Switch test cases to use libcheck framework

This keeps the test logic the same, but moves most of them into the libcheck
test suite framework.  It gives better control over grouping related tests,
running them in parallel, and reporting on multiple failures.

Running in parallel also brings problems, so libykcs11 tests are left
untouched.  Parallel access to a single hardware DUT does not make sense,
and pcsc-lite doesn't work after a fork() in OS X 10.11+, so it can't run
in libcheck's tests anyway.

tool/tests/test_inout.c

@@ -28,6 +28,8 @@
  *
  */
 
+#include <check.h>
+
 #include <stdbool.h>
 #include <stdio.h>
 #include <string.h>
@@ -40,25 +42,58 @@
 #define pipe(fds) _pipe(fds,4096, 0)
 #endif
 
-static void test_inout(enum enum_format format) {
+enum enum_format formats[] = {
+  format_arg_base64,
+  format_arg_hex,
+  format_arg_binary,
+};
+
+static bool inout(enum enum_format format) {
   const unsigned char buf[] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08};
   unsigned char buf2[sizeof(buf)];
   int pipefd[2];
   FILE *tmp1, *tmp2;
 
-  assert(pipe(pipefd) == 0);
+  if (pipe(pipefd) != 0)
+    return false;
   tmp1 = fdopen(pipefd[1], "w");
   dump_data(buf, sizeof(buf), tmp1, false, format);
   fclose(tmp1);
   tmp2 = fdopen(pipefd[0], "r");
   read_data(buf2, sizeof(buf2), tmp2, format);
-  assert(memcmp(buf, buf2, sizeof(buf)) == 0);
+  if (memcmp(buf, buf2, sizeof(buf)) != 0)
+    return false;
   fclose(tmp2);
+  return true;
 }
 
-int main(void) {
-  test_inout(format_arg_base64);
-  test_inout(format_arg_hex);
-  test_inout(format_arg_binary);
-  exit(0);
+START_TEST(test_inout) {
+  ck_assert(inout(formats[_i]));
+}
+END_TEST
+
+Suite *test_suite(void) {
+  Suite *s;
+  TCase *tc;
+
+  s = suite_create("yubico-piv-tool inout");
+  tc = tcase_create("inout");
+  tcase_add_loop_test(tc, test_inout, 0, sizeof(formats) / sizeof(*formats));
+  suite_add_tcase(s, tc);
+
+  return s;
+}
+
+int main(void)
+{
+  int number_failed;
+  Suite *s;
+  SRunner *sr;
+
+  s = test_suite();
+  sr = srunner_create(s);
+  srunner_run_all(sr, CK_NORMAL);
+  number_failed = srunner_ntests_failed(sr);
+  srunner_free(sr);
+  return (number_failed == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
 }