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

1 files changed, 38 insertions, 0 deletions

diff --git a/test/functional/editor/tabpage_spec.lua b/test/functional/editor/tabpage_spec.lua
new file mode 100644
index 0000000000..d1d6854b07
--- /dev/null
+++ b/test/functional/editor/tabpage_spec.lua
@@ -0,0 +1,38 @@
+local helpers = require('test.functional.helpers')(after_each)
+
+local clear = helpers.clear
+local command = helpers.command
+local eq = helpers.eq
+local feed = helpers.feed
+local eval = helpers.eval
+
+describe('tabpage', function()
+  before_each(clear)
+
+  it('advances to the next page via <C-W>gt', function()
+    -- add some tabpages
+    command('tabnew')
+    command('tabnew')
+    command('tabnew')
+
+    eq(4, eval('tabpagenr()'))
+
+    feed('<C-W>gt')
+
+    eq(1, eval('tabpagenr()'))
+  end)
+
+  it('retreats to the previous page via <C-W>gT', function()
+    -- add some tabpages
+    command('tabnew')
+    command('tabnew')
+    command('tabnew')
+
+    eq(4, eval('tabpagenr()'))
+
+    feed('<C-W>gT')
+
+    eq(3, eval('tabpagenr()'))
+  end)
+end)
+