Some minor changes

src/Command/ListAccountsCommand.php

@@ -8,8 +8,6 @@
 
 class ListAccountsCommand extends AbstractCommand
 {
-    public const RETURN_VAR_NOT_FOUND = 4;
-
     public const BANK = 'bank';
 
     public const NUMBER = 'number';

src/Command/ListUsersCommand.php

@@ -20,7 +20,7 @@ public function execute(): ?DOMDocument
 
         $result = $this->getShellCommandExecutor()->execute($shellCommand);
 
-        if (4 === $result->getReturnVar()) {
+        if (self::RETURN_VAR_NOT_FOUND === $result->getReturnVar()) {
             return null;
         }
 

src/Command/ShellCommandExecutor.php

@@ -25,10 +25,7 @@ public function execute(string $shellCommand): Result
 
         exec($shellCommand . ' 2>' . $tempFile, $output, $returnVar);
 
-        $errorOutput = file($tempFile);
-        $errorOutput = array_map(function ($line) {
-            return rtrim($line, "\r\n");
-        }, $errorOutput);
+        $errorOutput = array_map(fn ($line) => rtrim($line, "\r\n"), file($tempFile));
         unlink($tempFile);
 
         return new Result($output, $errorOutput, $returnVar);

src/Command/ShellCommandExecutor/DefectiveResultException.php

@@ -17,7 +17,7 @@ public function __construct(string $message = '', int $code = 0, Exception $prev
         parent::__construct(
             $message .
             " - Command: " . $shellCommand .
-            " - Errors: " . implode(PHP_EOL, $result->getErrors()),
+            " - Errors: " . implode(PHP_EOL, $result?->getErrors()),
             $code,
             $previous
         );

src/Command/ShellCommandExecutor/ResultAnalyzer.php

@@ -59,7 +59,7 @@ public function isDefectiveResult(Result $result): bool
 
     private function resultHasErrors(Result $result): bool
     {
-        if (1 === \count($result->getErrors()) && preg_match('/accepting valid new certificate/', $result->getErrors()[0])) {
+        if (1 === \count($result->getErrors()) && str_contains($result->getErrors()[0], 'accepting valid new certificate')) {
             // When calling getsysid with wrong PIN, we don't get any error message.
             // The only significant aspect of the error is that the output is just one line with
             // "accepting valid new certificate"

src/ContextXmlRenderer.php

@@ -121,7 +121,7 @@ private function renderMultiLineElement(DOMNodeList $nodes): string
         $lines = [];
         foreach ($nodes as $node) {
             $line = trim($node->nodeValue);
-            if (false !== strpos($line, '|')) {
+            if (str_contains($line, '|')) {
                 throw new RuntimeException('Unexpected character');
             }
             $lines[] = $line;

src/PinFile/PinFile.php

@@ -25,6 +25,6 @@ public function getFileName(): string
 
     public function getPath(): string
     {
-        return $this->dir . '/' . $this->getFileName();
+        return rtrim($this->dir, '/') . '/' . $this->getFileName();
     }
 }

src/Transaction.php

@@ -83,7 +83,7 @@ public function toArray(): array
                 'currency' => $this->getValue()->getCurrency()->getCode(),
                 'priceUnit' => 100,
             ],
-            'valutaDate' => $this->getValutaDate() ? $this->getValutaDate()->format('Y-m-d') : null,
+            'valutaDate' => $this->getValutaDate()?->format('Y-m-d'),
             'primaNota' => $this->getPrimaNota(),
             'customerReference' => $this->getCustomerReference(),
         ];

tests/Command/ShellCommandExecutorTest.php

@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Tests\Command;
 
 use AqBanking\Command\ShellCommandExecutor;

tests/ContextXmlRendererTest.php

@@ -15,6 +15,7 @@
 /**
  * @covers \AqBanking\ContextXmlRenderer
  * @uses \AqBanking\ContentXmlRenderer\MoneyElementRenderer
+ * @uses \AqBanking\Balance
  */
 class ContextXmlRendererTest extends TestCase
 {
@@ -78,9 +79,22 @@ public function testCanRenderTransactions()
         $this->assertEquals($expectedTransactions, $sut->getTransactions());
     }
 
-    /**
-     * @throws Exception
-     */
+    public function testCanRenderBalances()
+    {
+        $fixture = file_get_contents(__DIR__ . '/fixtures/test_context_file_transactions.xml');
+        $domDocument = new \DOMDocument();
+        $domDocument->loadXML($fixture);
+
+        $sut = new ContextXmlRenderer($domDocument);
+
+        $balances = $sut->getBalances();
+
+        $this->assertCount(3, $balances);
+        $this->assertInstanceOf(\DateTime::class, $balances[0]->getDate());
+        $this->assertInstanceOf(Money::class, $balances[0]->getValue());
+        $this->assertSame('temporary', $balances[0]->getType());
+    }
+
     public function testThrowsExceptionIfDataContainsReservedChar()
     {
         $fixture = file_get_contents(__DIR__ . '/fixtures/test_context_file_transactions_with_reserved_char.xml');

tests/PinFile/PinFileTest.php

@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace PinFile;
+namespace Tests\PinFile;
 
 use AqBanking\Bank;
 use AqBanking\BankCode;
@@ -20,30 +20,51 @@
  */
 class PinFileTest extends TestCase
 {
-    public function testPinFile(): void
+    private static string $userId = '1';
+
+    private static string $bankCode = '50050010';
+
+    /**
+     * @dataProvider samples
+     */
+    public function testPinFile(string $dir, User $user, string $expectedFileName, string $expectedPath): void
     {
-        $userId = '1';
-        $bankCode = '50050010';
+        $sut = new PinFile(
+            dir: $dir,
+            user: $user
+        );
+
+        $this->assertSame($expectedFileName, $sut->getFileName());
+        $this->assertSame($expectedPath, $sut->getPath());
+    }
 
+    public static function samples(): array
+    {
         $user = new User(
-            userId: $userId,
+            userId: self::$userId,
             userName: 'Max Mustermann',
             bank: new Bank(
-                bankCode: new BankCode($bankCode),
+                bankCode: new BankCode(self::$bankCode),
                 hbciUrl: 'https://fints.bank.de/fints',
                 hbciVersion: new HbciVersion('1.2.3'),
             )
         );
 
-        $dir = sys_get_temp_dir();
-        $sut = new PinFile(
-            dir: $dir,
-            user: $user
-        );
-
-        $expectedFileName = 'pinfile_' . $bankCode . '_' . $userId;
+        $expectedFileName = 'pinfile_' . self::$bankCode . '_' . self::$userId;
 
-        $this->assertSame($expectedFileName, $sut->getFileName());
-        $this->assertSame(implode('/', [$dir, $expectedFileName]), $sut->getPath());
+        return [
+            'trailing slash' => [
+                './',
+                $user,
+                $expectedFileName,
+                './' . $expectedFileName,
+            ],
+            'no trailing slash' => [
+                '/home',
+                $user,
+                $expectedFileName,
+                '/home/' . $expectedFileName,
+            ],
+        ];
     }
 }