test_store: unlink test files during teardown

…rather than doing it at creation.

Fixes: #249

Author: N-R-K

tests/test_store.c

@@ -46,7 +46,6 @@
 #define TEST_CONTENT_DIR "/dev/shm/clip_store_content_dir_test"
 
 static int create_test_snip_fd(void) {
-    shm_unlink(TEST_SNIP_FILE);
     int snip_fd = shm_open(TEST_SNIP_FILE, O_RDWR | O_CREAT | O_EXCL, 0600);
     assert(snip_fd >= 0);
     return snip_fd;
@@ -104,7 +103,6 @@ static void remove_test_content_dir(const char *path) {
 }
 
 static int create_test_content_dir_fd(void) {
-    remove_test_content_dir(TEST_CONTENT_DIR);
     int ret = mkdir(TEST_CONTENT_DIR, 0700);
     assert(ret == 0);
     int dir_fd = open(TEST_CONTENT_DIR, O_RDONLY);
@@ -146,7 +144,9 @@ static void drop_teardown_test(struct clip_store *cs) {
     int ret = cs_destroy(cs);
     assert(ret == 0);
     close(snip_fd);
+    shm_unlink(TEST_SNIP_FILE);
     close(content_dir_fd);
+    remove_test_content_dir(TEST_CONTENT_DIR);
 }
 
 static void add_ten_snips(struct clip_store *cs) {