chore: plenary tests POC: harden directories

tests/minimal_init.lua

@@ -1,8 +1,8 @@
--- this file is necessary for the minimal_init option which directs the spawned nvim test instances be run with --noplugin
-
--- ensure that this nvim-tree is not overridden by installed versions in .local/share/nvim/site etc.
-vim.o.runtimepath = vim.env.REPO_DIR .. "," .. vim.o.runtimepath
-
--- plenary will append ,.,$HOME/src/nvim-tree/master/plenary.nvim in the spawned test instances, however we want this here to prevent overrides
-vim.o.runtimepath = vim.env.PLENARY_DIR .. "," .. vim.o.runtimepath
-
+-- Prepend these as plenary appends a "." and plenary directory
+-- The spawned processes don't specify --clean so contain the full ~/.local runtime path
+vim.o.runtimepath = string.format(
+  "%s,%s,%s",
+  vim.env.DIR_REPO,
+  vim.env.DIR_PLENARY,
+  vim.o.runtimepath
+)

tests/test_init.lua

@@ -0,0 +1,7 @@
+local test_harness = require('plenary.test_harness')
+
+local DIR_TEST = vim.env.DIR_REPO .. '/tests'
+local FILE_MINIMAL_INIT = DIR_TEST .. '/minimal_init.lua'
+
+test_harness.test_directory(DIR_TEST, { minimal_init = FILE_MINIMAL_INIT })
+