Tests: Add TAP helpers in tests/utils/tap
authorChristian Babeux <christian.babeux@efficios.com>
Thu, 21 Feb 2013 21:31:16 +0000 (16:31 -0500)
committerChristian Babeux <christian.babeux@efficios.com>
Fri, 22 Feb 2013 18:00:22 +0000 (13:00 -0500)
tests/utils/tap/tap.{h,c}:
For use in C tests. You can link against libtap with the usual automake
mechanisms.

tests/utils/tap/tap.sh:
For use in shell scripts tests. Source the script
(e.g. source "tests/utils/tap/tap.sh") to use the relevants TAP functions.

Signed-off-by: Christian Babeux <christian.babeux@efficios.com>
configure.ac
tests/utils/Makefile.am [new file with mode: 0644]
tests/utils/tap/Makefile.am [new file with mode: 0644]
tests/utils/tap/tap.c [new file with mode: 0644]
tests/utils/tap/tap.h [new file with mode: 0644]
tests/utils/tap/tap.sh [new file with mode: 0755]

index 1809df7eba83c0af6cc6571a2592abbb57c9964d..7e35c06458fc081340b448c85d75b9c18bc94bae 100644 (file)
@@ -324,6 +324,8 @@ AC_CONFIG_FILES([
        tests/regression/ust/overlap/Makefile
        tests/regression/ust/overlap/demo/Makefile
        tests/unit/Makefile
        tests/regression/ust/overlap/Makefile
        tests/regression/ust/overlap/demo/Makefile
        tests/unit/Makefile
+       tests/utils/Makefile
+       tests/utils/tap/Makefile
 ])
 
 AC_OUTPUT
 ])
 
 AC_OUTPUT
diff --git a/tests/utils/Makefile.am b/tests/utils/Makefile.am
new file mode 100644 (file)
index 0000000..feae65a
--- /dev/null
@@ -0,0 +1 @@
+SUBDIRS = tap
diff --git a/tests/utils/tap/Makefile.am b/tests/utils/tap/Makefile.am
new file mode 100644 (file)
index 0000000..01df68a
--- /dev/null
@@ -0,0 +1,2 @@
+lib_LTLIBRARIES = libtap.la
+libtap_la_SOURCES = tap.c
diff --git a/tests/utils/tap/tap.c b/tests/utils/tap/tap.c
new file mode 100644 (file)
index 0000000..a430951
--- /dev/null
@@ -0,0 +1,427 @@
+/*-
+ * Copyright (c) 2004 Nik Clayton
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#define _GNU_SOURCE
+#include <ctype.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "tap.h"
+
+static int no_plan = 0;
+static int skip_all = 0;
+static int have_plan = 0;
+static unsigned int test_count = 0; /* Number of tests that have been run */
+static unsigned int e_tests = 0; /* Expected number of tests to run */
+static unsigned int failures = 0; /* Number of tests that failed */
+static char *todo_msg = NULL;
+static char *todo_msg_fixed = "libtap malloc issue";
+static int todo = 0;
+static int test_died = 0;
+
+/* Encapsulate the pthread code in a conditional.  In the absence of
+   libpthread the code does nothing */
+#ifdef HAVE_LIBPTHREAD
+#include <pthread.h>
+static pthread_mutex_t M = PTHREAD_MUTEX_INITIALIZER;
+# define LOCK pthread_mutex_lock(&M);
+# define UNLOCK pthread_mutex_unlock(&M);
+#else
+# define LOCK
+# define UNLOCK
+#endif
+
+static void _expected_tests(unsigned int);
+static void _tap_init(void);
+static void _cleanup(void);
+
+/*
+ * Generate a test result.
+ *
+ * ok -- boolean, indicates whether or not the test passed.
+ * test_name -- the name of the test, may be NULL
+ * test_comment -- a comment to print afterwards, may be NULL
+ */
+unsigned int
+_gen_result(int ok, const char *func, char *file, unsigned int line,
+           char *test_name, ...)
