Clean up tests

tests/.gitignore

 # Automatically generated by 'make ignore'
 /*.out
 /gen/
-alloc
 args
 arpainet
-asctime
 assert
-atof
-atoi
-brk
-chdir
-create
 ctype
-dup
-env
 error
-exec
-fchdir
-fcntl
-fsync
-ftruncate
-getc_unget
-gethostname
-getid
-gmtime
-link
+fcntl/create
+fcntl/fcntl
 locale
-localtime
 math
-mem
-mktime
-mkostemps
-pipe
-printf
-rename
-rmdir
-scanf
-setid
 setjmp
-sleep
-sprintf
 stdio/all
 stdio/freopen
 stdio/fwrite
+stdio/getc_unget
+stdio/printf
+stdio/rename
+stdio/scanf
+stdio/sprintf
 stdlib/a64l
-stdlib/bsearch
-stdlib/mktemp
+stdlib/atof
+stdlib/atoi
+stdlib/env
+stdlib/mkostemps
 stdlib/rand
 stdlib/strtol
 stdlib/strtoul
+stdlib/system
+string/mem
 string/strchr
 string/strcspn
 string/strncmp
@@ -58,15 +38,35 @@ string/strspn
 string/strstr
 string/strtok
 string/strtok_r
-strftime
 strings
-system
-time
+time/asctime
+time/gmtime
+time/localtime
+time/mktime
+time/strftime
+time/time
+unistd/brk
+unistd/dup
+unistd/exec
+unistd/fchdir
+unistd/fsync
+unistd/ftruncate
 unistd/getopt
-unlink
+unistd/pipe
+unistd/rmdir
+unistd/sleep
+unistd/write
 waitpid
 wchar/mbrtowc
 wchar/mbsrtowcs
 wchar/putwchar
 wchar/wcrtomb
-write
+stdlib/alloc
+stdlib/bsearch
+stdlib/mktemp
+unistd/chdir
+unistd/gethostname
+unistd/getid
+unistd/link
+unistd/setid
+unistd/unlink

tests/Makefile

 # Binaries that should generate the same output every time
 EXPECT_BINS=\
+	args \
 	arpainet \
 	assert \
-	atof \
-	atoi \
-	brk \
-	args \
-	create \
 	ctype \
-	dup \
-	env \
 	error \
-	exec \
-	fchdir \
-	fcntl \
-	fsync \
-	ftruncate \
-	getc_unget \
+	fcntl/create \
+	fcntl/fcntl \
 	locale \
-	localtime \
 	math \
-	mem \
-	mktime \
-	mkostemps \
-	pipe \
-	printf \
-	rename \
-	rmdir \
-	scanf \
 	setjmp \
-	sleep \
-	sprintf \
-	strftime \
-	strings \
-	stdio/fwrite \
 	stdio/all \
 	stdio/freopen \
-	stdlib/strtol \
-	stdlib/strtoul \
+	stdio/fwrite \
+	stdio/getc_unget \
+	stdio/printf \
+	stdio/rename \
+	stdio/scanf \
+	stdio/sprintf \
 	stdlib/a64l \
+	stdlib/atof \
+	stdlib/atoi \
+	stdlib/env \
+	stdlib/mkostemps \
 	stdlib/rand \
-	string/strncmp \
-	string/strcspn \
+	stdlib/strtol \
+	stdlib/strtoul \
+	stdlib/system \
+	string/mem \
 	string/strchr \
+	string/strcspn \
+	string/strncmp \
+	string/strpbrk \
 	string/strrchr \
 	string/strspn \
 	string/strstr \
-	string/strpbrk \
 	string/strtok \
 	string/strtok_r \
-	system \
+	strings \
+	time/asctime \
+	time/gmtime \
+	time/localtime \
+	time/mktime \
+	time/strftime \
+	time/time \
+	unistd/brk \
+	unistd/dup \
+	unistd/exec \
+	unistd/fchdir \
+	unistd/fsync \
+	unistd/ftruncate \
 	unistd/getopt \
+	unistd/pipe \
+	unistd/rmdir \
+	unistd/sleep \
+	unistd/write \
 	waitpid \
 	wchar/mbrtowc \
 	wchar/mbsrtowcs \
 	wchar/putwchar \
-	wchar/wcrtomb \
-	write \
-	time \
-	gmtime \
-	asctime
+	wchar/wcrtomb
 
 # Binaries that may generate varied output
 BINS=\
 	$(EXPECT_BINS) \
-	alloc \
-	chdir \
-	gethostname \
-	getid \
-	link \
-	setid \
+	stdlib/alloc \
 	stdlib/bsearch \
 	stdlib/mktemp \
-	unlink
+	unistd/chdir \
+	unistd/gethostname \
+	unistd/getid \
+	unistd/link \
+	unistd/setid \
+	unistd/unlink
 
 all: $(BINS)
 

tests/expected/exec.stdout

-Hello World!