[liba] Add test to setjmp longjmp

Change-Id: I6951d7948d8c6a282b16007d6bef448c179f70b8

liba/Makefile

@@ -137,6 +137,7 @@ endif
 tests += $(addprefix liba/test/, \
   aeabi.c \
   ieee754.c \
+  setjmp.c \
   stddef.c \
   stdint.c \
   strlcpy.c \

liba/test/setjmp.c

@@ -0,0 +1,14 @@
+#include <quiz.h>
+#include <setjmp.h>
+#include <assert.h>
+
+QUIZ_CASE(set_jmp_long_jmp) {
+  jmp_buf env;
+  int res = setjmp(env);
+  if (res == 1) {
+    return;
+  }
+  int newres = (0 == res) ? res : res + 1;
+  longjmp(env, newres);
+  assert(false);
+}