+{
+       va_list ap;
+       char *local_test_name = NULL;
+       char *c;
+       int name_is_digits;
+
+       LOCK;
+
+       test_count++;
+
+       /* Start by taking the test name and performing any printf()
+          expansions on it */
+       if(test_name != NULL) {
+               va_start(ap, test_name);
+               vasprintf(&local_test_name, test_name, ap);
+               va_end(ap);
+
+               /* Make sure the test name contains more than digits
+                  and spaces.  Emit an error message and exit if it
+                  does */
+               if(local_test_name) {
+                       name_is_digits = 1;
+                       for(c = local_test_name; *c != '\0'; c++) {
+                               if(!isdigit(*c) && !isspace(*c)) {
+                                       name_is_digits = 0;
+                                       break;
+                               }
+                       }
+
+                       if(name_is_digits) {
+                               diag("    You named your test '%s'.  You shouldn't use numbers for your test names.", local_test_name);
+                               diag("    Very confusing.");
+                       }
+               }
+       }
+
+       if(!ok) {
+               printf("not ");
+               failures++;
+       }
+
+       printf("ok %d", test_count);
+
+       if(test_name != NULL) {
+               printf(" - ");
+
+               /* Print the test name, escaping any '#' characters it
+                  might contain */
+               if(local_test_name != NULL) {
+                       flockfile(stdout);
+                       for(c = local_test_name; *c != '\0'; c++) {
+                               if(*c == '#')
+                                       fputc('\\', stdout);
+                               fputc((int)*c, stdout);
+                       }
+                       funlockfile(stdout);
+               } else {        /* vasprintf() failed, use a fixed message */
+                       printf("%s", todo_msg_fixed);
+               }
+       }
+
+       /* If we're in a todo_start() block then flag the test as being
+          TODO.  todo_msg should contain the message to print at this
+          point.  If it's NULL then asprintf() failed, and we should
+          use the fixed message.
+
+          This is not counted as a failure, so decrement the counter if
+          the test failed. */
+       if(todo) {
+               printf(" # TODO %s", todo_msg ? todo_msg : todo_msg_fixed);
+               if(!ok)
+                       failures--;
+       }
+
+       printf("\n");
+
+       if(!ok) {
+               if(getenv("HARNESS_ACTIVE") != NULL)
+                       fputs("\n", stderr);
+
+               diag("    Failed %stest (%s:%s() at line %d)",
+                    todo ? "(TODO) " : "", file, func, line);
+       }
+       free(local_test_name);
+
+       UNLOCK;
+
+       /* We only care (when testing) that ok is positive, but here we
+          specifically only want to return 1 or 0 */
+       return ok ? 1 : 0;
+}
+
+/*
+ * Initialise the TAP library.  Will only do so once, however many times it's
+ * called.
+ */
+void
+_tap_init(void)
+{
+       static int run_once = 0;
+
+       if(!run_once) {
+               atexit(_cleanup);
+
+               /* stdout needs to be unbuffered so that the output appears
+                  in the same place relative to stderr output as it does
+                  with Test::Harness */
+               setbuf(stdout, 0);
+               run_once = 1;
+       }
+}
+
+/*
+ * Note that there's no plan.
+ */
+int
+plan_no_plan(void)
+{
+
+       LOCK;
+
+       _tap_init();
+
+       if(have_plan != 0) {
+               fprintf(stderr, "You tried to plan twice!\n");
+               test_died = 1;
+               UNLOCK;
+               exit(255);
+       }
+
+       have_plan = 1;
+       no_plan = 1;
+
+       UNLOCK;
+
+       return 1;
+}
+
+/*
+ * Note that the plan is to skip all tests
+ */
+int
+plan_skip_all(char *reason)
+{
+
+       LOCK;
+
+       _tap_init();
+
+       skip_all = 1;
+
+       printf("1..0");
+
+       if(reason != NULL)
+               printf(" # Skip %s", reason);
+
+       printf("\n");
+
+       UNLOCK;
+
+       exit(0);
+}
+
+/*
+ * Note the number of tests that will be run.
+ */
+int
+plan_tests(unsigned int tests)
+{
+
+       LOCK;
+
+       _tap_init();
+
+       if(have_plan != 0) {
+               fprintf(stderr, "You tried to plan twice!\n");
+               test_died = 1;
+               UNLOCK;
+               exit(255);
+       }
+
+       if(tests == 0) {
+               fprintf(stderr, "You said to run 0 tests!  You've got to run something.\n");
+               test_died = 1;
+               UNLOCK;
+               exit(255);
+       }
+
+       have_plan = 1;
+
+       _expected_tests(tests);
+
+       UNLOCK;
+
+       return e_tests;
+}
+
+unsigned int
+diag(char *fmt, ...)
