bat/tests/tester.rs
2018-05-12 18:07:30 +02:00

76 lines
2.0 KiB
Rust

use std::env;
use std::fs::{self, File};
use std::io::Read;
use std::path::PathBuf;
use std::process::Command;
pub struct BatTester {
exe: PathBuf,
}
impl BatTester {
pub fn new() -> Self {
modify_sample_file();
// Lifted from fd :)
let root = env::current_exe()
.expect("tests executable")
.parent()
.expect("tests executable directory")
.parent()
.expect("bat executable directory")
.to_path_buf();
let exe_name = if cfg!(windows) { "bat.exe" } else { "bat" };
BatTester {
exe: root.join(exe_name),
}
}
pub fn test_snapshot(&self, style: &str) {
let output = Command::new(&self.exe)
.args(&[
"tests/snapshots/sample.rs",
&format!("--style={}", style),
])
.output()
.expect("bat failed");
// have to do the replace because the filename in the header changes based on the current working directory
let actual = String::from_utf8_lossy(&output.stdout)
.as_ref()
.replace("tests/snapshots/", "");
let mut expected = String::new();
let mut file = File::open(format!("tests/snapshots/output/{}.snapshot.txt", style))
.expect("snapshot file missing");
file.read_to_string(&mut expected)
.expect("could not read snapshot file");
assert_eq!(expected, actual);
}
}
impl Drop for BatTester {
fn drop(&mut self) {
undo_sample_file_modification();
}
}
fn modify_sample_file() {
fs::copy(
"tests/snapshots/sample.modified.rs",
"tests/snapshots/sample.rs",
).expect("generating modified sample file failed");
}
fn undo_sample_file_modification() {
let output = Command::new("git")
.args(&["checkout", "--", "tests/snapshots/sample.rs"])
.output()
.expect("git checkout failed");
if !output.status.success() {
panic!("undoing modified sample changes failed")
}
}