Move the rest of the tests into the tests subdirectory.

tests/test_null.c

@@ -0,0 +1,35 @@
+/*
+* Tests if binary strings are supported.
+*/
+
+#include <stdio.h>
+#include <string.h>
+#include "config.h"
+
+#include "json_inttypes.h"
+#include "json_object.h"
+
+int main() {
+    // this test has a space after the null character. check that it's still included
+    const char *input = " \0 ";
+    const char *expected = "\" \\u0000 \"";
+    struct json_object *string = json_object_new_string_len(input, 3);
+    const char *json = json_object_to_json_string(string);
+
+    int strings_match =  !strcmp( expected, json);
+    int retval = 0;
+    if (strings_match) {
+        printf("JSON write result is correct: %s\n", json);
+        printf("PASS\n");
+    } else {
+        printf("JSON write result doesn't match expected string\n");
+        printf("expected string: ");
+        printf("%s\n", expected);
+        printf("parsed string:   ");
+        printf("%s\n", json);
+        printf("FAIL\n");
+        retval=1;
+    }
+    json_object_put(string);
+    return retval;
+}