json_out: new module for authoring JSON strings.

[ccan] / ccan / json_out / test / run-move_cb.c

diff --git a/ccan/json_out/test/run-move_cb.c b/ccan/json_out/test/run-move_cb.c
new file mode 100644 (file)
index 0000000..445b426
--- /dev/null
+++ b/ccan/json_out/test/run-move_cb.c
@@ -0,0 +1,48 @@
+#include <ccan/json_out/json_out.h>
+/* Include the C files directly. */
+#include <ccan/json_out/json_out.c>
+#include <ccan/tap/tap.h>
+
+static const char *ptr;
+static bool called = false;
+
+static void move_cb(struct json_out *jout, ptrdiff_t delta,
+                   struct json_out *arg)
+{
+       ptr += delta;
+       called = true;
+       ok1(arg == jout);
+}
+
+int main(void)
+{
+       const tal_t *ctx = tal(NULL, char);
+       struct json_out *jout;
+       char *p;
+       size_t len;
+
+       /* This is how many tests you plan to run */
+       plan_tests(3);
+
+       /* Test nested arrays. */
+       jout = json_out_new(ctx);
+       json_out_call_on_move(jout, move_cb, jout);
+
+       json_out_start(jout, NULL, '{');
+       ptr = json_out_contents(jout, &len);
+
+       p = json_out_member_direct(jout, "fieldname", 102);
+       p[0] = '"';
+       p[101] = '"';
+       memset(p+1, 'p', 100);
+
+       json_out_finished(jout);
+       ok1(called);
+       /* Contents should have moved correctly. */
+       ok1(json_out_contents(jout, &len) == ptr);
+
+       tal_free(ctx);
+
+       /* This exits depending on whether all tests passed */
+       return exit_status();
+}