diff --git a/test/file_p/CMakeLists.txt b/test/file_p/CMakeLists.txt
index bf9b4df..56d5122 100644
--- a/test/file_p/CMakeLists.txt
+++ b/test/file_p/CMakeLists.txt
@@ -61,6 +61,6 @@ target_link_libraries(file_send_prepare
     utils
 )
 
-target_link_options(file_list PRIVATE -Wl,--wrap=db_get_files_data,--wrap=write,--wrap=print_log,--wrap=lseek,--wrap=open)
+target_link_options(file_send_prepare PRIVATE -Wl,--wrap=write,--wrap=print_log,--wrap=lseek,--wrap=open,--wrap=db_get_file)
 
 add_test(NAME file_p_file_send_prepare_test_1 COMMAND file_send_prepare)
\ No newline at end of file
diff --git a/test/file_p/file_send_prepare.c b/test/file_p/file_send_prepare.c
index 7a8e252..87d8c92 100644
--- a/test/file_p/file_send_prepare.c
+++ b/test/file_p/file_send_prepare.c
@@ -17,10 +17,14 @@
 
 dbuf_t *dbuf;
 
-/* TODO: finish */
+#define FSIZE 10233
+#define FNAME "Test file"
+#define FHASH 211212
+#define FID 19
+#define FID_S "19"
 
-int __wrap_print_log(FILE *output, enum pl_type type, const char *format_message,
-              ...) {
+int __wrap_print_log(FILE *output, enum pl_type type,
+                     const char *format_message, ...) {
   return 0;
 };
 
@@ -29,20 +33,94 @@ ssize_t __wrap_write(int __fd, const void *__buf, size_t __n) __wur {
   return __n;
 }
 
-__off_t __wrap_lseek (int __fd, __off_t __offset, int __whence) __THROW {
+__off_t __wrap_lseek(int __fd, __off_t __offset, int __whence) {
   return mock_type(int);
 }
 
-int __wrap_open(const char *__file, int __oflag, ...) {
-  return mock_type(int);
+s_file_t *__wrap_db_get_file(i_get_file_db *arg) {
+  assert_string_equal(arg->name, FNAME);
+  return mock_type(s_file_t *);
 }
 
+int __wrap_open(const char *__file, int __oflag, ...) { return mock_type(int); }
+
 void test__file_send_prepare(void **state) {
-  dbuf_t *dbuf = dbuf_init(INBUFSIZE);
+  s_file_t file = {.name = FNAME, .size = FSIZE, .hash = FHASH, .id = FID};
+  char line[] = "[" FNAME "]";
   session sess = {
-    .uname = "user1234",
-    .sd = 0,
+      .uname = "user1234",
+      .sd = 0,
+      .file = NULL,
   };
+  int res = 0;
+
+  will_return(__wrap_db_get_file, &file);
+  will_return(__wrap_open, 5);
+  will_return(__wrap_lseek, FSIZE);
+  will_return(__wrap_lseek, 0);
+  res = file_send_prepare(&sess, line, NULL);
+  assert_int_equal(res, 0);
+  assert_ptr_not_equal(sess.file, NULL);
+  assert_int_equal(file.rest, FSIZE);
+  assert_string_equal(file.path, "./storage/00/03390c");
+}
+
+void test__file_send_prepare__db_no_file(void **state) {
+  char line[] = "[" FNAME "]";
+  session sess = {
+      .uname = "user1234",
+      .sd = 0,
+      .file = NULL,
+  };
+  int res = 0;
+
+  will_return(__wrap_db_get_file, NULL);
+  res = file_send_prepare(&sess, line, NULL);
+  assert_int_equal(res, -1);
+  assert_int_equal(sess.file, NULL);
+}
+
+void test__file_send_prepare__no_open(void **state) {
+  dbuf = dbuf_init(INBUFSIZE);
+  s_file_t file = {.name = FNAME, .size = FSIZE, .hash = FHASH, .id = FID};
+  char line[] = "[" FNAME "]";
+  session sess = {
+      .uname = "user1234",
+      .sd = 0,
+      .file = NULL,
+  };
+  int res = 0;
+
+  will_return(__wrap_db_get_file, &file);
+  will_return(__wrap_open, -1);
+  res = file_send_prepare(&sess, line, NULL);
+  assert_int_equal(res, -2);
+  assert_ptr_not_equal(sess.file, NULL);
+  assert_string_equal("Can't open file with id = " FID_S "\n", dbuf->ptr);
+  dbuf_destroy(&dbuf);
+}
+
+void test__file_send_prepare__size_not_correct(void **state) {
+  dbuf = dbuf_init(INBUFSIZE);
+  s_file_t file = {.name = FNAME, .size = FSIZE, .hash = FHASH, .id = FID};
+  char line[] = "[" FNAME "]";
+  session sess = {
+      .uname = "user1234",
+      .sd = 0,
+      .file = NULL,
+  };
+  int res = 0;
+
+  will_return(__wrap_db_get_file, &file);
+  will_return(__wrap_open, 5);
+  will_return(__wrap_lseek, FSIZE - 1);
+  will_return(__wrap_lseek, 0);
+  res = file_send_prepare(&sess, line, NULL);
+  assert_int_equal(res, -3);
+  assert_ptr_not_equal(sess.file, NULL);
+  assert_string_equal(file.path, "./storage/00/03390c");
+  assert_string_equal("File with id = " FID_S " exists, but seems to be damaged\n", dbuf->ptr);
+  dbuf_destroy(&dbuf);
 }
 
