329 lines
10 KiB
Rust
329 lines
10 KiB
Rust
#![allow(clippy::collapsible_else_if)]
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use std::borrow::Cow;
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use std::collections::HashMap;
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use std::path::{Path, PathBuf};
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use std::{env, fs, io, mem};
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use snapbox::cmd::{Command, OutputAssert};
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use snapbox::{Assert, Substitutions};
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use thiserror::Error;
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/// Error lines in the CLI are prefixed with this string.
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const ERROR_PREFIX: &str = "==";
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#[derive(Error, Debug)]
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pub enum Error {
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#[error("parsing failed")]
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Parse,
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#[error("test file not found: {0:?}")]
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TestNotFound(PathBuf),
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#[error("i/o: {0}")]
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Io(#[from] io::Error),
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#[error("snapbox: {0}")]
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Snapbox(#[from] snapbox::Error),
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}
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#[derive(Debug, PartialEq, Eq)]
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enum ExitStatus {
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Success,
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Failure,
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}
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/// A test which may contain multiple assertions.
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#[derive(Debug, Default, PartialEq, Eq)]
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pub struct Test {
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/// Human-readable context around the test. Functions as documentation.
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context: Vec<String>,
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/// Test assertions to run.
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assertions: Vec<Assertion>,
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}
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/// An assertion is a command to run with an expected output.
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#[derive(Debug, PartialEq, Eq)]
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pub struct Assertion {
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/// Name of command to run, eg. `git`.
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command: String,
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/// Command arguments, eg. `["push"]`.
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args: Vec<String>,
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/// Expected output (stdout or stderr).
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expected: String,
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/// Expected exit status.
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exit: ExitStatus,
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}
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#[derive(Debug, Default, PartialEq, Eq)]
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pub struct TestFormula {
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/// Current working directory to run the test in.
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cwd: PathBuf,
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/// Environment to pass to the test.
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env: HashMap<String, String>,
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/// Tests to run.
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tests: Vec<Test>,
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/// Output substitutions.
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subs: Substitutions,
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}
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impl TestFormula {
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pub fn new() -> Self {
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Self {
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cwd: PathBuf::new(),
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env: HashMap::new(),
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tests: Vec::new(),
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subs: Substitutions::new(),
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}
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}
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pub fn cwd(&mut self, path: impl AsRef<Path>) -> &mut Self {
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self.cwd = path.as_ref().into();
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self
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}
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pub fn env(&mut self, key: impl Into<String>, val: impl Into<String>) -> &mut Self {
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self.env.insert(key.into(), val.into());
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self
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}
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pub fn envs<K: ToString, V: ToString>(
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&mut self,
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envs: impl IntoIterator<Item = (K, V)>,
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) -> &mut Self {
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for (k, v) in envs {
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self.env.insert(k.to_string(), v.to_string());
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}
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self
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}
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pub fn file(&mut self, path: impl AsRef<Path>) -> Result<&mut Self, Error> {
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let path = path.as_ref();
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let contents = match fs::read(path) {
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Ok(bytes) => bytes,
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Err(err) if err.kind() == io::ErrorKind::NotFound => {
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return Err(Error::TestNotFound(path.to_path_buf()));
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}
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Err(err) => return Err(err.into()),
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};
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self.read(io::Cursor::new(contents))
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}
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pub fn read(&mut self, r: impl io::BufRead) -> Result<&mut Self, Error> {
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let mut test = Test::default();
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let mut fenced = false; // Whether we're inside a fenced code block.
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for line in r.lines() {
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let line = line?;
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if line.starts_with("```") {
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if fenced {
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// End existing code block.
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self.tests.push(mem::take(&mut test));
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}
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fenced = !fenced;
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continue;
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}
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if fenced {
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if let Some(line) = line.strip_prefix('$') {
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let line = line.trim();
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let parts = shlex::split(line).ok_or(Error::Parse)?;
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let (cmd, args) = parts.split_first().ok_or(Error::Parse)?;
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test.assertions.push(Assertion {
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command: cmd.to_owned(),
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args: args.to_owned(),
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expected: String::new(),
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exit: ExitStatus::Success,
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});
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} else if let Some(test) = test.assertions.last_mut() {
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if line.starts_with(ERROR_PREFIX) {
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test.exit = ExitStatus::Failure;
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}
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test.expected.push_str(line.as_str());
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test.expected.push('\n');
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} else {
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return Err(Error::Parse);
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}
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} else {
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test.context.push(line);
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}
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}
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Ok(self)
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}
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#[allow(dead_code)]
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pub fn substitute(
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&mut self,
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value: &'static str,
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other: impl Into<Cow<'static, str>>,
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) -> Result<&mut Self, Error> {
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self.subs.insert(value, other)?;
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Ok(self)
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}
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pub fn run(&mut self) -> Result<bool, io::Error> {
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let assert = Assert::new().substitutions(self.subs.clone());
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fs::create_dir_all(&self.cwd)?;
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for test in &self.tests {
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for assertion in &test.assertions {
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let cmd = if assertion.command == "rad" {
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snapbox::cmd::cargo_bin("rad")
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} else if assertion.command == "cd" {
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let path: PathBuf = assertion.args.first().unwrap().into();
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let path = self.cwd.join(path);
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// TODO: Add support for `..` and `/`
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// TODO: Error if more than one args are given.
