test: reorg #15698

Problem:
Subdirectories like "visual", "insert", "normal" encourage people to
separate *related* tests for no good reason.  Typically the _mode_ is
not the relevant topic of a test (and when it is, _then_ create
an appropriate describe() or it()).

Solution:
- Delete the various `test/functional/<mode>/` subdirectories, move
  their tests to more meaningful topics.
- Rename `…/normal/` to `…/editor/`.
  - Move or merge `…/visual/*` and `…/insert/*` tests into here where
    appropriate.
- Rename `…/eval/` to `…/vimscript/`.
  - Move `…/viml/*` into here also.

* test(reorg): insert/* => editor/mode_insert_spec.lua
* test(reorg): cmdline/* => editor/mode_cmdline_spec.lua
* test(reorg): eval core tests => eval_spec.lua

test/functional/vimscript/glob_spec.lua

@@ -0,0 +1,28 @@
+local lfs = require('lfs')
+local helpers = require('test.functional.helpers')(after_each)
+local clear, command, eval, eq = helpers.clear, helpers.command, helpers.eval, helpers.eq
+
+before_each(function()
+  clear()
+  lfs.mkdir('test-glob')
+
+  -- Long path might cause "Press ENTER" prompt; use :silent to avoid it.
+  command('silent cd test-glob')
+end)
+
+after_each(function()
+  lfs.rmdir('test-glob')
+end)
+
+describe('glob()', function()
+  it("glob('.*') returns . and .. ", function()
+    eq({'.', '..'}, eval("glob('.*', 0, 1)"))
+    -- Do it again to verify scandir_next_with_dots() internal state.
+    eq({'.', '..'}, eval("glob('.*', 0, 1)"))
+  end)
+  it("glob('*') returns an empty list ", function()
+    eq({}, eval("glob('*', 0, 1)"))
+    -- Do it again to verify scandir_next_with_dots() internal state.
+    eq({}, eval("glob('*', 0, 1)"))
+  end)
+end)