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helpers.rs
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/
helpers.rs
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use std::{
fs::File,
io::{Read, Write},
path::PathBuf,
time::Duration,
};
use anyhow::bail;
use crossterm::event::{Event, KeyEvent};
use helix_core::{diagnostic::Severity, test, Selection, Transaction};
use helix_term::{application::Application, args::Args, config::Config, keymap::merge_keys};
use helix_view::{current_ref, doc, editor::LspConfig, input::parse_macro, Editor};
use tempfile::NamedTempFile;
use tokio_stream::wrappers::UnboundedReceiverStream;
#[derive(Clone, Debug)]
pub struct TestCase {
pub in_text: String,
pub in_selection: Selection,
pub in_keys: String,
pub out_text: String,
pub out_selection: Selection,
}
impl<S, R, V> From<(S, R, V)> for TestCase
where
S: Into<String>,
R: Into<String>,
V: Into<String>,
{
fn from((input, keys, output): (S, R, V)) -> Self {
let (in_text, in_selection) = test::print(&input.into());
let (out_text, out_selection) = test::print(&output.into());
TestCase {
in_text,
in_selection,
in_keys: keys.into(),
out_text,
out_selection,
}
}
}
#[inline]
pub async fn test_key_sequence(
app: &mut Application,
in_keys: Option<&str>,
test_fn: Option<&dyn Fn(&Application)>,
should_exit: bool,
) -> anyhow::Result<()> {
test_key_sequences(app, vec![(in_keys, test_fn)], should_exit).await
}
#[allow(clippy::type_complexity)]
pub async fn test_key_sequences(
app: &mut Application,
inputs: Vec<(Option<&str>, Option<&dyn Fn(&Application)>)>,
should_exit: bool,
) -> anyhow::Result<()> {
const TIMEOUT: Duration = Duration::from_millis(500);
let (tx, rx) = tokio::sync::mpsc::unbounded_channel();
let mut rx_stream = UnboundedReceiverStream::new(rx);
let num_inputs = inputs.len();
for (i, (in_keys, test_fn)) in inputs.into_iter().enumerate() {
let (view, doc) = current_ref!(app.editor);
let state = test::plain(doc.text().slice(..), doc.selection(view.id));
log::debug!("executing test with document state:\n\n-----\n\n{}", state);
if let Some(in_keys) = in_keys {
for key_event in parse_macro(in_keys)?.into_iter() {
let key = Event::Key(KeyEvent::from(key_event));
log::trace!("sending key: {:?}", key);
tx.send(Ok(key))?;
}
}
let app_exited = !app.event_loop_until_idle(&mut rx_stream).await;
if !app_exited {
let (view, doc) = current_ref!(app.editor);
let state = test::plain(doc.text().slice(..), doc.selection(view.id));
log::debug!(
"finished running test with document state:\n\n-----\n\n{}",
state
);
}
// the app should not exit from any test until the last one
if i < num_inputs - 1 && app_exited {
bail!("application exited before test function could run");
}
// verify if it exited on the last iteration if it should have and
// the inverse
if i == num_inputs - 1 && app_exited != should_exit {
bail!("expected app to exit: {} != {}", should_exit, app_exited);
}
if let Some(test) = test_fn {
test(app);
};
}
if !should_exit {
for key_event in parse_macro("<esc>:q!<ret>")?.into_iter() {
tx.send(Ok(Event::Key(KeyEvent::from(key_event))))?;
}
let event_loop = app.event_loop(&mut rx_stream);
tokio::time::timeout(TIMEOUT, event_loop).await?;
}
let errs = app.close().await;
if !errs.is_empty() {
log::error!("Errors closing app");
for err in errs {
log::error!("{}", err);
}
bail!("Error closing app");
}
Ok(())
}
pub async fn test_key_sequence_with_input_text<T: Into<TestCase>>(
app: Option<Application>,
test_case: T,
test_fn: &dyn Fn(&Application),
should_exit: bool,
) -> anyhow::Result<()> {
let test_case = test_case.into();
let mut app = match app {
Some(app) => app,
None => Application::new(Args::default(), test_config(), test_syntax_conf(None))?,
};
let (view, doc) = helix_view::current!(app.editor);
let sel = doc.selection(view.id).clone();
// replace the initial text with the input text
let transaction = Transaction::change_by_selection(doc.text(), &sel, |_| {
(0, doc.text().len_chars(), Some((&test_case.in_text).into()))
})
.with_selection(test_case.in_selection.clone());
doc.apply(&transaction, view.id);
test_key_sequence(
&mut app,
Some(&test_case.in_keys),
Some(test_fn),
should_exit,
)
.await
}
/// Generates language configs that merge in overrides, like a user language
/// config. The argument string must be a raw TOML document.
pub fn test_syntax_conf(overrides: Option<String>) -> helix_core::syntax::Configuration {
let mut lang = helix_loader::config::default_lang_config();
if let Some(overrides) = overrides {
let override_toml = toml::from_str(&overrides).unwrap();
lang = helix_loader::merge_toml_values(lang, override_toml, 3);
}
lang.try_into().unwrap()
}
/// Use this for very simple test cases where there is one input
/// document, selection, and sequence of key presses, and you just
/// want to verify the resulting document and selection.
