Renamed file used in test-case for invalid excel content.

Author: Robin Duda

src/test/java/TestParser.java

@@ -18,7 +18,7 @@
 public class TestParser {
     public static final String TEST_XLSX_FILE = "src/test/java/test.xlsx";
     public static final String TEST_XLS_FILE = "src/test/java/test.xls";
-    public static final String TEST_INVALID_FILE = "src/test/java/test_invalid.xlsx";
+    public static final String TEST_INVALID_FILE = "src/test/java/invalid.xlsx";
     public static final int ROW_OFFSET = 5;
     private static final String XLSX = ".xlsx";