make command to setup local tests (#426)

Makefile

@@ -1,10 +1,29 @@
+PACKER_DIR = ~/.local/share/nvim/site/pack/vendor/start
+
 test:
 	nvim --headless --noplugin -u lua/tests/minimal.vim -c "PlenaryBustedDirectory lua/tests/ {minimal_init = 'lua/tests/minimal.vim'}"
-localfailed:
+localfailed: localtestsetup
 	nvim --headless --noplugin -u lua/tests/init.vim -c "PlenaryBustedDirectory lua/tests/failed {minimal_init = 'lua/tests/init.vim'}"
-localtest:
+localtest: localtestsetup
 	nvim --headless --noplugin -u lua/tests/init.vim -c "PlenaryBustedDirectory lua/tests/ {minimal_init = 'lua/tests/init.vim'}"
-localtestfile:
+localtestfile: localtestsetup
 	nvim --headless --noplugin -u lua/tests/init.vim -c "PlenaryBustedFile lua/tests/go_comment_spec.lua"
 lint:
 	luacheck lua/go
+
+localtestsetup:
+	@mkdir -p $(PACKER_DIR)
+	@mkdir -p ~/tmp
+
+	@test -d $(PACKER_DIR)/plenary.nvim ||\
+		git clone --depth 1 https://github.com/nvim-lua/plenary.nvim $(PACKER_DIR)/plenary.nvim
+
+	@test -d $(PACKER_DIR)/nvim-lspconfig ||\
+		git clone --depth 1 https://github.com/neovim/nvim-lspconfig $(PACKER_DIR)/nvim-lspconfig
+
+	@test -d $(PACKER_DIR)/nvim-treesitter ||\
+		git clone --depth 1 https://github.com/nvim-treesitter/nvim-treesitter $(PACKER_DIR)/nvim-treesitter
+
+	@test -d $(PACKER_DIR)/go.nvim || ln -s ${shell pwd} $(PACKER_DIR)
+
+	nvim --headless -u lua/tests/minimal.vim -i NONE -c "TSUpdateSync go" -c "q"