rustlings/tests/integration_tests.rs

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use std::{
env::{self, consts::EXE_SUFFIX},
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fs,
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process::{Command, Stdio},
str::from_utf8,
};
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enum Output<'a> {
FullStdout(&'a str),
PartialStdout(&'a str),
PartialStderr(&'a str),
}
use Output::*;
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#[derive(Default)]
struct Cmd<'a> {
current_dir: Option<&'a str>,
args: &'a [&'a str],
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output: Option<Output<'a>>,
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}
impl<'a> Cmd<'a> {
#[inline]
fn current_dir(&mut self, current_dir: &'a str) -> &mut Self {
self.current_dir = Some(current_dir);
self
}
#[inline]
fn args(&mut self, args: &'a [&'a str]) -> &mut Self {
self.args = args;
self
}
#[inline]
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fn output(&mut self, output: Output<'a>) -> &mut Self {
self.output = Some(output);
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self
}
fn assert(&self, success: bool) {
let rustlings_bin = {
let mut path = env::current_exe().unwrap();
// Pop test binary name
path.pop();
// Pop `/deps`
path.pop();
path.push("rustlings");
let mut path = path.into_os_string();
path.push(EXE_SUFFIX);
path
};
let mut cmd = Command::new(rustlings_bin);
if let Some(current_dir) = self.current_dir {
cmd.current_dir(current_dir);
}
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cmd.args(self.args).stdin(Stdio::null());
let status = match self.output {
None => cmd
.stdout(Stdio::null())
.stderr(Stdio::null())
.status()
.unwrap(),
Some(FullStdout(stdout)) => {
let output = cmd.stderr(Stdio::null()).output().unwrap();
assert_eq!(from_utf8(&output.stdout).unwrap(), stdout);
output.status
}
Some(PartialStdout(stdout)) => {
let output = cmd.stderr(Stdio::null()).output().unwrap();
assert!(from_utf8(&output.stdout).unwrap().contains(stdout));
output.status
}
Some(PartialStderr(stderr)) => {
let output = cmd.stdout(Stdio::null()).output().unwrap();
assert!(from_utf8(&output.stderr).unwrap().contains(stderr));
output.status
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}
};
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assert_eq!(status.success(), success, "{cmd:?}");
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}
#[inline]
fn success(&self) {
self.assert(true);
}
#[inline]
fn fail(&self) {
self.assert(false);
}
}
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#[test]
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fn run_compilation_success() {
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Cmd::default()
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.current_dir("tests/test_exercises")
.args(&["run", "compilation_success"])
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.success();
}
#[test]
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fn run_compilation_failure() {
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Cmd::default()
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.current_dir("tests/test_exercises")
.args(&["run", "compilation_failure"])
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.fail();
}
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#[test]
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fn run_test_success() {
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Cmd::default()
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.current_dir("tests/test_exercises")
.args(&["run", "test_success"])
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.output(PartialStdout("\nOutput from `main` function\n"))
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.success();
}
#[test]
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fn run_test_failure() {
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Cmd::default()
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.current_dir("tests/test_exercises")
.args(&["run", "test_failure"])
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.fail();
}
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#[test]
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fn run_exercise_not_in_info() {
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Cmd::default()
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.current_dir("tests/test_exercises")
.args(&["run", "not_in_info"])
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.fail();
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}
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#[test]
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fn reset_without_exercise_name() {
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Cmd::default().args(&["reset"]).fail();
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}
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#[test]
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fn hint() {
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Cmd::default()
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.current_dir("tests/test_exercises")
.args(&["hint", "test_failure"])
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.output(FullStdout("The answer to everything: 42\n"))
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.success();
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}
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#[test]
fn init() {
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let test_dir = tempfile::TempDir::new().unwrap();
let initialized_dir = test_dir.path().join("rustlings");
let test_dir = test_dir.path().to_str().unwrap();
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Cmd::default().current_dir(test_dir).fail();
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Cmd::default()
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.current_dir(test_dir)
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.args(&["init"])
.success();
// Running `init` after a successful initialization.
Cmd::default()
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.current_dir(test_dir)
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.args(&["init"])
.output(PartialStderr("`cd rustlings`"))
.fail();
// Running `init` in the initialized directory.
Cmd::default()
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.current_dir(initialized_dir.to_str().unwrap())
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.args(&["init"])
.output(PartialStderr("already initialized"))
.fail();
}