+{
+       va_list ap;
+
+       fputs("# ", stderr);
+
+       va_start(ap, fmt);
+       vfprintf(stderr, fmt, ap);
+       va_end(ap);
+
+       fputs("\n", stderr);
+
+       return 0;
+}
+
+void
+_expected_tests(unsigned int tests)
+{
+
+       printf("1..%d\n", tests);
+       e_tests = tests;
+}
+
+int
+skip(unsigned int n, char *fmt, ...)
+{
+       va_list ap;
+       char *skip_msg;
+
+       LOCK;
+
+       va_start(ap, fmt);
+       asprintf(&skip_msg, fmt, ap);
+       va_end(ap);
+
+       while(n-- > 0) {
+               test_count++;
+               printf("ok %d # skip %s\n", test_count,
+                      skip_msg != NULL ?
+                      skip_msg : "libtap():malloc() failed");
+       }
+
+       free(skip_msg);
+
+       UNLOCK;
+
+       return 1;
+}
+
+void
+todo_start(char *fmt, ...)
+{
+       va_list ap;
+
+       LOCK;
+
+       va_start(ap, fmt);
+       vasprintf(&todo_msg, fmt, ap);
+       va_end(ap);
+
+       todo = 1;
+
+       UNLOCK;
+}
+
+void
+todo_end(void)
+{
+
+       LOCK;
+
+       todo = 0;
+       free(todo_msg);
+
+       UNLOCK;
+}
+
+int
+exit_status(void)
+{
+       int r;
+
+       LOCK;
+
+       /* If there's no plan, just return the number of failures */
+       if(no_plan || !have_plan) {
+               UNLOCK;
+               return failures;
+       }
+
+       /* Ran too many tests?  Return the number of tests that were run
+          that shouldn't have been */
+       if(e_tests < test_count) {
+               r = test_count - e_tests;
+               UNLOCK;
+               return r;
+       }
+
+       /* Return the number of tests that failed + the number of tests
+          that weren't run */
+       r = failures + e_tests - test_count;
+       UNLOCK;
+
+       return r;
+}
+
+/*
+ * Cleanup at the end of the run, produce any final output that might be
+ * required.
+ */
+void
+_cleanup(void)
+{
+
+       LOCK;
+
+       /* If plan_no_plan() wasn't called, and we don't have a plan,
+          and we're not skipping everything, then something happened
+          before we could produce any output */
+       if(!no_plan && !have_plan && !skip_all) {
+               diag("Looks like your test died before it could output anything.");
+               UNLOCK;
+               return;
+       }
+
+       if(test_died) {
+               diag("Looks like your test died just after %d.", test_count);
+               UNLOCK;
+               return;
+       }
+
+
+       /* No plan provided, but now we know how many tests were run, and can
+          print the header at the end */
+       if(!skip_all && (no_plan || !have_plan)) {
+               printf("1..%d\n", test_count);
+       }
+
+       if((have_plan && !no_plan) && e_tests < test_count) {
+               diag("Looks like you planned %d %s but ran %d extra.",
+                    e_tests, e_tests == 1 ? "test" : "tests", test_count - e_tests);
+               UNLOCK;
+               return;
+       }
+
+       if((have_plan || !no_plan) && e_tests > test_count) {
+               diag("Looks like you planned %d %s but only ran %d.",
+                    e_tests, e_tests == 1 ? "test" : "tests", test_count);
+               UNLOCK;
+               return;
+       }
+
+       if(failures)
+               diag("Looks like you failed %d %s of %d.",
+                    failures, failures == 1 ? "test" : "tests", test_count);
+
+       UNLOCK;
+}
diff --git a/tests/utils/tap/tap.h b/tests/utils/tap/tap.h
new file mode 100644 (file)
index 0000000..0f05943
--- /dev/null
@@ -0,0 +1,89 @@
+/*-
+ * Copyright (c) 2004 Nik Clayton
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/* '## __VA_ARGS__' is a gcc'ism. C99 doesn't allow the token pasting
+   and requires the caller to add the final comma if they've ommitted
+   the optional arguments */
+#ifdef __GNUC__
+# define ok(e, test, ...) ((e) ?                                       \
