Tests: Add tuktest.h mini-test-framework.

2 files changed, 753 insertions, 0 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index f576ac12..e049add4 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -8,6 +8,7 @@
 EXTRA_DIST = \
 	files \
 	ossfuzz \
+	tuktest.h \
 	tests.h \
 	test_files.sh \
 	test_compress.sh \
diff --git a/tests/tuktest.h b/tests/tuktest.h
new file mode 100644
index 00000000..962e2514
--- /dev/null
+++ b/tests/tuktest.h
@@ -0,0 +1,752 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       tuktest.h
+/// \brief      Helper macros for writing simple test programs
+/// \version    2022-06-02
+///
+/// Some inspiration was taken from STest by Keith Nicholas.
+///
+/// This is standard C99/C11 only and thus should be fairly portable
+/// outside POSIX systems too.
+///
+/// This supports putting multiple tests in a single test program
+/// although it is perfectly fine to have only one test per program.
+/// Each test can produce one of these results:
+///   - Pass
+///   - Fail
+///   - Skip
+///   - Hard error (the remaining tests, if any, are not run)
+///
+/// By default this produces an exit status that is compatible with
+/// Automake and Meson, and mostly compatible with CMake.[1]
+/// If a test program contains multiple tests, only one exit code can
+/// be returned. Of the following, the first match is used:
+///   - 99 if any test returned a hard error
+///   - stdlib.h's EXIT_FAILURE if at least one test failed
+///   - 77 if at least one test was skipped or no tests were run at all
+///   - stdlib.h's EXIT_SUCCESS (0 on POSIX); that is, if none of the above
+///     are true then there was at least one test to run and none of them
+///     failed, was skipped, or returned a hard error.
+///
+/// A summary of tests being run and their results are printed to stdout.
+/// If you want ANSI coloring for the output, #define TUKTEST_COLOR.
+/// If you only want output when something goes wrong, #define TUKTEST_QUIET.
+///
+/// The downside of the above mapping is that it cannot indicate if
+/// some tests were skipped and some passed. If that is likely to
+/// happen it may be better to split into multiple test programs (one
+/// test per program) or use the TAP mode described below.
+///
+/// By using #define TUKTEST_TAP before #including this file the
+/// output will be Test Anything Protocol (TAP) version 12 compatible
+/// and the exit status will always be EXIT_SUCCESS. This can be easily
+/// used with Automake via its tap-driver.sh. Meson supports TAP natively.
+/// TAP's todo-directive isn't supported for now, mostly because it's not
+/// trivially convertible to the exit-status reporting method.
+///
+/// If TUKTEST_TAP is used, TUKTEST_QUIET and TUKTEST_COLOR are ignored.
+///
+/// The main() function may look like this (remember to include config.h
+/// or such files too if needed!):
+///
+///     #include "tuktest.h"
+///
+///     int main(int argc, char **argv)
+///     {
+///         tuktest_start(argc, argv);
+///
+///         if (!is_package_foo_available())
+///             tuktest_early_skip("Optional package foo is not available");
+///
+///         if (!do_common_initializations())
+///             tuktest_error("Error during common initializations");
+///
+///         tuktest_run(testfunc1);
+///         tuktest_run(testfunc2);
+///
+///         return tuktest_end();
+///     }
+///
+/// Using exit(tuktest_end()) as a pair to tuktest_start() is OK too.
+///
+/// Each test function called via tuktest_run() should be of type
+/// "void testfunc1(void)". The test functions should use the
+/// various assert_CONDITION() macros. The current test stops if
+/// an assertion fails (this is implemented with setjmp/longjmp).
+/// Execution continues from the next test unless the failure was
+/// due to assert_error() (indicating a hard error) which makes
+/// the program exit() without running any remaining tests.
+///
+/// Search for "define assert" in this file to find the explanations
+/// of the available assertion macros.
+///
+/// IMPORTANT:
+///
+///   - The assert_CONDITION() macros may only be used by code that is
+///     called via tuktest_run()! This includes not only the function
+///     named in the tuktest_run() call but also any functions called
+///     further from there. (The assert_CONDITION() macros depend on setup
+///     code in tuktest_run() and other use results in undefined behavior.)
