Improve testing with plugin repositories

[acidghost]

Is your feature request related to a problem? Please describe

As mentioned in #1507 some features need actually remote repositories for their tests to be complete.

This example only tests for repo "remote" URL that is a local folder, doesn't test other forms of URLs (http, ssh):

asdf/test/asdf_nu.bats

Lines 102 to 115 in 05a8bb9

	@test "parses the output of asdf plugin list --urls" {
	setup_repo
	install_mock_plugin_repo "dummy"
	asdf plugin add "dummy" "${BASE_DIR}/repo-dummy"
	run_nushell "asdf plugin list --urls | to csv -n"
	[ "$status" -eq 0 ]
	local repo_url
	repo_url=$(get_plugin_remote_url "dummy")
	[ "$output" = "dummy,$repo_url" ]
	}

A similar thing also happens here:

asdf/test/asdf_nu.bats

Lines 150 to 160 in 05a8bb9

	@test "parses the output of asdf plugin list all" {
	setup_repo
	install_dummy_plugin
	run_nushell "asdf plugin list all | to csv -n"
	[ "$status" -eq 0 ]
	[ "$output" = "\
	bar,false,http://example.com/bar
	dummy,true,http://example.com/dummy
	foo,false,http://example.com/foo" ]
	}

Describe the proposed solution

One solution would be to have dummy remote repositories that are cloned in different ways.
ATM the dummy repository is exclusively cloned from a local directory.

Another solution is to manually add a fake "remote origin" (e.g. git remote remove origin && git remote add origin http://example.com); branch and ref can be faked as they are now.

Describe similar asdf features and why they are not sufficient

n/a

Describe other workarounds you've considered

n/a

[jthegedus]

Is this what you mean when you say "fake remote origin"?

asdf/test/update_command.bats

Line 10 in 05a8bb9

git --git-dir "$ASDF_DIR/.git" remote add origin https://github.com/asdf-vm/asdf.git

[acidghost]

Yes, precisely! This would enable testing different URL formats in the first example I provided.

For the second one example I think the only way is to add more plugins (with different URL formats) to the dummy_plugins_repo.