diff --git a/src/testdir/test_join.vim b/src/testdir/test_join.vim
new file mode 100644
index 0000000..8a028f1
--- /dev/null
+++ b/src/testdir/test_join.vim
@@ -0,0 +1,13 @@
+" Test for joining lines.
+
+func Test_join_with_count()
+  new
+  call setline(1, ['one', 'two', 'three', 'four'])
+  normal J
+  call assert_equal('one two', getline(1))
+  %del
+  call setline(1, ['one', 'two', 'three', 'four'])
+  normal 10J
+  call assert_equal('one two three four', getline(1))
+  quit!
+endfunc