+///
+///   - The limitations goes the other way too: Functions and macros
+///     other than the assert_CONDITION() macros must not be used in
+///     the tests called via tuktest_run().
+///
+/// Footnotes:
+///
+/// [1] As of 2022-06-02:
+///     See the Automake manual "info (automake)Scripts-based Testsuites" or:
+///     https://www.gnu.org/software/automake/manual/automake.html#Scripts_002dbased-Testsuites
+///
+///     Meson: https://mesonbuild.com/Unit-tests.html
+///
+///     CMake handles passing and failing tests by default but treats hard
+///     errors as regular fails. To CMake support skipped tests correctly,
+///     one has to set the SKIP_RETURN_CODE property for each test:
+///
+///     set_tests_properties(foo_test_name PROPERTIES SKIP_RETURN_CODE 77)
+///
+///     See:
+///     https://cmake.org/cmake/help/latest/command/set_tests_properties.html
+///     https://cmake.org/cmake/help/latest/prop_test/SKIP_RETURN_CODE.html
+//
+//  Author:    Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef TUKTEST_H
+#define TUKTEST_H
+
+#include <stddef.h>
+
+// On some (too) old systems inttypes.h doesn't exist or isn't good enough.
+// Include it conditionally so that any portability tricks can be done before
+// tuktest.h is included. On any modern system inttypes.h is fine as is.
+#ifndef PRIu64
+#	include <inttypes.h>
+#endif
+
+#include <setjmp.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+
+#if defined(__GNUC__) && defined(__GNUC_MINOR__)
+#	define TUKTEST_GNUC_REQ(major, minor) \
+		((__GNUC__ == (major) && __GNUC_MINOR__ >= (minor)) \
+			|| __GNUC__ > (major))
+#else
+#	define TUKTEST_GNUC_REQ(major, minor) 0
+#endif
+
+
+// We need printf("") so silence the warning about empty format string.
+#if TUKTEST_GNUC_REQ(4, 2)
+#	pragma GCC diagnostic ignored "-Wformat-zero-length"
+#endif
+
+
+// Types and printf format macros to use in integer assertions and also for
+// printing size_t values (C99's %zu isn't available on very old systems).
+typedef int64_t tuktest_int;
+typedef uint64_t tuktest_uint;
+#define TUKTEST_PRId PRId64
+#define TUKTEST_PRIu PRIu64
+#define TUKTEST_PRIX PRIX64
+
+
+// When TAP mode isn't used, Automake-compatible exit statuses are used.
+#define TUKTEST_EXIT_PASS EXIT_SUCCESS
+#define TUKTEST_EXIT_FAIL EXIT_FAILURE
+#define TUKTEST_EXIT_SKIP 77
+#define TUKTEST_EXIT_ERROR 99
+
+
+enum tuktest_result {
+	TUKTEST_PASS,
+	TUKTEST_FAIL,
+	TUKTEST_SKIP,
+	TUKTEST_ERROR,
+};
+
+
+#ifdef TUKTEST_TAP
+#	undef TUKTEST_QUIET
+#	undef TUKTEST_COLOR
+#	undef TUKTEST_TAP
+#	define TUKTEST_TAP 1
+#	define TUKTEST_STR_PASS  "ok -"
+#	define TUKTEST_STR_FAIL  "not ok -"
+#	define TUKTEST_STR_SKIP  "ok - # SKIP"
+#	define TUKTEST_STR_ERROR "Bail out!"
