# Functions
HandleGetExtensionSuccessfully creates an HTTP handler at `/extensions/agent` that responds with a JSON payload corresponding to SingleExtension.
HandleListExtensionsSuccessfully creates an HTTP handler at `/extensions` on the test handler mux that response with a list containing a single tenant.
# Constants
GetOutput provides a single Extension result.
ListOutput provides a single page of Extension results.
# Variables
ExpectedExtensions is a slice containing the Extension that should be parsed from ListOutput.
ListedExtension is the Extension that should be parsed from ListOutput.
SingleExtension is the Extension that should be parsed from GetOutput.