用glib來做單元測試。

setup, 創建受測對象，

teardown,釋放受測對象

#include <glib.h>
#include "dict.h"

typedef struct {
    dictionary *dd;
} dfixture;

void dict_setup(dfixture *df, gconstpointer test_data){
    df->dd = dictionary_new();
    dictionary_add(df->dd, "key1", "val1");
    dictionary_add(df->dd, "key2", NULL);
}

void dict_teardown(dfixture *df, gconstpointer test_data){
    dictionary_free(df->dd);
}

void check_keys(dictionary const *d){
    char *got_it = dictionary_find(d, "xx");
    g_assert(got_it == dictionary_not_found);
    got_it = dictionary_find(d, "key1");
    g_assert_cmpstr(got_it, ==, "val1");
    got_it = dictionary_find(d, "key2");
    g_assert_cmpstr(got_it, ==, NULL);
}

void test_new(dfixture *df, gconstpointer ignored){
    check_keys(df->dd);
}

void test_copy(dfixture *df, gconstpointer ignored){
    dictionary *cp = dictionary_copy(df->dd);
    check_keys(cp);
    dictionary_free(cp);
}

void test_failure(){
    if (g_test_trap_fork(0, G_TEST_TRAP_SILENCE_STDOUT | G_TEST_TRAP_SILENCE_STDERR)){
        dictionary *dd = dictionary_new();
        dictionary_add(dd, NULL, "blank");
    }
    g_test_trap_assert_failed();
    g_test_trap_assert_stderr("NULL is not a valid key.\n");
}

int main(int argc, char **argv){
    g_test_init(&argc, &argv, NULL);
    g_test_add ("/set1/new test", dfixture, NULL,
                                  dict_setup, test_new, dict_teardown);
    g_test_add ("/set1/copy test", dfixture, NULL,
                                  dict_setup, test_copy, dict_teardown);
    g_test_add_func ("/set2/fail test", test_failure);
    return g_test_run();
}

makefile 的寫法:

CFLAGS=-g -Wall -O3 pkg-config --cflags glib-2.0
LDADD=pkg-config --libs glib-2.0

dict_test: dict.o keyval.o

編譯後的訊息:

dict_test.c:47:5: warning: ‘g_test_trap_fork’ is deprecated (declared at /usr/include/glib-2.0/glib/gtestutils.h:198): Use 'g_test_trap_subprocess' instead [-Wdeprecated-declarations]
if (g_test_trap_fork(0, G_TEST_TRAP_SILENCE_STDOUT | G_TEST_TRAP_SILENCE_STDERR)){
^

作者2010年寫的書，g_test_trap_fork 已經過期了，建議使用g_test_trap_subprocess。

而筆者寫裝的套件，glib2.0 (2.38.1-0ubuntu1) ，dev套件一起安裝。

試著改用g_test_trap_subprocess。網路上的中文資源相對較少，而整個測試框架的文件，範例不是很多。

使用這個單元測試庫有比較好嗎?