diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 772ba1c..8ffe4e3 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -19,3 +19,22 @@ add_test(
   COMMAND
     ${CMAKE_CURRENT_BINARY_DIR}/scitokens-gtest
   )
+
+
+#
+# Simple, interactive test of the asynchronous interface.  Requires
+# network access to do anything meaningful.
+#
+add_executable(        scitokens-asynch-test asynch.cc )
+target_link_libraries( scitokens-asynch-test SciTokens )
+
+# This can't be the right to do specify this, and it also doesn't
+# handle aysnch.py being updated correctly.
+file(COPY asynch.py DESTINATION ${CMAKE_BINARY_DIR}/test)
+
+add_test(
+  NAME
+    asynch
+  COMMAND
+    ${CMAKE_CURRENT_BINARY_DIR}/asynch.py
+)
diff --git a/test/asynch.cc b/test/asynch.cc
new file mode 100644
index 0000000..0c57e70
--- /dev/null
+++ b/test/asynch.cc
@@ -0,0 +1,125 @@
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/select.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include "../src/scitokens.h"
+
+void
+void usage(const char *self) {
+    fprintf(stderr, "usage: %s encoded-scitoken\n", self);
+
+void
+void print_claim(SciToken &token, const char *claim) {
+    char *value;
+    char *error;
+    int rv = scitoken_get_claim_string(token, claim, &value, &error);
+    if (rv != 0) {
+        fprintf(stderr, "scitoken_get_claim_string('%s') failed: %s\n", claim,
+                error);
+        return;
+    }
+    fprintf( stdout, "%s = %s\n", claim, value );
+    fprintf(stdout, "%s = %s\n", claim, value);
+
+
+int main(int argc, char **argv) {
+    if (argc < 2) {
+        usage(argv[0]);
+        exit(-1);
+    }
+    const char *encoded = argv[1];
+    int rv;
+    char * error;
+    char *error;
+
+
+    char cache_path[FILENAME_MAX];
+    if( getcwd(cache_path, sizeof(cache_path)) == NULL ) {
+    if (getcwd(cache_path, sizeof(cache_path)) == NULL) {
+        fprintf(stderr, "Failed to determine cwd, aborting.\n");
+        exit(-5);
+
+    const char * key = "keycache.cache_home";
+    const char *key = "keycache.cache_home";
+    rv = scitoken_config_set_str(key, cache_path, &error);
+    if (rv != 0) {
+        fprintf(stderr, "Failed to set %s: %s, aborting.\n", key, cache_path);
+        exit(-5);
+
+
+    SciTokenStatus status;
+    rv = scitoken_deserialize_start(
+    rv = scitoken_deserialize_start(encoded, &token, NULL, &status, &error);
+    if (rv != 0) {
+        fprintf(stderr, "scitoken_deserialize_start() failed: %s\n", error);
+        exit(-2);
+    if( status == NULL ) {
+    if (status == NULL) {
+        fprintf(stderr, "scitoken_deserialize_start() returned a token\n");
+        exit(1);
+
+
+        fd_set * read_fds = NULL;
+        fd_set *read_fds = NULL;
+        rv = scitoken_status_get_read_fd_set(&status, &read_fds, &error);
+        if (rv != 0) {
+            fprintf(stderr, "scitoken_status_get_read_fd_set() failed: %s\n",
+                    error);
+            exit(-2);
+
+        fd_set * write_fds = NULL;
+        fd_set *write_fds = NULL;
+        rv = scitoken_status_get_write_fd_set(&status, &write_fds, &error);
+        if (rv != 0) {
+            fprintf(stderr, "scitoken_status_get_write_fd_set() failed: %s\n",
+                    error);
+            exit(-2);
+
+        fd_set * except_fds = NULL;
+        fd_set *except_fds = NULL;
+        rv = scitoken_status_get_exc_fd_set(&status, &except_fds, &error);
+        if (rv != 0) {
+            fprintf(stderr, "scitoken_status_get_exc_fd_set() failed: %s\n",
+                    error);
+            exit(-2);
+
+        int max_fds;
+        rv = scitoken_status_get_max_fd( & status, & max_fds, & error );
+        rv = scitoken_status_get_max_fd(&status, &max_fds, &error);
+        if (rv != 0) {
+            fprintf(stderr, "scitoken_status_get_max_fds() failed: %s\n",
+                    error);
+            exit(-2);
+
+        struct timeval time_out{1, 0};
+        struct timeval time_out {
+            1, 0
+        };
+        int s = select(max_fds + 1, read_fds, write_fds, except_fds, &time_out);
+        if (s == -1) {
+            fprintf(stderr, "select() failed: %s (%d)\n", strerror(errno),
+                    errno);
+            exit(-4);
+        } else if (s == 0) {
+            fprintf(stderr, "select() timed out, checking for progress.\n");
+
+        fprintf( stderr, "Calling scitoken_deserialize_continue()...\n" );
+        fprintf(stderr, "Calling scitoken_deserialize_continue()...\n");
+        rv = scitoken_deserialize_continue(&token, &status, &error);
+        if (rv != 0) {
+            fprintf(stderr, "scitoken_deserialize_continue() failed: %s\n",
+                    error);
+            exit(-3);
+    } while( status != NULL );
+    } while (status != NULL);
+    print_claim(token, "ver");
+    print_claim(token, "aud");
+    print_claim(token, "iss");
+    print_claim(token, "jti");
+
+    scitoken_destroy( token );
+    scitoken_destroy(token);
+}
diff --git a/test/asynch.py b/test/asynch.py
new file mode 100755
index 0000000..f71f1a0
--- /dev/null
+++ b/test/asynch.py
@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+
+import os
+import json
+import requests
+import subprocess
+import sys
+
+
+def get_demo_token(payload: dict):
+    data = json.dumps({'algorithm': "ES256", 'payload': payload})
+    resp = requests.post("https://demo.scitokens.org/issue", data=data)
+    return resp.text
+
+
+demo_payload = {
+    "ver": "scitoken:2.0",
+    "aud": "https://demo.scitokens.org",
+    "iss": "https://demo.scitokens.org",
+}
+demo_token = get_demo_token(demo_payload)
+
+try:
+    scitokens_cache = f"{os.getcwd()}/scitokens/scitokens_cpp.sqllite"
+    os.unlink(scitokens_cache)
+except FileNotFoundError:
+    pass
+
+rv = subprocess.run(
+    ['./scitokens-asynch-test', demo_token],
+    stdout=subprocess.PIPE,
+    stderr=subprocess.STDOUT,
+    timeout=5,
+    universal_newlines=True,
+)
+
+print(rv.stdout)
+sys.exit(rv.returncode)