Dominique wrote:

> Bram Moolenaar <[email protected]> wrote:
> 
> > Patch 8.2.0212
> > Problem:    Missing search/substitute pattern hardly tested.
> > Solution:   Add test_clear_search_pat() and tests. (Yegappan Lakshmanan,
> >             closes #5579)
> > Files:      runtime/doc/eval.txt, runtime/doc/testing.txt,
> >             runtime/doc/usr_41.txt, src/evalfunc.c, src/proto/regexp.pro,
> >             src/proto/search.pro, src/proto/testing.pro, src/regexp.c,
> >             src/search.c, src/testdir/test_quickfix.vim,
> >             src/testdir/test_search.vim, src/testdir/test_sort.vim,
> >             src/testdir/test_substitute.vim, src/testing.c
> >
> >
> > *** ../vim-8.2.0211/runtime/doc/eval.txt        2020-01-26 
> > 15:52:33.011833294 +0100
> > --- runtime/doc/eval.txt        2020-02-05 20:14:30.082087884 +0100
> > ***************
> > *** 2846,2851 ****
> > --- 2848,2854 ----
> >   test_alloc_fail({id}, {countdown}, {repeat})
> >                                 none    make memory allocation fail
> >   test_autochdir()              none    enable 'autochdir' during startup
> > + test_clear_search_pat()               none    clears the last used search 
> > pattern
> >   test_feedinput({string})      none    add key sequence to input buffer
> >   test_garbagecollect_now()     none    free memory right now for testing
> >   test_garbagecollect_soon()    none    free memory soon for testing
> 
> 
> Couldn't we test the missing last search pattern by using the
> existing  :call histdel('/', '.*')  in tests, instead of by introducing
> a new function test_clear_search_pat()?

histdel() only clears the command line history, not the search pattern.

This comes closer, but also doesn't work:
        :let @/ = test_null_string()

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