completion/alias: rename

There is no reason for this to be in the `plugins` directory, it just needs to have a load priority sufficiently high that it runs after any aliases are defined.

test/completion/aliases.completion.bats

@@ -0,0 +1,27 @@
+#!/usr/bin/env bats
+
+load ../test_helper
+load ../test_helper_libs
+
+load ../../completion/available/capistrano.completion
+
+@test "alias-completion: See that aliases with double quotes and brackets do not break the plugin" {
+  alias gtest="git log --graph --pretty=format:'%C(bold)%h%Creset%C(magenta)%d%Creset %s %C(yellow)<%an> %C(cyan)(%cr)%Creset' --abbrev-commit --date=relative"
+  load ../../plugins/available/alias-completion.plugin
+
+  assert_success
+}
+
+@test "alias-completion: See that aliases with single quotes and brackets do not break the plugin" {
+  alias gtest='git log --graph --pretty=format:"%C(bold)%h%Creset%C(magenta)%d%Creset %s %C(yellow)<%an> %C(cyan)(%cr)%Creset" --abbrev-commit --date=relative'
+  load ../../plugins/available/alias-completion.plugin
+
+  assert_success
+}
+
+@test "alias-completion: See that having aliased rm command does not output unnecessary output" {
+  alias rm='rm -v'
+  load ../../plugins/available/alias-completion.plugin
+
+  refute_output
+}