+#else
+#	define TUKTEST_TAP 0
+#	ifdef TUKTEST_COLOR
+#		define TUKTEST_COLOR_PASS  "\x1B[0;32m"
+#		define TUKTEST_COLOR_FAIL  "\x1B[0;31m"
+#		define TUKTEST_COLOR_SKIP  "\x1B[1;34m"
+#		define TUKTEST_COLOR_ERROR "\x1B[0;35m"
+#		define TUKTEST_COLOR_TOTAL "\x1B[1m"
+#		define TUKTEST_COLOR_OFF   "\x1B[m"
+#		define TUKTEST_COLOR_IF(cond, color) ((cond) ? (color) : "" )
+#	else
+#		define TUKTEST_COLOR_PASS  ""
+#		define TUKTEST_COLOR_FAIL  ""
+#		define TUKTEST_COLOR_SKIP  ""
+#		define TUKTEST_COLOR_ERROR ""
+#		define TUKTEST_COLOR_TOTAL ""
+#		define TUKTEST_COLOR_OFF   ""
+#		define TUKTEST_COLOR_IF(cond, color) ""
+#	endif
+#	define TUKTEST_COLOR_ADD(str, color) color str TUKTEST_COLOR_OFF
+#	define TUKTEST_STR_PASS \
+		TUKTEST_COLOR_ADD("PASS:", TUKTEST_COLOR_PASS)
+#	define TUKTEST_STR_FAIL \
+		TUKTEST_COLOR_ADD("FAIL:", TUKTEST_COLOR_FAIL)
+#	define TUKTEST_STR_SKIP \
+		TUKTEST_COLOR_ADD("SKIP:", TUKTEST_COLOR_SKIP)
+#	define TUKTEST_STR_ERROR \
+		TUKTEST_COLOR_ADD("ERROR:", TUKTEST_COLOR_ERROR)
+#endif
+
+// NOTE: If TUKTEST_TAP is defined then TUKTEST_QUIET will get undefined above.
+#ifndef TUKTEST_QUIET
+#	define TUKTEST_QUIET 0
+#else
+#	undef TUKTEST_QUIET
+#	define TUKTEST_QUIET 1
+#endif
+
+
+// Counts of the passed, failed, skipped, and hard-errored tests.
+// This is indexed with the enumeration constants from enum tuktest_result.
+static unsigned tuktest_stats[4] = { 0, 0, 0, 0 };
+
+// Copy of argc and argv from main(). These are set by tuktest_start().
+static int tuktest_argc = 0;
+static char **tuktest_argv = NULL;
+
+// Name of the currently-running test. This exists because it's nice
+// to print the main test function name even if the failing test-assertion
+// fails in a function called by the main test function.
+static const char *tuktest_name = NULL;
+
+// longjmp() target for when a test-assertion fails.
+static jmp_buf tuktest_jmpenv;
+
+
+// printf() is without checking its return value in many places. This function
+// is called before exiting to check the status of stdout and catch errors.
+static void
+tuktest_catch_stdout_errors(void)
+{
+	if (ferror(stdout) || fclose(stdout)) {
+		fputs("Error while writing to stdout\n", stderr);
+		exit(TUKTEST_EXIT_ERROR);
+	}
+}
+
+
+// A simplified basename()-like function that is good enough for
+// cleaning up __FILE__. This supports / and \ as path separator.
+// If the path separator is wrong then the full path will be printed;
+// it's a cosmetic problem only.
+static const char *
+tuktest_basename(const char *filename)
+{
+	for (const char *p = filename + strlen(filename); p > filename; --p)
+		if (*p == '/' || *p == '\\')
+			return p + 1;
+
+	return filename;
+}
+
+
+/// Initialize the test framework. No other functions or macros
+/// from this file may be called before calling this.
+///
+/// If the arguments from main() aren't available, use 0 and NULL.
+/// If these are set, then only a subset of tests can be run by
+/// specifying their names on the command line.
+#define tuktest_start(argc, argv) \
+do { \
+	tuktest_argc = argc; \
+	tuktest_argv = argv; \
+	if (!TUKTEST_TAP && !TUKTEST_QUIET) \
+		printf("=== %s ===\n", tuktest_basename(__FILE__)); \
+} while (0)
+
+
+/// If it can be detected early that no tests can be run, this macro can
+/// be called after tuktest_start() but before any tuktest_run() to print
+/// a reason why the tests were skipped. Note that this macro calls exit().
