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You'll be prompted with the message "Enter keystore password:", which is usually "changeit" as a default value.
If you provide the correct password, the content of the certification file will be printed in the terminal.
You'll be prompted again with the message: "Trust this certificate? [no]:"
You have to type "yes" in order to confirm you trust the certification.
If everything is correct you get the message "Certificate was added to keystore".
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PS.: If you'd like to remove the certificate from Java keystore after you finished the test, you can do this by running this command:
keytool -delete -alias passman.co -keystore cacerts