Rewrote EventContextProviderTest to avoid using call_user_func()

`call_user_func()` is automatically optimized away by PHP-SRC starting from
early PHP 7 releases, and therefore cannot be used to generate artificial
stack frames that are detected in PHP-SRC itself.

With this change, we use `array_map()` instead, which (for now) is not optimized
away (yet).

test/EventLogging/EventContextProviderTest.php

@@ -7,38 +7,43 @@
 use Laminas\DeveloperTools\EventLogging\EventContextProvider;
 use PHPUnit\Framework\TestCase;
 
+use function array_map;
+
+/** @covers \Laminas\DeveloperTools\EventLogging\EventContextProvider */
 class EventContextProviderTest extends TestCase
 {
-    public function testEventTriggerFileForInvokables()
+    public function testEventTriggerFileDetectsEmptyFileLocationWhenStackFrameIsInPhpItself(): void
     {
-        $eventProviderClass = new class {
-            public function __invoke() {
-                return call_user_func([$this, 'get']);
-            }
-
-            private function get()
-            {
-                $eventProviderClass = new class {
-                    public function __invoke($invokableClass, int $maxLevel, int $level = 0)
-                    {
-                        if ($level < $maxLevel) {
-                            return $invokableClass($invokableClass, $maxLevel, ++$level);
-                        }
-
-                        return (new EventContextProvider())->getEventTriggerFile();
-                    }
-                };
-
-                return $eventProviderClass($eventProviderClass, 3);
-            }
-        };
-
-        $eventTriggerFile = $eventProviderClass();
-
         self::assertSame(
-            '',
-            $eventTriggerFile,
+            [
+                'stack frame on this file: EventLogging/EventContextProviderTest.php',
+                'stack frame in php core: ',
+                'stack frame on this file: EventLogging/EventContextProviderTest.php',
+            ],
+            // Important: `array_map()` needed here, as it produces a stack frame without "file" location
+            array_map(
+                [$this, 'callEventContextProviderWithStackTraceNestingLevelAndName'],
+                [
+                    'stack frame on this file',
+                    'stack frame in php core',
+                    'stack frame on this file',
+                ],
+                [
+                    3,
+                    4,
+                    5,
+                ]
+            ),
             'trigger file should be empty because user function calls do not refer to a file'
         );
     }
+
+    private function callEventContextProviderWithStackTraceNestingLevelAndName(string $name, int $level): string
+    {
+        if ($level > 0) {
+            return $this->callEventContextProviderWithStackTraceNestingLevelAndName($name, $level - 1);
+        }
+
+        return $name . ': ' . (new EventContextProvider())->getEventTriggerFile();
+    }
 }