+///
+/// Using "return tuktest_end();" in main() when no tests were run has
+/// the same result as tuktest_early_skip() except that then no reason
+/// for the skipping can be printed.
+#define tuktest_early_skip(...) \
+do { \
+	printf("%s [%s:%u] ", \
+			TUKTEST_TAP ? "1..0 # SKIP" : TUKTEST_STR_SKIP, \
+			tuktest_basename(__FILE__), __LINE__); \
+	printf(__VA_ARGS__); \
+	printf("\n"); \
+	if (!TUKTEST_TAP && !TUKTEST_QUIET) \
+		printf("=== END ===\n"); \
+	tuktest_catch_stdout_errors(); \
+	exit(TUKTEST_TAP ? EXIT_SUCCESS : TUKTEST_EXIT_SKIP); \
+} while (0)
+
+
+/// Some test programs need to do initializations before or between
+/// calls to tuktest_run(). If such initializations unexpectedly fail,
+/// tuktest_error() can be used to report it as a hard error outside
+/// test functions, for example, in main(). Then the remaining tests
+/// won't be run (this macro calls exit()).
+///
+/// Typically tuktest_error() would be used before any tuktest_run()
+/// calls but it is also possible to use tuktest_error() after one or
+/// more tests have been run with tuktest_run(). This is in contrast to
+/// tuktest_early_skip() which must never be called after tuktest_run().
+///
+/// NOTE: tuktest_start() must have been called before tuktest_error().
+///
+/// NOTE: This macro MUST NOT be called from test functions running under
+/// tuktest_run()! Use assert_error() to report a hard error in code that
+/// is running under tuktest_run().
+#define tuktest_error(...) \
+do { \
+	++tuktest_stats[TUKTEST_ERROR]; \
+	printf(TUKTEST_STR_ERROR " [%s:%u] ", \
+			tuktest_basename(__FILE__), __LINE__); \
+	printf(__VA_ARGS__); \
+	printf("\n"); \
+	exit(tuktest_end()); \
+} while (0)
+
+
+/// At the end of main() one should have "return tuktest_end();" which
+/// prints the stats or the TAP plan, and handles the exit status.
+/// Using exit(tuktest_end()) is OK too.
+///
+/// If the test program can detect early that all tests must be skipped,
+/// then tuktest_early_skip() may be useful so that the reason why the
+/// tests were skipped can be printed.
+static int
+tuktest_end(void)
+{
+	unsigned total_tests = 0;
+	for (unsigned i = 0; i <= TUKTEST_ERROR; ++i)
+		total_tests += tuktest_stats[i];
+
+	if (tuktest_stats[TUKTEST_ERROR] == 0 && tuktest_argc > 1
+			&& (unsigned)(tuktest_argc - 1) > total_tests) {
+		printf(TUKTEST_STR_ERROR " Fewer tests were run than "
+				"specified on the command line. "
+				"Was a test name mistyped?\n");
+		++tuktest_stats[TUKTEST_ERROR];
+	}
+
+#if TUKTEST_TAP
+	// Print the plan only if no "Bail out!" has occurred.
+	// Print the skip directive if no tests were run.
+	// We cannot know the reason for the skip here though
+	// (see tuktest_early_skip()).
