add some support for INTEGER decoding
diff --git a/skeletons/tests/check-OER-INTEGER.c b/skeletons/tests/check-OER-INTEGER.c
index 1e91999..a202180 100644
--- a/skeletons/tests/check-OER-INTEGER.c
+++ b/skeletons/tests/check-OER-INTEGER.c
@@ -1,29 +1,66 @@
 #include <stdio.h>
 #include <assert.h>
 
+#include <asn_codecs.h>
 #include <INTEGER.h>
-#include <INTEGER.c>
-#include <INTEGER_oer.c>
 
-#define CHECK_DECODE_OK(a, b, c)    check_decode_ok(__LINE__, a, b, c)
+#define CHECK_DECODE(code, a, b, c, d, e, f)    check_decode(__LINE__, code, a, b, c, d, e, f)
 
-void
-check_decode_ok(int lineno, intmax_t control, char *buf, size_t size) {
+static const intmax_t NoBound = -4200024;
+
+static void
+check_decode(int lineno, enum asn_dec_rval_code_e code, intmax_t control, const char *buf, size_t size, const char *dummy, intmax_t lower_bound, intmax_t upper_bound) {
+    static char *code_s[] = { "RC_OK", "RC_WMORE", "RC_FAIL", "<error>" };
+
+    fprintf(stderr, "%d: buf[%d]={%d, %d, ...}\n", lineno, size,
+            ((const uint8_t *)buf)[0],
+            ((const uint8_t *)buf)[1]);
 
     INTEGER_t *st = NULL;
     asn_dec_rval_t ret;
+    struct asn_oer_constraints_s empty_constraints = {{0,0,0}, {0,0,0}};
+    struct asn_oer_constraints_s *constraints = &empty_constraints;
+    struct asn_oer_constraint_s *ct_value = &constraints->value;
 
-    ret = asn_DEF_INTEGER.oer_decoder(0, &asn_DEF_INTEGER, 0, (void **)&st, buf, size);
+    /* Setup integer constraints as requested */
+    if(lower_bound == NoBound && upper_bound == NoBound) {
+        constraints = NULL;
+    } else {
+        if(lower_bound != NoBound) {
+            ct_value->flags |= AOC_HAS_LOWER_BOUND;
+            ct_value->lower_bound = lower_bound;
+        }
+        if(upper_bound != NoBound) {
+            ct_value->flags |= AOC_HAS_UPPER_BOUND;
+            ct_value->upper_bound = upper_bound;
+        }
+    }
+
+    (void)dummy;
+
+    ret = asn_DEF_INTEGER.oer_decoder(0, &asn_DEF_INTEGER, constraints,
+                                      (void **)&st, buf, size);
     if(ret.code != RC_OK) {
         /* Basic OER decode does not work */
         fprintf(stderr, "%d: Failed oer_decode(ctl=%" PRIdMAX ", size=%zu)\n",
                 lineno, control, size);
-        assert(ret.code == RC_OK);
+        if(ret.code == code) {
+            fprintf(stderr, "  (That was expected)\n");
+            return;
+        } else {
+            fprintf(
+                stderr, "  Unexpected return code %s (%d) expected %s\n",
+                code_s[(unsigned)ret.code <= RC_FAIL ? RC_FAIL : (RC_FAIL + 1)],
+                (int)ret.code, code_s[code]);
+            assert(ret.code == code);
+        }
     } else {
         intmax_t outcome;
         if(asn_INTEGER2imax(st, &outcome) != 0) {
             /* Result of decode is structurally incorrect */
-            fprintf(stderr, "%d: Failed to convert INTEGER 2 imax\n",
+            fprintf(stderr,
+                    "%d: Failed to convert INTEGER 2 imax; structurally "
+                    "incorrect INTEGER\n",
                     lineno);
             assert(!"Unreachable");
         } else if(outcome != control) {
@@ -41,5 +78,28 @@
 
 int
 main() {
-	CHECK_DECODE_OK(0, "", 1);
+	CHECK_DECODE(RC_WMORE, 0, "", 0, "bounds=", NoBound, NoBound);
+	CHECK_DECODE(RC_FAIL, 0, "\x00", 1, "bounds=", NoBound, NoBound);
+	CHECK_DECODE(RC_WMORE, 0, "", 0, "bounds=", 0, 0);
+	CHECK_DECODE(RC_WMORE, 0, "", 0, "bounds=", 0, 1);
+	CHECK_DECODE(RC_OK, 0, "\x00", 1, "bounds=", 0, 1);
+	CHECK_DECODE(RC_OK, 0, "\x00", 1, "bounds=", -1, 1);
+
+	CHECK_DECODE(RC_OK, 0, "\x00", 1, "bounds=", -1, 1);
+	CHECK_DECODE(RC_OK, 1, "\x01", 1, "bounds=", -1, 1);
+	CHECK_DECODE(RC_OK, -1, "\xff", 1, "bounds=", -1, 1);
+	CHECK_DECODE(RC_OK, -1, "\xff", 1, "bounds=", -1, 1);
+	CHECK_DECODE(RC_OK, 127, "\x7f", 1, "bounds=", 0, 127);
+	CHECK_DECODE(RC_OK, 255, "\xff", 1, "bounds=", 0, 127);
+	CHECK_DECODE(RC_OK, 255, "\xff", 1, "bounds=", 0, 255);
+	CHECK_DECODE(RC_WMORE, 0, "\xff", 1, "bounds=", 0, 256);
+	CHECK_DECODE(RC_OK, 65535, "\xff\xff", 2, "bounds=", 0, 256);
+
+	CHECK_DECODE(RC_OK, 0, "\x01\x00", 2, "bounds=", NoBound, 1);
+	CHECK_DECODE(RC_OK, 1, "\x01\x01", 2, "bounds=", NoBound, 1);
+	CHECK_DECODE(RC_OK, -1, "\x1\xff", 2, "bounds=", NoBound, 1);
+	CHECK_DECODE(RC_OK, -1, "\x1\xff", 2, "bounds=", NoBound, 1);
+	CHECK_DECODE(RC_OK, -1, "\x1\xff", 2, "bounds=", NoBound, 255);
+	CHECK_DECODE(RC_WMORE, -1, "\x02\x00\xff", 2, "bounds=", NoBound, 200);
+	CHECK_DECODE(RC_OK, 255, "\x02\x00\xff", 3, "bounds=", NoBound, 200);
 }