--- /dev/null
+#include <ccan/tal/str/str.h>
+#include <ccan/tal/str/str.c>
+#include <ccan/tap/tap.h>
+
+int main(void)
+{
+ char *parent, *c;
+
+ plan_tests(14);
+
+ parent = tal(NULL, char);
+ ok1(parent);
+
+ c = tal_strdup(parent, "hello");
+
+ c = tal_strdup(parent, take(c));
+ ok1(strcmp(c, "hello") == 0);
+ ok1(tal_parent(c) == parent);
+
+ c = tal_strndup(parent, take(c), 5);
+ ok1(strcmp(c, "hello") == 0);
+ ok1(tal_parent(c) == parent);
+
+ c = tal_strndup(parent, take(c), 3);
+ ok1(strcmp(c, "hel") == 0);
+ ok1(tal_parent(c) == parent);
+ tal_free(c);
+
+ c = tal_strdup(parent, "hello %s");
+ c = tal_asprintf(parent, take(c), "there");
+ ok1(strcmp(c, "hello there") == 0);
+ ok1(tal_parent(c) == parent);
+ /* No leftover allocations. */
+ tal_free(c);
+ ok1(tal_first(parent) == NULL);
+
+ tal_free(parent);
+ ok1(!taken_any());
+
+ /* NULL pass-through. */
+ c = NULL;
+ ok1(tal_strdup(NULL, take(c)) == NULL);
+ ok1(tal_strndup(NULL, take(c), 5) == NULL);
+ ok1(tal_asprintf(NULL, take(c), 0) == NULL);
+
+ return exit_status();
+}