+                          _gen_result(1, __func__, __FILE__, __LINE__, \
+                                      test, ## __VA_ARGS__) :          \
+                          _gen_result(0, __func__, __FILE__, __LINE__, \
+                                      test, ## __VA_ARGS__))
+
+# define ok1(e) ((e) ?                                                 \
+                _gen_result(1, __func__, __FILE__, __LINE__, "%s", #e) : \
+                _gen_result(0, __func__, __FILE__, __LINE__, "%s", #e))
+
+# define pass(test, ...) ok(1, test, ## __VA_ARGS__);
+# define fail(test, ...) ok(0, test, ## __VA_ARGS__);
+
+# define skip_start(test, n, fmt, ...)                 \
+       do {                                            \
+               if((test)) {                            \
+                       skip(n, fmt, ## __VA_ARGS__);   \
+                       continue;                       \
+               }
+#elif __STDC_VERSION__ >= 199901L /* __GNUC__ */
+# define ok(e, ...) ((e) ?                                             \
+                    _gen_result(1, __func__, __FILE__, __LINE__,       \
+                                __VA_ARGS__) :                         \
+                    _gen_result(0, __func__, __FILE__, __LINE__,       \
+                                __VA_ARGS__))
+
+# define ok1(e) ((e) ?                                                 \
+                _gen_result(1, __func__, __FILE__, __LINE__, "%s", #e) : \
+                _gen_result(0, __func__, __FILE__, __LINE__, "%s", #e))
+
+# define pass(...) ok(1, __VA_ARGS__);
+# define fail(...) ok(0, __VA_ARGS__);
+
+# define skip_start(test, n, ...)                      \
+       do {                                            \
+               if((test)) {                            \
+                       skip(n,  __VA_ARGS__);          \
+                       continue;                       \
+               }
+#else /* __STDC_VERSION__ */
+# error "Needs gcc or C99 compiler for variadic macros."
+#endif /* __STDC_VERSION__ */
+
+#define skip_end() } while(0);
+
+unsigned int _gen_result(int, const char *, char *, unsigned int, char *, ...);
+
+int plan_no_plan(void);
+int plan_skip_all(char *);
+int plan_tests(unsigned int);
+
+unsigned int diag(char *, ...);
+
+int skip(unsigned int, char *, ...);
+
+void todo_start(char *, ...);
+void todo_end(void);
+
+int exit_status(void);
diff --git a/tests/utils/tap/tap.sh b/tests/utils/tap/tap.sh
new file mode 100755 (executable)
index 0000000..24ac1aa
--- /dev/null
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+#!/bin/bash
+#
+# Copyright 2010 Patrick LeBoutillier <patrick.leboutillier@gmail.com>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+_version='1.01'
+
+_plan_set=0
+_no_plan=0
+_skip_all=0
+_test_died=0
+_expected_tests=0
+_executed_tests=0
+_failed_tests=0
+TODO=
+
+
+usage(){
+    cat <<'USAGE'
+tap-functions: A TAP-producing BASH library
+
+PLAN:
+  plan_no_plan
+  plan_skip_all [REASON]
+  plan_tests NB_TESTS
+
+TEST:
+  ok RESULT [NAME]
+  okx COMMAND
+  is RESULT EXPECTED [NAME]
+  isnt RESULT EXPECTED [NAME]
+  like RESULT PATTERN [NAME]
+  unlike RESULT PATTERN [NAME]
+  pass [NAME]
+  fail [NAME]
+
+SKIP:
+  skip [CONDITION] [REASON] [NB_TESTS=1]
+
+  skip $feature_not_present "feature not present" 2 || {
+      is $a "a"
+      is $b "b"
+  }
+
+TODO:
+  Specify TODO mode by setting $TODO:
+    TODO="not implemented yet"
+    ok $result "some not implemented test"
+    unset TODO
+
+OTHER:
+  diag MSG
+
+EXAMPLE:
+  #!/bin/bash
+
+  . tap-functions
+
+  plan_tests 7
+
+  me=$USER
+  is $USER $me "I am myself"
+  like $HOME $me "My home is mine"
+  like "`id`" $me "My id matches myself"
+
+  /bin/ls $HOME 1>&2
+  ok $? "/bin/ls $HOME"
+  # Same thing using okx shortcut
+  okx /bin/ls $HOME
+
+  [[ "`id -u`" != "0" ]]
+  i_am_not_root=$?
+  skip $i_am_not_root "Must be root" || {
+    okx ls /root
+  }
+
+  TODO="figure out how to become root..."