pub async fn test_with_config<T: Into<TestCase>>(
app_builder: AppBuilder,
test_case: T,
) -> anyhow::Result<()> {
let test_case = test_case.into();
let app = app_builder.build()?;
test_key_sequence_with_input_text(
Some(app),
test_case.clone(),
&|app| {
let doc = doc!(app.editor);
assert_eq!(&test_case.out_text, doc.text());
let mut selections: Vec<_> = doc.selections().values().cloned().collect();
assert_eq!(1, selections.len());
let sel = selections.pop().unwrap();
assert_eq!(test_case.out_selection, sel);
},
false,
)
.await
}
pub async fn test<T: Into<TestCase>>(test_case: T) -> anyhow::Result<()> {
test_with_config(AppBuilder::default(), test_case).await
}
pub fn temp_file_with_contents<S: AsRef<str>>(
content: S,
) -> anyhow::Result<tempfile::NamedTempFile> {
let mut temp_file = tempfile::NamedTempFile::new()?;
temp_file
.as_file_mut()
.write_all(content.as_ref().as_bytes())?;
temp_file.flush()?;
temp_file.as_file_mut().sync_all()?;
Ok(temp_file)
}
/// Generates a config with defaults more suitable for integration tests
pub fn test_config() -> Config {
merge_keys(Config {
editor: test_editor_config(),
..Default::default()
})
}
pub fn test_editor_config() -> helix_view::editor::Config {
helix_view::editor::Config {
lsp: LspConfig {
enable: false,
..Default::default()
},
..Default::default()
}
}
/// Replaces all LF chars with the system's appropriate line feed
/// character, and if one doesn't exist already, appends the system's
/// appropriate line ending to the end of a string.
pub fn platform_line(input: &str) -> String {
let line_end = helix_core::DEFAULT_LINE_ENDING.as_str();
// we can assume that the source files in this code base will always
// be LF, so indoc strings will always insert LF
let mut output = input.replace('\n', line_end);
if !output.ends_with(line_end) {
output.push_str(line_end);
}
output
}
/// Creates a new temporary file that is set to read only. Useful for
/// testing write failures.
pub fn new_readonly_tempfile() -> anyhow::Result<NamedTempFile> {
let mut file = tempfile::NamedTempFile::new()?;
let metadata = file.as_file().metadata()?;
let mut perms = metadata.permissions();
perms.set_readonly(true);
file.as_file_mut().set_permissions(perms)?;
Ok(file)
}
pub struct AppBuilder {
args: Args,
config: Config,
syn_conf: helix_core::syntax::Configuration,
input: Option<(String, Selection)>,
}
impl Default for AppBuilder {
fn default() -> Self {
Self {
args: Args::default(),
config: test_config(),
syn_conf: test_syntax_conf(None),
input: None,
}
}
}
impl AppBuilder {
pub fn new() -> Self {
AppBuilder::default()
}
pub fn with_file<P: Into<PathBuf>>(
mut self,
path: P,
pos: Option<helix_core::Position>,
) -> Self {
self.args.files.push((path.into(), pos.unwrap_or_default()));
self
}
// Remove this attribute once `with_config` is used in a test:
#[allow(dead_code)]
pub fn with_config(mut self, config: Config) -> Self {
self.config = helix_term::keymap::merge_keys(config);
self
}
pub fn with_input_text<S: Into<String>>(mut self, input_text: S) -> Self {
self.input = Some(test::print(&input_text.into()));
self
}
pub fn with_lang_config(mut self, syn_conf: helix_core::syntax::Configuration) -> Self {
self.syn_conf = syn_conf;
self
}
pub fn build(self) -> anyhow::Result<Application> {
let mut app = Application::new(self.args, self.config, self.syn_conf)?;
if let Some((text, selection)) = self.input {
let (view, doc) = helix_view::current!(app.editor);
let sel = doc.selection(view.id).clone();
let trans = Transaction::change_by_selection(doc.text(), &sel, |_| {
(0, doc.text().len_chars(), Some((text.clone()).into()))
})
.with_selection(selection);
// replace the initial text with the input text
doc.apply(&trans, view.id);
}
Ok(app)
}
}
pub async fn run_event_loop_until_idle(app: &mut Application) {
let (_, rx) = tokio::sync::mpsc::unbounded_channel();
let mut rx_stream = UnboundedReceiverStream::new(rx);
app.event_loop_until_idle(&mut rx_stream).await;
}
pub fn assert_file_has_content(file: &mut File, content: &str) -> anyhow::Result<()> {
file.flush()?;
file.sync_all()?;
let mut file_content = String::new();
file.read_to_string(&mut file_content)?;
assert_eq!(content, file_content);
Ok(())
}
pub fn assert_status_not_error(editor: &Editor) {
if let Some((_, sev)) = editor.get_status() {
assert_ne!(&Severity::Error, sev);
}
}