This closes qax-os#1945, an error will be return if column header cell is empty in pivot table data range

- Update unit tests

Author: xuri

pivotTable.go

@@ -260,6 +260,9 @@ func (f *File) getTableFieldsOrder(opts *PivotTableOptions) ([]string, error) {
 		if err != nil {
 			return order, err
 		}
+		if name == "" {
+			return order, ErrParameterInvalid
+		}
 		order = append(order, name)
 	}
 	return order, nil
@@ -272,8 +275,10 @@ func (f *File) addPivotCache(opts *PivotTableOptions) error {
 	if err != nil {
 		return newPivotTableDataRangeError(err.Error())
 	}
-	// data range has been checked
-	order, _ := f.getTableFieldsOrder(opts)
+	order, err := f.getTableFieldsOrder(opts)
+	if err != nil {
+		return newPivotTableDataRangeError(err.Error())
+	}
 	topLeftCell, _ := CoordinatesToCellName(coordinates[0], coordinates[1])
 	bottomRightCell, _ := CoordinatesToCellName(coordinates[2], coordinates[3])
 	pc := xlsxPivotCacheDefinition{

pivotTable_test.go

@@ -300,6 +300,7 @@ func TestPivotTable(t *testing.T) {
 	assert.EqualError(t, err, `parameter 'DataRange' parsing error: parameter is required`)
 	// Test add pivot table with unsupported charset content types.
 	f = NewFile()
+	assert.NoError(t, f.SetSheetRow("Sheet1", "A1", &[]string{"Month", "Year", "Type", "Sales", "Region"}))
 	f.ContentTypes = nil
 	f.Pkg.Store(defaultXMLPathContentTypes, MacintoshCyrillicCharset)
 	assert.EqualError(t, f.AddPivotTable(&PivotTableOptions{
@@ -393,6 +394,25 @@ func TestPivotTableDataRange(t *testing.T) {
 	f.Relationships.Delete("xl/worksheets/_rels/sheet1.xml.rels")
 	f.Pkg.Delete("xl/worksheets/_rels/sheet1.xml.rels")
 	assert.EqualError(t, f.DeletePivotTable("Sheet1", "PivotTable1"), "table PivotTable1 does not exist")
+
+	t.Run("data_range_with_empty_column", func(t *testing.T) {
+		// Test add pivot table with data range doesn't organized as a list with labeled columns
+		f := NewFile()
+		// Create some data in a sheet
+		month := []string{"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}
+		types := []string{"Meat", "Dairy", "Beverages", "Produce"}
+		assert.NoError(t, f.SetSheetRow("Sheet1", "A1", &[]string{"Month", "", "Type"}))
+		for row := 2; row < 32; row++ {
+			assert.NoError(t, f.SetCellValue("Sheet1", fmt.Sprintf("A%d", row), month[rand.Intn(12)]))
+			assert.NoError(t, f.SetCellValue("Sheet1", fmt.Sprintf("C%d", row), types[rand.Intn(4)]))
+		}
+		assert.Equal(t, newPivotTableDataRangeError("parameter is invalid"), f.AddPivotTable(&PivotTableOptions{
+			DataRange:       "Sheet1!A1:E31",
+			PivotTableRange: "Sheet1!G2:M34",
+			Rows:            []PivotTableField{{Data: "Month", DefaultSubtotal: true}},
+			Data:            []PivotTableField{{Data: "Type"}},
+		}))
+	})
 }
 
 func TestParseFormatPivotTableSet(t *testing.T) {