refactor(tests): add minimal test for folding

Author: broken-pen

tests/plenary/org/fold_spec.lua

@@ -0,0 +1,17 @@
+local helpers = require('tests.plenary.helpers')
+
+describe('folding', function()
+  it('works', function()
+    helpers.create_file({
+      '* First',
+      '** Second',
+      '*** Third',
+      '**** Fourth',
+      '***** Fifth',
+      'text',
+    })
+    vim.cmd.normal({ 'GzM', bang = true })
+    local foldlevel = vim.fn.foldlevel(6)
+    assert.are.same(5, foldlevel)
+  end)
+end)