+	if (tuktest_stats[TUKTEST_ERROR] == 0)
+		printf("1..%u%s\n", total_tests,
+				total_tests == 0 ? " # SKIP" : "");
+
+	tuktest_catch_stdout_errors();
+	return EXIT_SUCCESS;
+#else
+	if (!TUKTEST_QUIET)
+		printf("---\n"
+				"%s# TOTAL: %u" TUKTEST_COLOR_OFF "\n"
+				"%s# PASS:  %u" TUKTEST_COLOR_OFF "\n"
+				"%s# SKIP:  %u" TUKTEST_COLOR_OFF "\n"
+				"%s# FAIL:  %u" TUKTEST_COLOR_OFF "\n"
+				"%s# ERROR: %u" TUKTEST_COLOR_OFF "\n"
+				"=== END ===\n",
+				TUKTEST_COLOR_TOTAL,
+				total_tests,
+				TUKTEST_COLOR_IF(
+					tuktest_stats[TUKTEST_PASS] > 0,
+					TUKTEST_COLOR_PASS),
+				tuktest_stats[TUKTEST_PASS],
+				TUKTEST_COLOR_IF(
+					tuktest_stats[TUKTEST_SKIP] > 0,
+					TUKTEST_COLOR_SKIP),
+				tuktest_stats[TUKTEST_SKIP],
+				TUKTEST_COLOR_IF(
+					tuktest_stats[TUKTEST_FAIL] > 0,
+					TUKTEST_COLOR_FAIL),
+				tuktest_stats[TUKTEST_FAIL],
+				TUKTEST_COLOR_IF(
+					tuktest_stats[TUKTEST_ERROR] > 0,
+					TUKTEST_COLOR_ERROR),
+				tuktest_stats[TUKTEST_ERROR]);
+
+	tuktest_catch_stdout_errors();
+
+	if (tuktest_stats[TUKTEST_ERROR] > 0)
+		return TUKTEST_EXIT_ERROR;
+
+	if (tuktest_stats[TUKTEST_FAIL] > 0)
+		return TUKTEST_EXIT_FAIL;
+
+	if (tuktest_stats[TUKTEST_SKIP] > 0 || total_tests == 0)
+		return TUKTEST_EXIT_SKIP;
+
+	return TUKTEST_EXIT_PASS;
+#endif
+}
+
+
+/// Runs the specified test function. Requires that tuktest_start()
+/// has already been called and that tuktest_end() has NOT been called yet.
+#define tuktest_run(testfunc) \
+	tuktest_run_test(&(testfunc), #testfunc)
+
+static void
+tuktest_run_test(void (*testfunc)(void), const char *testfunc_str)
+{
+	// If any command line arguments were given, only the test functions
+	// named on the command line will be run.
+	if (tuktest_argc > 1) {
+		int i = 1;
+		while (strcmp(tuktest_argv[i], testfunc_str) != 0)
+			if (++i == tuktest_argc)
+				return;
+	}
+
+	// This is set so that failed assertions can print the correct
+	// test name even when the assertion is in a helper function
+	// called by the test function.
+	tuktest_name = testfunc_str;
+
+	// The way setjmp() may be called is very restrictive.
+	// A switch statement is one of the few conforming ways
+	// to get the value passed to longjmp(); doing something
+	// like "int x = setjmp(env)" is NOT allowed (undefined behavior).
+	switch (setjmp(tuktest_jmpenv)) {
+		case 0:
+			testfunc();
+			++tuktest_stats[TUKTEST_PASS];
+			if (!TUKTEST_QUIET)
+				printf(TUKTEST_STR_PASS " %s\n", tuktest_name);
+			break;
+
+		case TUKTEST_FAIL:
+			++tuktest_stats[TUKTEST_FAIL];
+			break;
+
+		case TUKTEST_SKIP:
+			++tuktest_stats[TUKTEST_SKIP];
+			break;
+
+		default:
+			++tuktest_stats[TUKTEST_ERROR];
+			exit(tuktest_end());
+	}
+
+	tuktest_name = NULL;
+}
+
+
+// Internal helper that converts an enum tuktest_result value to a string.
+static const char *
+tuktest_result_str(enum tuktest_result result)
+{
+	return result == TUKTEST_PASS ? TUKTEST_STR_PASS
+			: (result) == TUKTEST_FAIL ? TUKTEST_STR_FAIL
+			: (result) == TUKTEST_SKIP ? TUKTEST_STR_SKIP
+			: TUKTEST_STR_ERROR;
+}
+
+
+// Internal helper for assert_fail, assert_skip, and assert_error.
+#define tuktest_print_and_jump(result, ...) \
+do { \
+	printf("%s %s [%s:%u] ", tuktest_result_str(result), tuktest_name, \
+			tuktest_basename(__FILE__), __LINE__); \
+	printf(__VA_ARGS__); \
+	printf("\n"); \
+	longjmp(tuktest_jmpenv, result); \
+} while (0)
+
+
+/// Unconditionally fails the test (non-zero exit status if not using TAP).
