If you press the Test Connection for a OBIEE data source (with BI connector) and nothing happens, please verify the following:
1. Review and confirm if you have configured BI connector in the Tableau Server as mentioned in this support article:
Tableau Server: Unable to publish and view the worksheet, I see a spinning wheel.
2. If BI connector is activated correctly in the server (as per #1 above), then it is ok if you are not able to test connection in Tableau Server. Please proceed to create a workbook in the server using the <chart icon>+ next to the data source name header. Please verify if you are able to create a workbook using the data source.
If both the above steps do not help resolve your issue, please contact us at support@biconnector.com to schedule a web conference session to help you get past this issue.