add limits for total columns, row and filename length

1 files changed, 4 insertions, 1 deletions

diff --git a/lib_test.go b/lib_test.go
index 0e717b2..229412c 100644
--- a/lib_test.go
+++ b/lib_test.go
@@ -23,7 +23,6 @@ var validColumns = []struct {
 	{Name: "AZ", Num: 26 + 26},
 	{Name: "ZZ", Num: 26 + 26*26},
 	{Name: "AAA", Num: 26 + 26*26 + 1},
-	{Name: "ZZZ", Num: 26 + 26*26 + 26*26*26},
 }
 
 var invalidColumns = []struct {
@@ -72,6 +71,8 @@ func TestColumnNameToNumber_Error(t *testing.T) {
 			assert.Equalf(t, col.Num, out, msg, col.Name)
 		}
 	}
+	_, err := ColumnNameToNumber("XFE")
+	assert.EqualError(t, err, "column number exceeds maximum limit")
 }
 
 func TestColumnNumberToName_OK(t *testing.T) {
@@ -172,6 +173,8 @@ func TestCellNameToCoordinates_Error(t *testing.T) {
 			assert.Equalf(t, -1, r, msg, cell)
 		}
 	}
+	_, _, err := CellNameToCoordinates("A1048577")
+	assert.EqualError(t, err, "row number exceeds maximum limit")
 }
 
 func TestCoordinatesToCellName_OK(t *testing.T) {