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if !path.exists() {
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return Err(io::Error::new(
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io::ErrorKind::NotFound,
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format!("cd: '{}' does not exist", path.display()),
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));
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}
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self.cwd = path;
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continue;
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} else {
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PathBuf::from(&assertion.command)
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};
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log::debug!(target: "test", "Running `{}` in `{}`..", cmd.display(), self.cwd.display());
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if !self.cwd.exists() {
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log::error!(target: "test", "Directory {} does not exist..", self.cwd.display());
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}
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let result = Command::new(cmd.clone())
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.env_clear()
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.envs(env::vars().filter(|(k, _)| k == "PATH"))
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.envs(self.env.clone())
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.current_dir(&self.cwd)
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.args(&assertion.args)
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.with_assert(assert.clone())
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.output();
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match result {
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Ok(output) => {
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let assert = OutputAssert::new(output).with_assert(assert.clone());
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match assertion.exit {
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ExitStatus::Success => {
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assert.stdout_matches(&assertion.expected).success();
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}
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ExitStatus::Failure => {
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assert.stdout_matches(&assertion.expected).failure();
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}
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}
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}
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Err(err) => {
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if err.kind() == io::ErrorKind::NotFound {
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log::error!(target: "test", "Command `{}` does not exist..", cmd.display());
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}
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return Err(io::Error::new(
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err.kind(),
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format!("{err}: `{}`", cmd.display()),
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));
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}
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}
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}
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}
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Ok(true)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use pretty_assertions::assert_eq;
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#[test]
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fn test_parse() {
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let input = r#"
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Let's try to track @dave and @sean:
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```
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$ rad track @dave
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Tracking relationship established for @dave.
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Nothing to do.
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$ rad track @sean
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Tracking relationship established for @sean.
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Nothing to do.
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```
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Super, now let's move on to the next step.
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```
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$ rad sync
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```
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"#
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.trim()
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.as_bytes()
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.to_owned();
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let mut actual = TestFormula::new();
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actual
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.read(io::BufReader::new(io::Cursor::new(input)))
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.unwrap();
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let expected = TestFormula {
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cwd: PathBuf::new(),
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env: HashMap::new(),
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subs: Substitutions::new(),
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tests: vec![
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Test {
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context: vec![String::from("Let's try to track @dave and @sean:")],
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assertions: vec![
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Assertion {
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command: String::from("rad"),
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args: vec![String::from("track"), String::from("@dave")],
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expected: String::from(
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"Tracking relationship established for @dave.\nNothing to do.\n\n",
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),
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exit: ExitStatus::Success,
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},
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Assertion {
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command: String::from("rad"),
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args: vec![String::from("track"), String::from("@sean")],
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expected: String::from(
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"Tracking relationship established for @sean.\nNothing to do.\n",
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),
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exit: ExitStatus::Success,
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},
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],
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},
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Test {
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context: vec![String::from("Super, now let's move on to the next step.")],
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assertions: vec![Assertion {
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command: String::from("rad"),
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args: vec![String::from("sync")],
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expected: String::new(),
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exit: ExitStatus::Success,
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}],
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},
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],
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};
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assert_eq!(actual, expected);
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}
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#[test]
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fn test_run() {
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let input = r#"
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Running a simple command such as `head`:
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```
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$ head -n 2 Cargo.toml
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[package]
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name = "radicle-cli"
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```
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"#
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.trim()
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.as_bytes()
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.to_owned();
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let mut formula = TestFormula::new();
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formula
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.cwd(env!("CARGO_MANIFEST_DIR"))
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.read(io::BufReader::new(io::Cursor::new(input)))
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.unwrap();
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formula.run().unwrap();
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}
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}
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