fix: runtimepath always updates lua package.path

1 files changed, 74 insertions, 0 deletions

diff --git a/test/functional/ex_cmds/packadd_spec.lua b/test/functional/ex_cmds/packadd_spec.lua
new file mode 100644
index 0000000000..2b0810cf9b
--- /dev/null
+++ b/test/functional/ex_cmds/packadd_spec.lua
@@ -0,0 +1,74 @@
+local helpers = require('test.functional.helpers')(after_each)
+
+local clear = helpers.clear
+local eq = helpers.eq
+local exec_lua = helpers.exec_lua
+
+describe('packadd', function()
+  before_each(function()
+    -- Primarily taken from test/functional/legacy/packadd_spec.lua
+    clear()
+    exec_lua [[
+      TopDirectory = vim.fn.expand(vim.fn.getcwd() .. '/Xdir_lua')
+      PlugDirectory = TopDirectory .. '/pack/mine/opt/mytest'
+
+      vim.o.packpath = TopDirectory
+
+      function FindPathsContainingDir(dir)
+        return vim.fn.filter(
+          vim.split(package.path, ';'),
+          function(k, v)
+            return string.find(v, 'mytest') ~= nil
+          end
+        )
+      end
+    ]]
+  end)
+
+  after_each(function()
+    exec_lua [[
+      vim.fn.delete(TopDirectory, 'rf')
+    ]]
+  end)
+
+  it('should immediately update package.path in lua', function()
+    local count_of_paths = exec_lua [[
+      vim.fn.mkdir(PlugDirectory .. '/lua/', 'p')
+
+      local num_paths_before = #FindPathsContainingDir('mytest')
+
+      vim.cmd("packadd mytest")
+
+      local num_paths_after = #FindPathsContainingDir('mytest')
+
+      return { num_paths_before, num_paths_after }
+    ]]
+
+    eq({0, 2}, count_of_paths)
+  end)
+
+  it('should immediately update package.path in lua even if lua directory does not exist', function()
+    local count_of_paths = exec_lua [[
+      vim.fn.mkdir(PlugDirectory .. '/plugin/', 'p')
+
+      local num_paths_before = #FindPathsContainingDir('mytest')
+
+      vim.cmd("packadd mytest")
+
+      local num_paths_after = #FindPathsContainingDir('mytest')
+
+      return { num_paths_before, num_paths_after }
+    ]]
+
+    eq({0, 2}, count_of_paths)
+  end)
+
+  it('should error for invalid paths', function()
+    local count_of_paths = exec_lua [[
+      local ok, err = pcall(vim.cmd, "packadd asdf")
+      return ok
+    ]]
+
+    eq(false, count_of_paths)
+  end)
+end)