update fileReader

Author: Alexsey-VR

src/FileReader.php

@@ -6,23 +6,17 @@ class FileReader implements FileReaderInterface
 {
     private const MAX_FILE_SIZE = 4096;
 
-    public function __construct()
-    {
-    }
-
-    public function readFile(string $filename): array | null
+    public function readFile(string $filename, bool $isArray = null): array | null
     {
         if (file_exists($filename)) {
             $handle = fopen($filename, "r");
-            $result = json_decode(fread($handle, self::MAX_FILE_SIZE));
+            $result = json_decode(fread($handle, self::MAX_FILE_SIZE), $isArray);
             fclose($handle);
             $type = gettype($result);
             if ($type === 'object') {
                 return (get_object_vars($result));
             } elseif ($type === 'array') {
                 return $result;
-            } else {
-                return null;
             }
         } else {
             return null;

tests/FileReaderTest.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace Differ;
+
+use PHPUnit\Framework\TestCase;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\CoversMethod;
+use Differ\FileReader;
+
+#[CoversClass(FileReader::class)]
+#[CoversMethod(FileReader::class, 'readFile')]
+class FileReaderTest extends TestCase
+{
+    public function testReadFileAsObject()
+    {
+        $fileReader = new FileReader();
+
+        $fileContent = $fileReader->readFile(
+            __DIR__ . "/../fixtures/fileForArray.json");
+        
+        $this->assertJsonStringEqualsJsonFile(
+            __DIR__ . "/../fixtures/fileForArray.json",
+            json_encode($fileContent));
+    }
+
+    public function testReadFileAsArray()
+    {
+        $fileReader = new FileReader();
+
+        $fileContent = $fileReader->readFile(
+            __DIR__ . "/../fixtures/fileForArray.json",
+            true
+        );
+        
+        $this->assertJsonStringEqualsJsonFile(
+            __DIR__ . "/../fixtures/fileForArray.json",
+            json_encode($fileContent));
+    }
+
+    public function testReadFileNotJson()
+    {
+        $fileReader = new FileReader();
+
+        $fileContent = $fileReader->readFile(
+            __DIR__ . "/../fixtures/fileNotJson.json"
+        );
+        
+        $this->assertNull($fileContent);
+    }
+}