test: add testcase for issue systemd#12883

(cherry picked from commit 3d5d346)
(cherry picked from commit 572385e)

src/test/test-conf-parser.c

@@ -230,6 +230,13 @@ static const char* const config_file[] = {
         "setting1=2\n"
         "setting1=1\n",      /* repeated settings */
 
+        "[Section]\n"
+        "[Section]\n"
+        "setting1=1\n"
+        "setting1=2\\\n"
+        "   \n"              /* empty line breaks continuation */
+        "setting1=1\n",      /* repeated settings */
+
         "[Section]\n"
         "setting1=1\\\n"     /* normal continuation */
         "2\\\n"
@@ -330,32 +337,32 @@ static void test_config_parse(unsigned i, const char *s) {
                          CONFIG_PARSE_WARN, NULL);
 
         switch (i) {
-        case 0 ... 3:
+        case 0 ... 4:
                 assert_se(r == 0);
                 assert_se(streq(setting1, "1"));
                 break;
 
-        case 4 ... 9:
+        case 5 ... 10:
                 assert_se(r == 0);
                 assert_se(streq(setting1, "1 2 3"));
                 break;
 
-        case 10:
+        case 11:
                 assert_se(r == 0);
                 assert_se(streq(setting1, "1\\\\ \\\\2"));
                 break;
 
-        case 11:
+        case 12:
                 assert_se(r == 0);
                 assert_se(streq(setting1, x1000("ABCD")));
                 break;
 
-        case 12 ... 13:
+        case 13 ... 14:
                 assert_se(r == 0);
                 assert_se(streq(setting1, x1000("ABCD") " foobar"));
                 break;
 
-        case 14 ... 15:
+        case 15 ... 16:
                 assert_se(r == -ENOBUFS);
                 assert_se(setting1 == NULL);
                 break;