This closes #744, the `Save`, `Write` and `WriteTo` function accept saving options

1 files changed, 8 insertions, 0 deletions

diff --git a/file_test.go b/file_test.go
index 8e65c5d..83a9b78 100644
--- a/file_test.go
+++ b/file_test.go
@@ -71,6 +71,14 @@ func TestWriteTo(t *testing.T) {
 		_, err := f.WriteTo(bufio.NewWriter(&buf))
 		assert.EqualError(t, err, "zip: FileHeader.Name too long")
 	}
+	// Test write with unsupported workbook file format
+	{
+		f, buf := File{Pkg: sync.Map{}}, bytes.Buffer{}
+		f.Pkg.Store("/d", []byte("s"))
+		f.Path = "Book1.xls"
+		_, err := f.WriteTo(bufio.NewWriter(&buf))
+		assert.EqualError(t, err, ErrWorkbookFileFormat.Error())
+	}
 }
 
 func TestClose(t *testing.T) {