What is the legal test for refusing to remove counsel as solicitor of record?

[12] The court has the authority to refuse counsel’s request to be removed as solicitor of record, but the authority must be exercised sparingly and only when necessary to prevent serious harm to the administration of justice. See The Queen v. Cunningham, 2010 SCC 10, [2010] 1 S.C.R. 331, 399 N.R. 326, 283 B.C.A.C. 280, 480 W.A.C. 280, 317 D.L.R. (4th) 1, 254 C.C.C. (3d) 1, 73 C.R. (6th) 1, [2010] S.C.J. No. 10, 2010 Cars­well­Yukon 21.

[13] In The Queen v. Cunningham, the court discussed the reasons in favour of courts’ exercising their jurisdiction to refuse a counsel’s request to be removed as solicitor of record in paragraph 22 as follows: