Setup: create a course go to grades tab select import in the dropdown menu grader report Test the first step form with an invalid csv file : import the following csv file or use the following file invalid-import-step-1.csv : column1 foo,bar keep default values and submit the form with "upload grades" button Confirm you see this error message " Invalid CSV file format - number of columns is not constant! " press "continue" button Confirm you are redirected to "import csv" page Test the second step form with invalid data: import the following csv file or use the following file invalid-import-step-2.csv : userid,grade 10000025,75 Note: This must be an integer of a user that does not exist to avoid cross DB errors from interrupting the test keep default values and submit the form with "upload grades" button you should see another form named "import preview" keep default values and submit the form with "upload grades" button Confirm see 2 error messages : "User mapping error: Could not find user with id of "10000025"." and "Import failed. No data was imported." press "continue" button Confirm you are redirected to "import csv" page