cleanup - do not throw checked exception

kop-common-test/src/main/java/de/itvsh/kop/common/test/TestUtils.java

@@ -64,9 +64,13 @@ public class TestUtils {
 		return Objects.isNull(str) ? "null" : String.format("\"%s\"", str);
 	}
 
-	public static byte[] contentStreamToByteArray(InputStream contentStream) throws IOException {
+	public static byte[] contentStreamToByteArray(InputStream contentStream) {
 		var outputStream = new ByteArrayOutputStream();
+		try {
 			IOUtils.copy(contentStream, outputStream);
+		} catch (IOException e) {
+			throw new RuntimeException("Error on reading stream", e);
+		}
 
 		return outputStream.toByteArray();
 	}