buffer.c

#include "buffer.h"

/* statically allocate tests */
#define TEST_MAX (2 << 8)

struct test {
  struct test *next;
  char   *desc;
  int    pass;
} tests[TEST_MAX];

struct test *test = tests;

void describe(char *it) {
  test->it      = it;
  test->should  = NULL;
  test->failure = NULL;
}

void it_should(char *should) {
  if (test->should) {
    if (test->failure) {
      printf(".");
    } else {
      printf("F");
    }
  }

  test->should  = should;
  test->failure = NULL;
}

void it_failed_because(char *error_condition) {
  struct test *next = &test[1];

  test->failure = error_condition;

  next->it     = test->it;
  next->should = test->should;

  test = next;
}

void init_tests(void) {
  int i;

  for (i = 0; i < TEST_MAX; i = i + 1) {
    tests[i]->it      = NULL;
    tests[i]->should  = NULL;
    tests[i]->failure = NULL;
  }
}

void print_failures(void) {
  struct test *test = tests;

  while (test->failure) {
    printf("%s should %s, but %s.\n", test->it, test->should, test->failure);
  }
}

int main(int argc, char **argv) {
  init_tests();

  describe("dsp_b_new"); do {

    struct dsp_bc *cursor = dsp_b_new();

    it_should("return a cursor"); do {
      if (!cursor) { it_failed_because("no cursor was returned"); break; }
    }

    it_should("create a single, empty page"); do {
      if (!cursor) { it_failed_because("pre-conditions are not met");                break; }

      if (!cursor->page)      { it_failed_because("no page was created");            break; }
      if (cursor->page->next) { it_failed_because("more than one page was created"); break; }
      if (cursor->page->size) { it_failed_because("the created page is not empty");  break; }
    }

    it_should("set the cursor at the end of the page"); do {
      if (!cursor || !cursor->page) { it_failed_because("pre-conditions are not met"); break; }

      if (cursor->page_offset != page->size) {
        it_failed_because("the cursor is not at the end of the page");                 break;
      }
    }
  }

  printf("\n");

  print_failures();

  return (NULL != tests[0]->failure);
}