Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_26010857_13 (stage VARCHAR, teams_classification VARCHAR)

### Question ###
What is the number of stages where the teams classification leader is Cervélo Testteam?

### Accurate SQL ###

SELECT COUNT(stage) FROM table_26010857_13 WHERE teams_classification = "Cervélo TestTeam"