[tests] Add test for CallableContextProcessor

Assert that string functions don't get called only closures

Issue: MOYA-1244

tests/Processor/CallableContextProcessorTest.php

@@ -0,0 +1,40 @@
+<?php declare(strict_types=1);
+
+namespace Stefna\Logger\Processor;
+
+use PHPUnit\Framework\Assert;
+use PHPUnit\Framework\TestCase;
+
+function testingFunction()
+{
+	print("should not print this");
+}
+
+final class CallableContextProcessorTest extends TestCase
+{
+	public function testCallableContextProcessorDoesNotCallFunctionStrings()
+	{
+		$stringFunction  = 'Stefna\Logger\Processor\testingFunction';
+
+		$this->expectOutputString("");
+		$processor = new CallableContextProcessor();
+		$processor([
+			'context' => [
+				'valueShouldNotBeCalled' => $stringFunction,
+			],
+		]);
+	}
+
+	public function testCallableContextProcessorCallsClosures()
+	{
+		$this->expectOutputString("should print this");
+		$processor = new CallableContextProcessor();
+		$processor([
+			'context' => [
+				'valueShouldNotBeCalled' => function () {
+					print("should print this");
+				},
+			],
+		]);
+	}
+}