test: add regression test for AdaptingZipReader buffer loop

Author: TheWakz

src/test/java/software/coley/lljzip/AdaptingZipReaderTests.java

@@ -0,0 +1,52 @@
+package software.coley.lljzip;
+
+import org.junit.jupiter.api.Test;
+import software.coley.lljzip.format.model.ZipArchive;
+import software.coley.lljzip.format.read.AdaptingZipReader;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.zip.CRC32;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipOutputStream;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * Tests for {@link AdaptingZipReader} targeting buffer loop regressions.
+ *
+ * @author TheWakz
+ */
+public class AdaptingZipReaderTests {
+
+    @Test
+    public void testReadArchiveExceedingBufferSize() throws IOException {
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        try (ZipOutputStream zos = new ZipOutputStream(baos)) {
+            byte[] dummyData = new byte[20 * 1024];
+
+            ZipEntry entry = new ZipEntry("large_entry.txt");
+            entry.setMethod(ZipEntry.STORED);
+            entry.setSize(dummyData.length);
+            entry.setCompressedSize(dummyData.length);
+
+            CRC32 crc = new CRC32();
+            crc.update(dummyData);
+            entry.setCrc(crc.getValue());
+
+            zos.putNextEntry(entry);
+            zos.write(dummyData);
+            zos.closeEntry();
+        }
+        byte[] zipBytes = baos.toByteArray();
+
+        assertTrue(zipBytes.length > 16384, "Test archive size must exceed 16KB");
+
+        ZipArchive archive = assertDoesNotThrow(() -> ZipIO.read(zipBytes, new AdaptingZipReader()),
+                "Failed to read with read(adapting) when size exceeds buffer");
+
+        assertNotNull(archive, "Archive is null");
+        assertNotNull(archive.getLocalFileByName("large_entry.txt"),
+                "Missing 'large_entry.txt' file due to truncation");
+    }
+}