What is the legal test for withdrawing a guilty plea?

When circumstances arise that call into question the validity of a plea of guilty, the presiding justice is empowered with a discretion to conduct an inquiry into whether the plea should be struck and the case proceed to trial. An inquiry conducted pursuant to Adgey v. The Queen (1973), 1973 CanLII 37 (SCC), 13 C.C.C. (2d) 177, focuses on the record, as amplified, which may potentially conflict with an unequivocal, voluntary and informed plea. There is no absolute or unrestricted right to have a guilty plea withdrawn. The onus, in the sense of the burden of persuasion, is upon the accused.