add integration testing helpers

closes #4

Author: dm1try

lib/mix/tasks/build_host.ex

@@ -19,7 +19,7 @@ defmodule Mix.Tasks.Nvim.BuildHost do
 
     session_opts =
       opts
-      |> Keyword.take([:xdg_home_path, :vim_rc_path])
+      |> Keyword.take([:xdg_home_path, :xdg_data_path, :vim_rc_path, :nvim_rplugin_manifest])
       |> Keyword.put_new(:vim_rc_path, Path.expand("../../init.vim"))
 
     EmbedNVim.start_link([session_name: @nvim_session] ++ session_opts)

lib/nvim/session/embed.ex

@@ -3,7 +3,8 @@ defmodule NVim.Session.Embed do
 
   @params_to_env [xdg_home_path: 'XDG_CONFIG_HOME',
                   xdg_data_path: 'XDG_DATA_PATH',
-                  vim_rc_path: 'MYVIMRC']
+                  vim_rc_path: 'MYVIMRC',
+                  nvim_rplugin_manifest: 'NVIM_RPLUGIN_MANIFEST']
 
   defmodule NullHandler do
     require Logger

lib/nvim/test/integration.ex

@@ -1,14 +1,26 @@
 defmodule NVim.Test.Integration do
-  def setup_host(fixtures_path) do
+  import Mix.Generator, only: [create_file: 3]
+
+  def setup_host(fixtures_path, init_rc_content \\ "") do
+    File.mkdir_p! "#{fixtures_path}/xdg_home"
+    File.mkdir_p! "#{fixtures_path}/xdg_data"
+
+    nvim_config_path = "#{fixtures_path}/xdg_home/nvim"
+
+    create_file "#{nvim_config_path}/init.vim", init_rc_content, force: true
+    System.cmd "mix", ["nvim.install", nvim_config_path]
+  end
+
+  def start_host_session(fixtures_path, session_name \\ IntegrationTest.Session) do
+    NVim.Session.Embed.start_link(session_name: session_name,
+                                  xdg_home_path: "#{fixtures_path}/xdg_home",
+                                  xdg_data_path: "#{fixtures_path}/xdg_data",
+                                  vim_rc_path: "#{fixtures_path}/xdg_home/nvim/init.vim",
+                                  nvim_rplugin_manifest: "#{fixtures_path}/xdg_data/rplugin.vim")
+  end
+
+  def remove_host(fixtures_path) do
     nvim_config_path = "#{fixtures_path}/xdg_home/nvim"
-    Mix.Tasks.Nvim.Install.run [nvim_config_path]
-
-    File.cd! "#{nvim_config_path}/rplugin/elixir/apps/host", fn->
-      Mix.Tasks.Nvim.BuildHost.run [
-        "nvim.build_host",
-        "--xdg-home-path", "#{fixtures_path}/xdg_home",
-        "--vim-rc-path", "#{nvim_config_path}/init.vim"
-      ]
-    end
+    System.cmd "mix", ["nvim.remove", nvim_config_path]
   end
 end