legacy tests: migrate test81

src/nvim/testdir/test81.in

@@ -1,22 +0,0 @@
-Test for t movement command and 'cpo-;' setting
-
-STARTTEST
-:set nocompatible viminfo+=nviminfo
-:set cpo-=;
-/firstline/
-j0tt;D
-0fz;D
-$Fy;D
-$Ty;D:set cpo+=;
-j0tt;;D
-$Ty;;D:?firstline?+1,$w! test.out
-:qa!
-ENDTEST
-
-firstline
-aaa two three four
-    zzz
-yyy   
-bbb yee yoo four
-ccc two three four
-ddd yee yoo four

src/nvim/testdir/test81.ok

@@ -1,6 +0,0 @@
-aaa two
-    z
-y
-bbb y
-ccc
-ddd yee y

test/functional/legacy/081_coptions_movement_spec.lua

@@ -0,0 +1,39 @@
+-- Test for t movement command and 'cpo-;' setting
+
+local helpers = require('test.functional.helpers')
+local clear, feed, insert = helpers.clear, helpers.feed, helpers.insert
+local execute, expect = helpers.execute, helpers.expect
+
+describe('coptions', function()
+  setup(clear)
+
+  it('is working', function()
+    insert([[
+      aaa two three four
+          zzz
+      yyy   
+      bbb yee yoo four
+      ccc two three four
+      ddd yee yoo four]])
+
+    execute('set cpo-=;')
+
+    feed('gg0tt;D')
+    feed('j0fz;D')
+    feed('j$Fy;D')
+    feed('j$Ty;D')
+
+    execute('set cpo+=;')
+
+    feed('j0tt;;D')
+    feed('j$Ty;;D')
+    
+    expect([[
+      aaa two
+          z
+      y
+      bbb y
+      ccc
+      ddd yee y]])
+  end)
+end)