When you creating new DataSource in WLS, it allows you to test the connectivity. However after you have created it, the test button is kinda hidden in a non-obvious way. This is how I get to it and test an existing DataSource that have targeted a server.
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Login to Admin Console (eg: http://localhost:7100/console)
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On the Domain Structure left panel, click:
<my\_domain\_name>(eg: DefaultDomain) > Services > Data Sources -
On the right, Click on the DataSource name you want to test.
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Click the "Monitoring" tab > "Testing" tab.
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Select the server the DataSource has targeted to and then press "Test Data Source" button.