 int setup(void **state) { return 0; }
@@ -51,6 +129,9 @@ int tear_down(void **state) { return 0; }
 int main(int argc, char **argv) {
   const struct CMUnitTest tests[] = {
       cmocka_unit_test(test__file_send_prepare),
+      cmocka_unit_test(test__file_send_prepare__no_open),
+      cmocka_unit_test(test__file_send_prepare__db_no_file),
+      cmocka_unit_test(test__file_send_prepare__size_not_correct),
   };
 
   return cmocka_run_group_tests(tests, setup, tear_down);
diff --git a/test/user/create_user.c b/test/user/create_user.c
index 4518d5b..79d0714 100644
--- a/test/user/create_user.c
+++ b/test/user/create_user.c
@@ -49,10 +49,9 @@ void test__create_user__partial(void **state) {
   session sess = {};
   i_db_user_create p;
   int32_t ret = 0;
-  char line[1024];
+  char line[1024] = "register " UNAME " " PASS "\n";
 
   /* Less args */
-  sprintf(line, "register %s %s\n", UNAME, PASS);
   ret = create_user(&sess, line);
   assert_int_equal(ret, 0);  
 
diff --git a/test/user/db_user_create.c b/test/user/db_user_create.c
index be71341..26ef418 100644
--- a/test/user/db_user_create.c
+++ b/test/user/db_user_create.c
@@ -28,8 +28,7 @@ void test_create_user(void **state) {
   session sess = {};
   i_db_user_create p;
   int32_t ret = 0;
-  char line[sizeof "register" + sizeof UNAME + sizeof PASS + sizeof EMAIL + 5];
-  sprintf(line, "register %s %s %s\n", UNAME, PASS, EMAIL);
+  char line[] = "register " UNAME " " PASS " " EMAIL "\n";
   will_return(__wrap_db_user_create, 123);
   ret = create_user(&sess, line);
   assert_int_equal(ret, 123);
diff --git a/test/user/login.c b/test/user/login.c
index 04df8e2..d059de0 100644
--- a/test/user/login.c
+++ b/test/user/login.c
@@ -42,8 +42,7 @@ void test_create_login_success(void **state) {
   // assert_int_not_equal(sess.privileges, 0);
   assert_int_equal(sess.state, OP_WAIT);
 
-  char welcome_mes[sizeof "Welcome, " + sizeof UNAME + 5];
-  sprintf(welcome_mes, "Welcome, %s\n", UNAME);
+  char welcome_mes[] = "Welcome, " UNAME "\n";
   assert_string_equal(welcome_mes, ret_buf);
 }