//

// Unit test header for C/C++ programs.

//

// Copyright © 2021-2022 by Michael R Sweet.

//

// 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.

//

#ifndef TEST_H

#  define TEST_H

#  include <stdio.h>

#  include <stdlib.h>

#  include <stdarg.h>

#  include <stdbool.h>

#  include <string.h>

#  if _WIN32

#    define isatty(f) _isatty(f)

#  else

#    include <unistd.h>

#  endif // !_WIN32

#  ifdef __cplusplus

extern "C" {

#  endif // __cplusplus

//

// This header implements a simple unit test framework for C/C++ programs.

// Inline functions are provided to write a test summary to stdout and the

// details to stderr.  This allows unit test programs to output a summary to

// stdout with details sent to stderr, e.g.:

//

//     mytestprogram 2>test.log

//

// Documentation:

//

// void testBegin(const char *title, ...)

//

//     Start a test with a printf-style title message.  "Title:" (the formatted

//     title followed by a colon) is output.

//

// void testEnd(bool pass)

//

//     End a test without an additional message.  "pass" should be `true` if the

//     test passed and `false` otherwise.  "PASS" or "FAIL" is output.

//

// void testEndMessage(bool pass, const char *message, ...)

//

//     End a test with an additional printf-style message.  "pass" should be

//     `true` if the test passed and `false` otherwise.  "PASS (message)" or

//     "FAIL (message)" is output.

//

// testError(const char *error, ...)

//

//     Sends a formatted error string to stderr.

//

// testHexDump(const unsigned char *buffer, size_t bytes)

//

//     Sends a hex dump of the specified buffer to stderr.

//

// testMessage(const char *error, ...)

//

//     Outputs a formatted message string.

//

// testProgress(void)

//

//     Shows a progress spinner for long-running tests.

//

// bool testsPassed

//

//     This global variable specifies whether all tests have passed (`true`)

//     or one or more have failed (`false`).

//

static bool testsPassed = true;   // All tests passed?

static int test_progress;   // Current progress

static char test_title[1024] = "";  // Current test title

// Start a test

static inline void

testBegin(const char *title, ...) // I - printf-style title string

{

  va_list ap;     // Pointer to additional arguments

  // Format the title string

  va_start(ap, title);

  vsnprintf(test_title, sizeof(test_title), title, ap);

  va_end(ap);

  // Send the title to stdout and stderr...

  test_progress = 0;

  printf("%s: ", test_title);

  fflush(stdout);

  if (!isatty(2))

    fprintf(stderr, "%s: ", test_title);

}

// End a test with no additional information

static inline void

testEnd(bool pass)      // I - `true` if the test passed, `false` otherwise

{

  // Send the test result to stdout and stderr

  if (test_progress)

    putchar('\b');

  if (!pass)

    testsPassed = false;

  puts(pass ? "PASS" : "FAIL");

  if (!isatty(2))

    fputs(pass ? "PASS\n" : "FAIL\n", stderr);

  test_title[0] = '\0';

}

// End a test with no additional information

static inline void

testEndMessage(bool       pass,   // I - `true` if the test passed, `false` otherwise

               const char *message, ...)// I - printf-style message

{

  char    buffer[1024];   // Formatted title string

  va_list ap;     // Pointer to additional arguments

  // Format the title string

  va_start(ap, message);

  vsnprintf(buffer, sizeof(buffer), message, ap);

  va_end(ap);

  // Send the test result to stdout and stderr

  if (test_progress)

    putchar('\b');

  printf(pass ? "PASS (%s)\n" : "FAIL (%s)\n", buffer);

  if (!isatty(2))

    fprintf(stderr, pass ? "PASS (%s)\n" : "FAIL (%s)\n", buffer);

  test_title[0] = '\0';

}

// Show/update a progress spinner

static inline void

testProgress(void)

{

  if (test_progress)

    putchar('\b');

  putchar("-\\|/"[test_progress & 3]);

  fflush(stdout);

  test_progress ++;

}

// Show an error to stderr...

static inline void

testError(const char *error, ...) // I - printf-style error string

{

  char    buffer[1024];   // Formatted title string

  va_list ap;     // Pointer to additional arguments

  // Format the error string

  va_start(ap, error);

  vsnprintf(buffer, sizeof(buffer), error, ap);

  va_end(ap);

  // Send the error to stderr...

  fprintf(stderr, "%s\n", buffer);

  if (test_title[0])

    fprintf(stderr, "%s: ", test_title);

}

// Show a message to stdout and stderr...

static inline void

testMessage(const char *error, ...) // I - printf-style error string

{

  char    buffer[1024];   // Formatted title string

  va_list ap;     // Pointer to additional arguments

  // Format the error string

  va_start(ap, error);

  vsnprintf(buffer, sizeof(buffer), error, ap);

  va_end(ap);

  // Send the message to stdout and stderr too if needed...

  printf("%s\n", buffer);

  if (test_title[0])

  {

    printf("%s: ", test_title);

    fflush(stdout);

  }

  if (!isatty(2))

  {

    fprintf(stderr, "%s\n", buffer);

    if (test_title[0])

      fprintf(stderr, "%s: ", test_title);

  }

}

// Show a hex dump of a buffer to stderr...

static inline void

testHexDump(const unsigned char *buffer,// I - Buffer

            size_t              bytes)  // I - Number of bytes

{

  size_t  i, j;     // Looping vars

  int   ch;     // Current ASCII char

  if (test_title[0])

    fputs("\n", stderr);

  // Show lines of 16 bytes at a time...

  for (i = 0; i < bytes; i += 16)

  {

    // Show the offset...

    fprintf(stderr, "%04x ", (unsigned)i);

    // Then up to 16 bytes in hex...

    for (j = 0; j < 16; j ++)

    {

      if ((i + j) < bytes)

        fprintf(stderr, " %02x", buffer[i + j]);

      else

        fputs("   ", stderr);

    }

    // Then the ASCII representation of the bytes...

    fputs("  ", stderr);

    for (j = 0; j < 16 && (i + j) < bytes; j ++)

    {

      ch = buffer[i + j] & 127;

      if (ch < ' ' || ch == 127)

        fputc('.', stderr);

      else

        fputc(ch, stderr);

    }

    fputc('\n', stderr);

  }

  if (test_title[0])

    fprintf(stderr, "%s: ", test_title);

}

#  ifdef __cplusplus

}

#  endif // __cplusplus

#endif // !TEST_H