Add ClosureContextProcessor (#1745)

Co-authored-by: Jordi Boggiano <j.boggiano@seld.be>

tests/Monolog/Processor/ClosureContextProcessorTest.php

@@ -0,0 +1,69 @@
+<?php declare(strict_types=1);
+
+/*
+ * This file is part of the Monolog package.
+ *
+ * (c) Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Monolog\Processor;
+
+use Monolog\Test\TestCase;
+
+class ClosureContextProcessorTest extends TestCase
+{
+    public function testReplace()
+    {
+        $context = ['obj' => new \stdClass()];
+        $processor = new ClosureContextProcessor();
+
+        $record = $processor($this->getRecord(context: [fn () => $context]));
+        $this->assertSame($context, $record->context);
+    }
+
+    /**
+     * @dataProvider getContexts
+     */
+    public function testSkip(array $context)
+    {
+        $processor = new ClosureContextProcessor();
+
+        $record = $processor($this->getRecord(context: $context));
+        $this->assertSame($context, $record->context);
+    }
+
+    public function testClosureReturnsNotArray()
+    {
+        $object = new \stdClass();
+        $processor = new ClosureContextProcessor();
+
+        $record = $processor($this->getRecord(context: [fn () => $object]));
+        $this->assertSame([$object], $record->context);
+    }
+
+    public function testClosureThrows()
+    {
+        $exception = new \Exception('For test.');
+        $expected = [
+            'error_on_context_generation' => 'For test.',
+            'exception' => $exception,
+        ];
+        $processor = new ClosureContextProcessor();
+
+        $record = $processor($this->getRecord(context: [fn () => throw $exception]));
+        $this->assertSame($expected, $record->context);
+    }
+
+    public function getContexts(): iterable
+    {
+        yield [['foo']];
+        yield [['foo' => 'bar']];
+        yield [['foo', 'bar']];
+        yield [['foo', fn () => 'bar']];
+        yield [[fn () => 'foo', 'bar']];
+        yield [['foo' => fn () => 'bar']];
+    }
+}