[PATCH] test: use (format "%S") to print nil in emacs test.

[Tomi Ollila]

On Fri, Aug 31 2012, Austin Clements <amdragon at MIT.EDU> wrote:

> LGTM.  Alternatively, the test could be
>   (null (notmuch-wash....))
> with the correct answer being 't'.  That would avoid the awkward
> detour through a string, but either way is good as long as this test
> passes.

I was going to vote this (null ... thing) but as the function returns
nil when no match found it is more obvious th compare for that instead
of "t".

And, there is not much of a detour for the expected value nil, outputted
as "nil" (without quotes) :).

So: 

LGTM. "Alternatively, the test could" use (prin1 (...)) directly,
"but either way is good as long as this test passes."

Tomi

>
> Quoth david at tethera.net on Aug 30 at 10:09 pm:
>> From: David Bremner <bremner at debian.org>
>> 
>> The behaviour of "emacsclient --eval nil" changed from emacs23 to
>> emacs24, and in emacs24 it prints 'nil' rather than an empty string.
>> 
>> (format "%S" foo) produces a sexpr form of foo, and is consistent
>> between the two versions.
>> ---
>> 
>> This fixes another test failure on emacs24. 
>> 
>> I guess maybe all test_emacs output could be canonicalized this way,
>> but I suspect that would be pretty disruptive.
>> 
>>  test/emacs-subject-to-filename |    6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
>> 
>> diff --git a/test/emacs-subject-to-filename b/test/emacs-subject-to-filename
>> index 176e685..a0ffdfe 100755
>> --- a/test/emacs-subject-to-filename
>> +++ b/test/emacs-subject-to-filename
>> @@ -8,10 +8,10 @@ test_emacs '(ignore)'
>>  
>>  # test notmuch-wash-subject-to-patch-sequence-number (subject)
>>  test_begin_subtest "no patch sequence number"
>> -output=$(test_emacs '(notmuch-wash-subject-to-patch-sequence-number
>> -      "[PATCH] A normal patch subject without numbers")'
>> +output=$(test_emacs '(format "%S" (notmuch-wash-subject-to-patch-sequence-number
>> +      "[PATCH] A normal patch subject without numbers"))'
>>  )
>> -test_expect_equal "$output" ""
>> +test_expect_equal "$output" '"nil"'
>>  
>>  test_begin_subtest "patch sequence number #1"
>>  output=$(test_emacs '(notmuch-wash-subject-to-patch-sequence-number
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