legacy tests: migrate test46

src/nvim/testdir/test46.in

@@ -1,27 +0,0 @@
-Tests for multi-line regexps with ":s". vim: set ft=vim :
-
-STARTTEST
-:" test if replacing a line break works with a back reference
-:/^1/,/^2/s/\n\(.\)/ \1/
-:" test if inserting a line break works with a back reference
-:/^3/,/^4/s/\(.\)$/\r\1/
-:" test if replacing a line break with another line break works
-:/^5/,/^6/s/\(\_d\{3}\)/x\1x/
-:/^1/,$w! test.out
-:qa!
-ENDTEST
-
-1 aa
-bb
-cc
-2 dd
-ee
-3 ef
-gh
-4 ij
-5 a8
-8b c9
-9d
-6 e7
-77f
-xxxxx

src/nvim/testdir/test46.ok

@@ -1,13 +0,0 @@
-1 aa bb cc 2 dd ee
-3 e
-f
-g
-h
-4 i
-j
-5 ax8
-8xb cx9
-9xd
-6 ex7
-7x7f
-xxxxx

test/functional/legacy/046_multi_line_regexps_spec.lua

@@ -0,0 +1,52 @@
+-- vim: set foldmethod=marker foldmarker=[[,]] :
+-- Tests for multi-line regexps with ":s"
+
+local helpers = require('test.functional.helpers')
+local clear, feed, insert = helpers.clear, helpers.feed, helpers.insert
+local execute, expect = helpers.execute, helpers.expect
+
+describe('multi-line regexp', function()
+  setup(clear)
+
+  it('is working', function()
+    insert([[
+      1 aa
+      bb
+      cc
+      2 dd
+      ee
+      3 ef
+      gh
+      4 ij
+      5 a8
+      8b c9
+      9d
+      6 e7
+      77f
+      xxxxx]])
+
+    -- Test if replacing a line break works with a back reference
+    feed([[:/^1/,/^2/s/\n\(.\)/ \1/<cr>]])
+
+    -- Test if inserting a line break works with a back reference
+    feed([[:/^3/,/^4/s/\(.\)$/\r\1/<cr>]])
+
+    -- Test if replacing a line break with another line break works
+    feed([[:/^5/,/^6/s/\(\_d\{3}\)/x\1x/<cr>]])
+
+    expect([[
+      1 aa bb cc 2 dd ee
+      3 e
+      f
+      g
+      h
+      4 i
+      j
+      5 ax8
+      8xb cx9
+      9xd
+      6 ex7
+      7x7f
+      xxxxx]])
+  end)
+end)