Expand encoder test coverage

test/loadf_dumpf.c

@@ -17,7 +17,9 @@ int main(int argc, char *argv[])
         return 1;
     }
 
-    json_dumpf(json, stdout, 0);
+    /* loadf_dumpf indents, others don't, so dumping with and without
+       indenting is tested */
+    json_dumpf(json, stdout, JSON_INDENT(4));
     json_decref(json);
 
     return 0;

test/testdata/valid

@@ -16,6 +16,8 @@
 ========
 ["\uD834\uDD1E surrogate, four-byte UTF-8"]
 ========
+["\u0012 escaped control character"]
+========
 [0]
 ========
 [1]