {
+        $this->macroable = new class() {
+            use Macroable;
+
+            private $secret = 'secret';
+
+            private static function anotherSecret()
+            {
+                return 'another secret';
+            }
+        };
+    }
+
+    public function testMacroCanBeDefined(): void
+    {
+        $this->macroable::macro('getSecret', function () {
+            return $this->secret;
+        });
+
+        $this->assertEquals('secret', $this->macroable->getSecret());
+    }
+
+    public function testMacroCanBeDefinedStatically(): void
+    {
+        $this->macroable::macro('getSecret', static function () {
+            return 'static secret';
+        });
+
+        $this->assertEquals('static secret', $this->macroable::getSecret());
+    }
+
+    public function testMacroCanBeDefinedWithParameters(): void
+    {
+        $this->macroable::macro('getParam', function ($param) {
+            return $param;
+        });
+
+        $this->assertEquals('param', $this->macroable->getParam('param'));
+    }
+
+    public function testExceptionIsThrownWhenMacroIsNotDefined(): void
+    {
+        $this->expectException(MethodNotFoundException::class);
+
+        $this->macroable->unknownMacro();
+    }
+}