This is an Early Access feature for existing Workflows users. To enable it, use the Early Access Feature Manager as described in Manage Early Access and Beta features.
Connections are saved credentials that can be used to simplify the testing of flows. For many services, it is good practice to test your flows using multiple sets of credentials.
Builders can create a new connection from the Test dialog when testing their flow. They can also choose from a list of previously created connections. When creating a new connection, it is good practice to give it a distinct nickname that includes information about which credentials have been used. For example,
Jonathan - Developer account basic.
Builders can create and save connections to use when testing their connectors. After clicking the Test button while building a flow, a Create a test connection link will display in the test dialog. Clicking on this link will run the authentication defined in the connector project.