Fehlerpfade im PDF-Extraktionsadapter gezielt getestet

pdf-umbenenner-adapter-out/src/test/java/de/gecheckt/pdf/umbenenner/adapter/out/pdfextraction/PdfTextExtractionPortAdapterTest.java

@@ -14,6 +14,9 @@ import org.junit.jupiter.api.io.TempDir;
 
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.nio.file.attribute.PosixFilePermission;
+import java.util.HashSet;
+import java.util.Set;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
@@ -64,6 +67,54 @@ class PdfTextExtractionPortAdapterTest {
         assertTrue(error.errorMessage().contains("not found"));
     }
 
+    @Test
+    void testUnreadableFileReturnsTechnicalError() throws Exception {
+        // Create a PDF file
+        Path pdfFile = tempDir.resolve("unreadable.pdf");
+        createSimplePdf(pdfFile);
+        
+        // Make file unreadable (Unix-like systems)
+        try {
+            Set<PosixFilePermission> perms = new HashSet<>();
+            Files.setPosixFilePermissions(pdfFile, perms);
+        } catch (UnsupportedOperationException e) {
+            // On Windows, we can't easily make a file unreadable while keeping it existing
+            // So we'll skip this test on Windows by just returning early
+            return;
+        }
+
+        SourceDocumentCandidate candidate = new SourceDocumentCandidate(
+            "unreadable.pdf",
+            Files.size(pdfFile),
+            new SourceDocumentLocator(pdfFile.toAbsolutePath().toString())
+        );
+
+        PdfExtractionResult result = adapter.extractTextAndPageCount(candidate);
+
+        assertInstanceOf(PdfExtractionTechnicalError.class, result);
+        PdfExtractionTechnicalError error = (PdfExtractionTechnicalError) result;
+        assertTrue(error.errorMessage().contains("not readable"));
+    }
+
+    @Test
+    void testZeroPagePdfReturnsTechnicalError() throws Exception {
+        // Create a PDF with zero pages
+        Path pdfFile = tempDir.resolve("zero-pages.pdf");
+        createZeroPagePdf(pdfFile);
+
+        SourceDocumentCandidate candidate = new SourceDocumentCandidate(
+            "zero-pages.pdf",
+            Files.size(pdfFile),
+            new SourceDocumentLocator(pdfFile.toAbsolutePath().toString())
+        );
+
+        PdfExtractionResult result = adapter.extractTextAndPageCount(candidate);
+
+        assertInstanceOf(PdfExtractionTechnicalError.class, result);
+        PdfExtractionTechnicalError error = (PdfExtractionTechnicalError) result;
+        assertTrue(error.errorMessage().contains("zero pages"));
+    }
+
     @Test
     void testSimplePdfExtractionSuccess() throws Exception {
         // Create a simple single-page PDF
@@ -185,4 +236,14 @@ class PdfTextExtractionPortAdapterTest {
         document.save(filePath.toAbsolutePath().toString());
         document.close();
     }
+    
+    /**
+     * Creates a PDF with zero pages.
+     */
+    private void createZeroPagePdf(Path filePath) throws Exception {
+        PDDocument document = new PDDocument();
+        // Add no pages
+        document.save(filePath.toAbsolutePath().toString());
+        document.close();
+    }
 }