test_truncate
.truncate = test_truncate,
EXPECT_EQ(0, test_truncate(file_r));
EXPECT_EQ(0, test_truncate(file_w));
EXPECT_EQ(0, test_truncate(file_none));
EXPECT_EQ(0, test_truncate(file_rwt));
EXPECT_EQ(EACCES, test_truncate(file_rw));
EXPECT_EQ(0, test_truncate(file_rt));
EXPECT_EQ(0, test_truncate(file_t));
EXPECT_EQ(EACCES, test_truncate(file_none));
EXPECT_EQ(0, test_truncate(file_in_dir_t));