+  okx [ "$HOME" == "/root" ]
+  unset TODO
+USAGE
+    exit
+}
+
+opt=
+set_u=
+while getopts ":sx" opt ; do
+    case $_opt in
+        u) set_u=1 ;;
+        *) usage ;;
+    esac
+done
+shift $(( OPTIND - 1 ))
+# Don't allow uninitialized variables if requested
+[[ -n "$set_u" ]] && set -u
+unset opt set_u
+
+# Used to call _cleanup on shell exit
+trap _exit EXIT
+
+
+plan_no_plan(){
+    (( _plan_set != 0 )) && "You tried to plan twice!"
+
+    _plan_set=1
+    _no_plan=1
+
+    return 0
+}
+
+
+plan_skip_all(){
+    local reason=${1:-''}
+
+    (( _plan_set != 0 )) && _die "You tried to plan twice!"
+
+    _print_plan 0 "Skip $reason"
+
+    _skip_all=1
+    _plan_set=1
+    _exit 0
+
+    return 0
+}
+
+plan_tests(){
+    local tests=${1:?}
+
+    (( _plan_set != 0 )) && _die "You tried to plan twice!"
+    (( tests == 0 )) && _die "You said to run 0 tests!  You've got to run something."
+
+    _print_plan $tests
+    _expected_tests=$tests
+    _plan_set=1
+
+    return $tests
+}
+
+
+_print_plan(){
+    local tests=${1:?}
+    local directive=${2:-''}
+
+    echo -n "1..$tests"
+    [[ -n "$directive" ]] && echo -n " # $directive"
+    echo
+}
+
+
+pass(){
+    local name=$1
+    ok 0 "$name"
+}
+
+
+fail(){
+    local name=$1
+    ok 1 "$name"
+}
+
+# This is the workhorse method that actually
+# prints the tests result.
+ok(){
+    local result=${1:?}
+    local name=${2:-''}
+
+    (( _plan_set == 0 )) && _die "You tried to run a test without a plan!  Gotta have a plan."
+
+    _executed_tests=$(( $_executed_tests + 1 ))
+
+    if [[ -n "$name" ]] ; then
+        if _matches "$name" "^[0-9]+$" ; then
+            diag "    You named your test '$name'.  You shouldn't use numbers for your test names."
+            diag "    Very confusing."
+        fi
+    fi
+
+    if (( result != 0 )) ; then
+        echo -n "not "
+        _failed_tests=$(( _failed_tests + 1 ))
+    fi
+    echo -n "ok $_executed_tests"
+
+    if [[ -n "$name" ]] ; then
+        local ename=${name//\#/\\#}
+        echo -n " - $ename"
+    fi
+
+    if [[ -n "$TODO" ]] ; then
+        echo -n " # TODO $TODO" ;
+        if (( result != 0 )) ; then
+            _failed_tests=$(( _failed_tests - 1 ))
+        fi
+    fi
+
+    echo
+    if (( result != 0 )) ; then
+        local file='tap-functions'
+        local func=
+        local line=
+
+        local i=0
+        local bt=$(caller $i)
+        while _matches "$bt" "tap-functions$" ; do
+            i=$(( $i + 1 ))
+            bt=$(caller $i)
+        done
+        local backtrace=
+        eval $(caller $i | (read line func file ; echo "backtrace=\"$file:$func() at line $line.\""))
+
+        local t=
+        [[ -n "$TODO" ]] && t="(TODO) "
+
+        if [[ -n "$name" ]] ; then
+            diag "  Failed ${t}test '$name'"
+            diag "  in $backtrace"
+        else
+            diag "  Failed ${t}test in $backtrace"
+        fi
+    fi
+
+    return $result
+}
+
+
+okx(){
+    local command="$@"
+
+    local line=
+    diag "Output of '$command':"
+    "$@" | while read line ; do
+        diag "$line"
+    done
+    ok ${PIPESTATUS[0]} "$command"
+}
+
+
+_equals(){
+    local result=${1:?}
+    local expected=${2:?}
+
+    if [[ "$result" == "$expected" ]] ; then
+        return 0
+    else
+        return 1
+    fi
+}
+
+
+# Thanks to Aaron Kangas for the patch to allow regexp matching
+# under bash < 3.
+ _bash_major_version=${BASH_VERSION%%.*}
+_matches(){
+    local result=${1:?}
+    local pattern=${2:?}
+
+    if [[ -z "$result" || -z "$pattern" ]] ; then
+        return 1
+    else
+        if (( _bash_major_version >= 3 )) ; then
+            [[ "$result" =~ "$pattern" ]]
+        else
+            echo "$result" | egrep -q "$pattern"
+        fi
+    fi
+}
+
+
+_is_diag(){
+    local result=${1:?}
+    local expected=${2:?}
+
+    diag "         got: '$result'"
+    diag "    expected: '$expected'"
+}
+
+
+is(){
+    local result=${1:?}
+    local expected=${2:?}
+    local name=${3:-''}
+
+    _equals "$result" "$expected"
+    (( $? == 0 ))
+    ok $? "$name"
+    local r=$?