+/// Execution will continue from the next test.
+///
+/// A printf format string is supported.
+/// If no extra message is wanted, use "" as the argument.
+#define assert_fail(...) tuktest_print_and_jump(TUKTEST_FAIL, __VA_ARGS__)
+
+
+/// Skips the test (exit status 77 if not using TAP).
+/// Execution will continue from the next test.
+///
+/// If you can detect early that no tests can be run, tuktest_early_skip()
+/// might be a better way to skip the test(s). Especially in TAP mode this
+/// makes a difference as with assert_skip() it will list a skipped specific
+/// test name but with tuktest_early_skip() it will indicate that the whole
+/// test program was skipped (with tuktest_early_skip() the TAP plan will
+/// indicate zero tests).
+///
+/// A printf format string is supported.
+/// If no extra message is wanted, use "" as the argument.
+#define assert_skip(...) tuktest_print_and_jump(TUKTEST_SKIP, __VA_ARGS__)
+
+
+/// Hard error (exit status 99 if not using TAP).
+/// The remaining tests in this program will not be run or reported.
+///
+/// A printf format string is supported.
+/// If no extra message is wanted, use "" as the argument.
+#define assert_error(...) tuktest_print_and_jump(TUKTEST_ERROR, __VA_ARGS__)
+
+
+/// Fails the test if the test expression doesn't evaluate to false.
+#define assert_false(test_expr) \
+do { \
+	if (test_expr) \
+		assert_fail("assert_fail: '%s' is true but should be false", \
+				#test_expr); \
+} while (0)
+
+
+/// Fails the test if the test expression doesn't evaluate to true.
+#define assert_true(test_expr) \
+do { \
+	if (!(test_expr)) \
+		assert_fail("assert_true: '%s' is false but should be true", \
+				#test_expr); \
+} while (0)
+
+
+/// Fails the test if comparing the signed integer expressions using the
+/// specified comparison operator evaluates to false. For example,
+/// assert_int(foobar(), >=, 0) fails the test if 'foobar() >= 0' isn't true.
+/// For good error messages, the first argument should be the test expression
+/// and the third argument the reference value (usually a constant).
+///
+/// For equality (==) comparison there is a assert_int_eq() which
+/// might be more convenient to use.
+#define assert_int(test_expr, cmp_op, ref_value) \
+do { \
+	const tuktest_int v_test_ = (test_expr); \
+	const tuktest_int v_ref_ = (ref_value); \
+	if (!(v_test_ cmp_op v_ref_)) \
+		assert_fail("assert_int: '%s == %" TUKTEST_PRId \
+				"' but expected '... %s %" TUKTEST_PRId "'", \
+				#test_expr, v_test_, #cmp_op, v_ref_); \
+} while (0)
+
+
+/// Like assert_int() but for unsigned integers.
+///
+/// For equality (==) comparison there is a assert_uint_eq() which
+/// might be more convenient to use.
+#define assert_uint(test_expr, cmp_op, ref_value) \
+do { \
+	const tuktest_uint v_test_ = (test_expr); \
+	const tuktest_uint v_ref_ = (ref_value); \
+	if (!(v_test_ cmp_op v_ref_)) \
+		assert_fail("assert_uint: '%s == %" TUKTEST_PRIu \
+				"' but expected '... %s %" TUKTEST_PRIu "'", \
+				#test_expr, v_test_, #cmp_op, v_ref_); \
+} while (0)
+
+
+/// Fails the test if test expression doesn't equal the expected
+/// signed integer value.
+#define assert_int_eq(test_expr, ref_value) \
+	assert_int(test_expr, ==, ref_value)
+
+
+/// Fails the test if test expression doesn't equal the expected
+/// unsigned integer value.
