#23 multiple sheets fix

Author: Vedran

src/main/java/com/vgv/xls/XsWorkbook.java

@@ -145,7 +145,7 @@ public void saveTo(final String path) throws IOException {
 
     @Override
     public EWorkbook with(final ESheet sheet) {
-        return new XsWorkbook(this.sheets.with(sheet));
+        return new XsWorkbook(this.sheets.with(sheet), this.workbook);
     }
 
     @Override
@@ -154,7 +154,7 @@ public EWorkbook with(final Style style) {
         for (final ESheet sheet : this.sheets) {
             elements.add(sheet.with(style));
         }
-        return new XsWorkbook(elements);
+        return new XsWorkbook(elements, this.workbook);
     }
 
     /**

src/test/java/com/vgv/xls/XsWorkbookTest.java

@@ -86,4 +86,28 @@ public void createsWorkbookWithStyles() throws IOException {
             Matchers.equalTo(IndexedColors.GOLD.getIndex())
         );
     }
+
+    /**
+     * Creates workbook with multiple sheets.
+     * @throws IOException If fails
+     */
+    @Test
+    public void createsWorkbookWithMultipleSheets() throws IOException {
+        final String fsheet = "sheet1";
+        final String ssheet = "sheet2";
+        final Workbook wbook = new XsWorkbook()
+            .with(new XsSheet(new XsRow(new TextCell(fsheet))))
+            .with(new XsSheet(new XsRow(new TextCell(ssheet))))
+            .asWorkbook();
+        MatcherAssert.assertThat(
+            wbook.getSheetAt(0).getRow(1).getCell(0)
+                .getStringCellValue(),
+            Matchers.equalTo(fsheet)
+        );
+        MatcherAssert.assertThat(
+            wbook.getSheetAt(1).getRow(1).getCell(0)
+                .getStringCellValue(),
+            Matchers.equalTo(ssheet)
+        );
+    }
 }