legacy tests: migrate test41

src/nvim/testdir/test41.in

@@ -1,24 +0,0 @@
-Test for writing and reading a file of over 100 Kbyte
-
-1 line: "This is the start"
-3001 lines: "This is the leader"
-1 line: "This is the middle"
-3001 lines: "This is the trailer"
-1 line: "This is the end"
-
-STARTTEST
-:%d
-aThis is the start
-This is the leader
-This is the middle
-This is the trailer
-This is the endkY3000p2GY3000p
-:w! Xtest
-:%d
-:e! Xtest
-:.w! test.out
-3003G:.w >>test.out
-6005G:.w >>test.out
-:qa!
-ENDTEST
-

src/nvim/testdir/test41.ok

@@ -1,3 +0,0 @@
-This is the start
-This is the middle
-This is the end

test/functional/legacy/041_writing_and_reading_hundred_kbyte_spec.lua

@@ -0,0 +1,40 @@
+-- Test for writing and reading a file of over 100 Kbyte
+
+local helpers = require('test.functional.helpers')
+local clear, feed, insert = helpers.clear, helpers.feed, helpers.insert
+local execute, expect = helpers.execute, helpers.expect
+
+describe('writing and reading a file of over 100 Kbyte', function()
+  setup(clear)
+
+  it('is working', function()
+    insert([[
+      This is the start
+      This is the leader
+      This is the middle
+      This is the trailer
+      This is the end]])
+
+    feed('kY3000p2GY3000p')
+
+    execute('w! test.out')
+    execute('%d')
+    execute('e! test.out')
+    execute('yank A')
+    execute('3003yank A')
+    execute('6005yank A')
+    execute('%d')
+    execute('0put a')
+    execute('1d | $d')
+    execute('w!')
+
+    expect([[
+      This is the start
+      This is the middle
+      This is the end]])
+  end)
+
+  teardown(function()
+    os.remove('test.out')
+  end)
+end)