+#define assert_uint_eq(test_expr, ref_value) \
+	assert_uint(test_expr, ==, ref_value)
+
+
+/// Fails the test if the test expression doesn't equal the expected
+/// enumeration value. This is like assert_int_eq() but the error message
+/// shows the enumeration constant names instead of their numeric values
+/// as long as the values are non-negative and not big.
+///
+/// The third argument must be a table of string pointers. A pointer to
+/// a pointer doesn't work because this determines the number of elements
+/// in the array using sizeof. For example:
+///
+///     const char *my_enum_names[] = { "MY_FOO", "MY_BAR", "MY_BAZ" };
+///     assert_enum_eq(some_func_returning_my_enum(), MY_BAR, my_enum_names);
+///
+/// (If the reference value is out of bounds, both values are printed as
+/// an integer. If only test expression is out of bounds, it is printed
+/// as an integer and the reference as a string. Otherwise both are printed
+/// as a string.)
+#define assert_enum_eq(test_expr, ref_value, enum_strings) \
+do { \
+	const tuktest_int v_test_ = (test_expr); \
+	const tuktest_int v_ref_ = (ref_value); \
+	if (v_test_ != v_ref_) { \
+		const int array_len_ = (int)(sizeof(enum_strings) \
+				/ sizeof((enum_strings)[0])); \
+		if (v_ref_ < 0 || v_ref_ >= array_len_) \
+			assert_fail("assert_enum_eq: '%s == %" TUKTEST_PRId \
+					"' but expected " \
+					"'... == %" TUKTEST_PRId "'", \
+					#test_expr, v_test_, v_ref_); \
+		else if (v_test_ < 0 || v_test_ >= array_len_) \
+			assert_fail("assert_enum_eq: '%s == %" TUKTEST_PRId \
+					"' but expected '... == %s'", \
+					#test_expr, v_test_, \
+					(enum_strings)[v_ref_]); \
+		else \
+			assert_fail("assert_enum_eq: '%s == %s' " \
+					"but expected '... = %s'", \
+					#test_expr, (enum_strings)[v_test_], \
+					(enum_strings)[v_ref_]); \
+	} \
+} while (0)
+
+
+/// Fails the test if the specified bit isn't set in the test expression.
+#define assert_bit_set(test_expr, bit) \
+do { \
+	const tuktest_uint v_test_ = (test_expr); \
+	const unsigned v_bit_ = (bit); \
+	const tuktest_uint v_mask_ = (tuktest_uint)1 << v_bit_; \
+	if (!(v_test_ & v_mask_)) \
+		assert_fail("assert_bit_set: '%s == 0x%" TUKTEST_PRIX \
+				"' but bit %u (0x%" TUKTEST_PRIX ") " \
+				"is not set", \
+				#test_expr, v_test_, v_bit_, v_mask_); \
+} while (0)
+
+
+/// Fails the test if the specified bit is set in the test expression.
+#define assert_bit_not_set(test_expr, bit) \
+do { \
+	const tuktest_uint v_test_ = (test_expr); \
+	const unsigned v_bit_ = (bit); \
+	const tuktest_uint v_mask_ = (tuktest_uint)1 << v_bit_; \
+	if (v_test_ & v_mask_) \
+		assert_fail("assert_bit_not_set: '%s == 0x%" TUKTEST_PRIX \
+				"' but bit %u (0x%" TUKTEST_PRIX ") is set", \
+				#test_expr, v_test_, v_bit_, v_mask_); \
+} while (0)
+
+
+/// Fails the test if unless all bits that are set in the bitmask are also
+/// set in the test expression.
+#define assert_bitmask_set(test_expr, mask) \
+do { \
+	const tuktest_uint v_mask_ = (mask); \
+	const tuktest_uint v_test_ = (test_expr) & v_mask_; \
+	if (v_test_ != v_mask_) \
+		assert_fail("assert_bitmask_set: " \
+				"'((%s) & 0x%" TUKTEST_PRIX ") == " \
+				"0x%" TUKTEST_PRIX "' but expected " \
+				"'... == 0x%" TUKTEST_PRIX "'", \
+				#test_expr, v_mask_, v_test_, v_mask_); \
+} while (0)
+
+
+/// Fails the test if any of the bits that are set in the bitmask are also
+/// set in the test expression.
