refactoring; finishing integration of CMocka; several test cases covered

test/session/query_extract_from_buf.c

@@ -0,0 +1,49 @@
+#include <cmocka.h>
+#include <setjmp.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <main.h>
+#include <session.h>
+#include <string.h>
+
+#define TEST_BUF "First line\nThe second line\r\nThe third line\nFourth line\0"
+#define SUBSTR_NUM 4
+
+void test_query_extract_from_buf_filled(void **state) {
+  session sess = {.buf = TEST_BUF, .buf_used = sizeof TEST_BUF};
+  char *lines[SUBSTR_NUM];
+  for (int i = 0; i < SUBSTR_NUM; i++) {
+    query_extract_from_buf(&sess, &lines[i]);
+  }
+  assert_memory_equal("First line\n", lines[0], strlen(lines[0]));
+  assert_memory_equal("The second line\n", lines[1], strlen(lines[1]));
+  assert_memory_equal("The third line\n", lines[2], strlen(lines[2]));
+  assert_memory_equal("Fourth line", lines[3], strlen(lines[3]));
+
+  for (int i = 0; i < SUBSTR_NUM; i++) {
+    free(lines[i]);
+  }
+}
+
+void test_query_extract_from_buf_empty(void **state) {
+  session sess = {.buf = "", .buf_used = 0};
+  char *line = NULL;
+  int ret = query_extract_from_buf(&sess, &line);
+  assert_null(line);
+  assert_int_equal(ret, 0);
+}
+
+int setup(void **state) { return 0; }
+int tear_down(void **state) { return 0; }
+
+int main(int argc, char **argv) {
+  const struct CMUnitTest tests[] = {
+      cmocka_unit_test(test_query_extract_from_buf_filled),
+      cmocka_unit_test(test_query_extract_from_buf_empty)
+    };
+
+  return cmocka_run_group_tests(tests, setup, tear_down);
+}