Add pre_commit_run test for finding LCA when other branch is an ancestor

		expect = ["run", "more", "arguments", "--all-files"]

		self.assertListEqual(expect, args)

	def test_comparison_branch_is_ancestor(self) -> None:

		"""

		Check find_lca works when the branch to assess against is a direct ancestor

		Regression test for an issue where an error was reported when calling:

			git fetch <repo> --shallow-exclude=<ancestor> <current-branch>

		Depending on transport the error was:

			ssh or file: "fatal: no commits selected for shallow requests"

			http: "fatal: error processing shallow info: 4"

		"""

		args, env = self.run_script(

			MAIN,

			CI_MERGE_REQUEST_TARGET_BRANCH_NAME=LCA,

		)

		lca = self.branches[LCA]

		expect = ["run", f"--from-ref={lca.head}", f"--to-ref={env['CI_COMMIT_SHA']}"]

		self.assertListEqual(expect, args)