+    (( r != 0 )) && _is_diag "$result" "$expected"
+    return $r
+}
+
+
+isnt(){
+    local result=${1:?}
+    local expected=${2:?}
+    local name=${3:-''}
+
+    _equals "$result" "$expected"
+    (( $? != 0 ))
+    ok $? "$name"
+    local r=$?
+    (( r != 0 )) && _is_diag "$result" "$expected"
+    return $r
+}
+
+
+like(){
+    local result=${1:?}
+    local pattern=${2:?}
+    local name=${3:-''}
+
+    _matches "$result" "$pattern"
+    (( $? == 0 ))
+    ok $? "$name"
+    local r=$?
+    (( r != 0 )) && diag "    '$result' doesn't match '$pattern'"
+    return $r
+}
+
+
+unlike(){
+    local result=${1:?}
+    local pattern=${2:?}
+    local name=${3:-''}
+
+    _matches "$result" "$pattern"
+    (( $? != 0 ))
+    ok $? "$name"
+    local r=$?
+    (( r != 0 )) && diag "    '$result' matches '$pattern'"
+    return $r
+}
+
+
+skip(){
+    local condition=${1:?}
+    local reason=${2:-''}
+    local n=${3:-1}
+
+    if (( condition == 0 )) ; then
+        local i=
+        for (( i=0 ; i<$n ; i++ )) ; do
+            _executed_tests=$(( _executed_tests + 1 ))
+            echo "ok $_executed_tests # skip: $reason"
+        done
+        return 0
+    else
+        return
+    fi
+}
+
+
+diag(){
+    local msg=${1:?}
+
+    if [[ -n "$msg" ]] ; then
+        echo "# $msg"
+    fi
+
+    return 1
+}
+
+
+_die(){
+    local reason=${1:-'<unspecified error>'}
+
+    echo "$reason" >&2
+    _test_died=1
+    _exit 255
+}
+
+
+BAIL_OUT(){
+    local reason=${1:-''}
+
+    echo "Bail out! $reason" >&2
+    _exit 255
+}
+
+
+_cleanup(){
+    local rc=0
+
+    if (( _plan_set == 0 )) ; then
+        diag "Looks like your test died before it could output anything."
+        return $rc
+    fi
+
+    if (( _test_died != 0 )) ; then
+        diag "Looks like your test died just after $_executed_tests."
+        return $rc
+    fi
+
+    if (( _skip_all == 0 && _no_plan != 0 )) ; then
+        _print_plan $_executed_tests
+    fi
+
+    local s=
+    if (( _no_plan == 0 && _expected_tests < _executed_tests )) ; then
+        s= ; (( _expected_tests > 1 )) && s=s
+        local extra=$(( _executed_tests - _expected_tests ))
+        diag "Looks like you planned $_expected_tests test$s but ran $extra extra."
+        rc=1 ;
+    fi
+
+    if (( _no_plan == 0 && _expected_tests > _executed_tests )) ; then
+        s= ; (( _expected_tests > 1 )) && s=s
+        diag "Looks like you planned $_expected_tests test$s but only ran $_executed_tests."
+    fi
+
+    if (( _failed_tests > 0 )) ; then
+        s= ; (( _failed_tests > 1 )) && s=s
+        diag "Looks like you failed $_failed_tests test$s of $_executed_tests."
+    fi
+
+    return $rc
+}
+
+
+_exit_status(){
+    if (( _no_plan != 0 || _plan_set == 0 )) ; then
+        return $_failed_tests
+    fi
+
+    if (( _expected_tests < _executed_tests )) ; then
+        return $(( _executed_tests - _expected_tests  ))
+    fi
+
+    return $(( _failed_tests + ( _expected_tests - _executed_tests )))
+}
+
+
+_exit(){
+    local rc=${1:-''}
+    if [[ -z "$rc" ]] ; then
+        _exit_status
+        rc=$?
+    fi
+
+    _cleanup
+    local alt_rc=$?
+    (( alt_rc != 0 )) && rc=$alt_rc
+    trap - EXIT
+    exit $rc
+}
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