--- /dev/null
+#define CCAN_PR_LOG_DISABLE 1
+#include <ccan/pr_log/pr_log.h>
+#include <ccan/tap/tap.h>
+#include <stdlib.h>
+
+int main(void)
+{
+ plan_tests(7);
+ ok1(!debug_is(4));
+ ok1(!debug_is(0));
+ ok1(!debug_is(1));
+ ok1(!debug_is(2));
+ ok1(!debug_is(3));
+
+ pr_emerg("Emerg\n");
+ pr_alert("Alert\n");
+ pr_crit("Crit\n");
+ pr_error("Error\n");
+ pr_warn("Warn\n");
+ pr_notice("Notice\n");
+ pr_info("Info\n");
+ pr_debug("Debug\n");
+
+ pr_devel("Devel\n");
+
+ setenv("DEBUG", "1", 1);
+ ok1(!debug_is(1));
+
+ /* malformed check */
+ pr_log_(":4> 1\n");
+ pr_log_("<!> 2\n");
+ pr_log_("<1} 3\n");
+
+ ok1(debug_level() == -1);
+
+ return exit_status();
+}