+#define assert_bitmask_not_set(test_expr, mask) \
+do { \
+	const tuktest_uint v_mask_ = (mask); \
+	const tuktest_uint v_test_ = (test_expr) & v_mask_; \
+	if (v_test_ != 0) \
+		assert_fail("assert_bitmask_not_set: "\
+				"'((%s) & 0x%" TUKTEST_PRIX ") == " \
+				"0x%" TUKTEST_PRIX "' but expected " \
+				"'... == 0'", \
+				#test_expr, v_mask_, v_test_); \
+} while (0)
+
+
+// Internal helper to add common code for string assertions.
+#define tuktest_str_helper1(macro_name, test_expr, ref_value) \
+	const char *v_test_ = (test_expr); \
+	const char *v_ref_ = (ref_value); \
+	if (v_test_ == NULL) \
+		assert_fail(macro_name ": Test expression '%s' is NULL", \
+				#test_expr); \
+	if (v_ref_ == NULL) \
+		assert_fail(macro_name ": Reference value '%s' is NULL", \
+				#ref_value)
+
+
+// Internal helper to add common code for string assertions and to check
+// that the reference value isn't an empty string.
+#define tuktest_str_helper2(macro_name, test_expr, ref_value) \
+	tuktest_str_helper1(macro_name, test_expr, ref_value); \
+	if (v_ref_[0] == '\0') \
+		assert_fail(macro_name ": Reference value is an empty string")
+
+
+/// Fails the test if the test expression evaluates to string that doesn't
+/// equal to the expected string.
+#define assert_str_eq(test_expr, ref_value) \
+do { \
+	tuktest_str_helper1("assert_str_eq", test_expr, ref_value); \
+	if (strcmp(v_ref_, v_test_) != 0) \
+		assert_fail("assert_str_eq: '%s' evaluated to '%s' " \
+				"but expected '%s'", \
+				#test_expr, v_test_, v_ref_); \
+} while (0)
+
+
+/// Fails the test if the test expression evaluates to a string that doesn't
+/// contain the reference value as a substring. Also fails the test if
+/// the reference value is an empty string.
+#define assert_str_contains(test_expr, ref_value) \
+do { \
+	tuktest_str_helper2("assert_str_contains", test_expr, ref_value); \
+	if (strstr(v_test_, v_ref_) == NULL) \
+		assert_fail("assert_str_contains: '%s' evaluated to '%s' " \
+				"which doesn't contain '%s'", \
+				#test_expr, v_test_, v_ref_); \
+} while (0)
+
+
+/// Fails the test if the test expression evaluates to a string that
+/// contains the reference value as a substring. Also fails the test if
+/// the reference value is an empty string.
+#define assert_str_doesnt_contain(test_expr, ref_value) \
+do { \
+	tuktest_str_helper2("assert_str_doesnt_contain", \
+			test_expr, ref_value); \
+	if (strstr(v_test_, v_ref_) != NULL) \
+		assert_fail("assert_str_doesnt_contain: " \
+				"'%s' evaluated to '%s' which contains '%s'", \
+				#test_expr, v_test_, v_ref_); \
+} while (0)
+
+
+/// Fails the test if the first array_size elements of the test array
+/// don't equal to correct_array.
+///
+/// NOTE: This avoids %zu for portability to very old systems that still
+/// can compile C99 code.
+#define assert_array_eq(test_array, correct_array, array_size) \
+do { \
+	for (size_t i_ = 0; i_ < (array_size); ++i_) \
+		if ((test_array)[i_] != (correct_array)[i_]) \
+			assert_fail("assert_array_eq: " \
+					"%s[%" TUKTEST_PRIu "] != "\
+					"%s[%" TUKTEST_PRIu "] " \
+					"but should be equal", \
+					#test_array, (tuktest_uint)i_, \
+					#correct_array, (tuktest_uint)i_); \
+} while (0)
+
+#endif