7 files changed, 634 insertions, 0 deletions
diff --git a/helix-term/tests/integration.rs b/helix-term/tests/integration.rs
new file mode 100644
index 00000000..11bc4e4c
--- /dev/null
+++ b/helix-term/tests/integration.rs
@@ -0,0 +1,25 @@
+#[cfg(feature = "integration")]
+mod test {
+    mod helpers;
+
+    use std::path::PathBuf;
+
+    use helix_core::{syntax::AutoPairConfig, Position, Selection};
+    use helix_term::{args::Args, config::Config};
+
+    use indoc::indoc;
+
+    use self::helpers::*;
+
+    #[tokio::test]
+    async fn hello_world() -> anyhow::Result<()> {
+        test(("#[\n|]#", "ihello world<esc>", "hello world#[|\n]#")).await?;
+        Ok(())
+    }
+
+    mod auto_indent;
+    mod auto_pairs;
+    mod commands;
+    mod movement;
+    mod write;
+}
diff --git a/helix-term/tests/test/auto_indent.rs b/helix-term/tests/test/auto_indent.rs
new file mode 100644
index 00000000..2f638893
--- /dev/null
+++ b/helix-term/tests/test/auto_indent.rs
@@ -0,0 +1,26 @@
+use super::*;
+
+#[tokio::test]
+async fn auto_indent_c() -> anyhow::Result<()> {
+    test_with_config(
+        Args {
+            files: vec![(PathBuf::from("foo.c"), Position::default())],
+            ..Default::default()
+        },
+        Config::default(),
+        // switches to append mode?
+        (
+            helpers::platform_line("void foo() {#[|}]#").as_ref(),
+            "i<ret><esc>",
+            helpers::platform_line(indoc! {"\
+                void foo() {
+                  #[|\n]#\
+                }
+            "})
+            .as_ref(),
+        ),
+    )
+    .await?;
+
+    Ok(())
+}
diff --git a/helix-term/tests/test/auto_pairs.rs b/helix-term/tests/test/auto_pairs.rs
new file mode 100644
index 00000000..ec47a5b4
--- /dev/null
+++ b/helix-term/tests/test/auto_pairs.rs
@@ -0,0 +1,21 @@
+use super::*;
+
+#[tokio::test]
+async fn auto_pairs_basic() -> anyhow::Result<()> {
+    test(("#[\n|]#", "i(<esc>", "(#[|)]#\n")).await?;
+
+    test_with_config(
+        Args::default(),
+        Config {
+            editor: helix_view::editor::Config {
+                auto_pairs: AutoPairConfig::Enable(false),
+                ..Default::default()
+            },
+            ..Default::default()
+        },
+        ("#[\n|]#", "i(<esc>", "(#[|\n]#"),
+    )
+    .await?;
+
+    Ok(())
+}
diff --git a/helix-term/tests/test/commands.rs b/helix-term/tests/test/commands.rs
new file mode 100644
index 00000000..0cd79bc7
--- /dev/null
+++ b/helix-term/tests/test/commands.rs
@@ -0,0 +1,93 @@
+use std::{
+    io::{Read, Write},
+    ops::RangeInclusive,
+};
+
+use helix_core::diagnostic::Severity;
+use helix_term::application::Application;
+
+use super::*;
+
+#[tokio::test]
+async fn test_write_quit_fail() -> anyhow::Result<()> {
+    let file = helpers::new_readonly_tempfile()?;
+
+    test_key_sequence(
+        &mut helpers::app_with_file(file.path())?,
+        Some("ihello<esc>:wq<ret>"),
+        Some(&|app| {
+            assert_eq!(&Severity::Error, app.editor.get_status().unwrap().1);
+        }),
+        false,
+    )
+    .await?;
+
+    Ok(())
+}
+
+#[tokio::test]
+#[ignore]
+async fn test_buffer_close_concurrent() -> anyhow::Result<()> {
+    test_key_sequences(
+        &mut Application::new(Args::default(), Config::default())?,
+        vec![
+            (
+                None,
+                Some(&|app| {
+                    assert_eq!(1, app.editor.documents().count());
+                    assert!(!app.editor.is_err());
+                }),
+            ),
+            (
+                Some("ihello<esc>:new<ret>"),
+                Some(&|app| {
+                    assert_eq!(2, app.editor.documents().count());
+                    assert!(!app.editor.is_err());
+                }),
+            ),
+            (
+                Some(":buffer<minus>close<ret>"),
+                Some(&|app| {
+                    assert_eq!(1, app.editor.documents().count());
+                    assert!(!app.editor.is_err());
+                }),
+            ),
+        ],
+        false,
+    )
+    .await?;
+
+    // verify if writes are queued up, it finishes them before closing the buffer
+    let mut file = tempfile::NamedTempFile::new()?;
+    let mut command = String::new();
+    const RANGE: RangeInclusive<i32> = 1..=1000;
+
+    for i in RANGE {
+        let cmd = format!("%c{}<esc>:w<ret>", i);
+        command.push_str(&cmd);
+    }
+
+    command.push_str(":buffer<minus>close<ret>");
+
+    test_key_sequence(
+        &mut helpers::app_with_file(file.path())?,
+        Some(&command),
+        Some(&|app| {
+            assert!(!app.editor.is_err(), "error: {:?}", app.editor.get_status());
+
+            let doc = app.editor.document_by_path(file.path());
+            assert!(doc.is_none(), "found doc: {:?}", doc);
+        }),
+        false,
+    )
+    .await?;
+
+    file.as_file_mut().flush()?;
+    file.as_file_mut().sync_all()?;
+
+    let mut file_content = String::new();
+    file.as_file_mut().read_to_string(&mut file_content)?;
+    assert_eq!(RANGE.end().to_string(), file_content);
+
+    Ok(())
+}
diff --git a/helix-term/tests/test/helpers.rs b/helix-term/tests/test/helpers.rs
new file mode 100644
index 00000000..8f2501e6
--- /dev/null
+++ b/helix-term/tests/test/helpers.rs
@@ -0,0 +1,213 @@
+use std::{io::Write, path::PathBuf, time::Duration};
+
+use anyhow::bail;
+use crossterm::event::{Event, KeyEvent};
+use helix_core::{test, Selection, Transaction};
+use helix_term::{application::Application, args::Args, config::Config};
+use helix_view::{doc, input::parse_macro};
+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: Into<String>> From<(S, S, S)> for TestCase {
+    fn from((input, keys, output): (S, S, S)) -> 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() {
+        if let Some(in_keys) = in_keys {
+            for key_event in parse_macro(in_keys)?.into_iter() {
+                tx.send(Ok(Event::Key(KeyEvent::from(key_event))))?;
+            }
+        }
+
+        let app_exited = !app.event_loop_until_idle(&mut rx_stream).await;
+
+        // 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: {} != {}", app_exited, should_exit);
+        }
+
+        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?;
+    }
+
+    app.close().await?;
+
+    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(), Config::default())?,
+    };
+
+    let (view, doc) = helix_view::current!(app.editor);
+    let sel = doc.selection(view.id).clone();
+
+    // replace the initial text with the input text
+    doc.apply(
+        &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()),
+        view.id,
+    );
+
+    test_key_sequence(
+        &mut app,
+        Some(&test_case.in_keys),
+        Some(test_fn),
+        should_exit,
+    )
+    .await
+}
+
+/// 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>>(
+    args: Args,
+    config: Config,
+    test_case: T,
+) -> anyhow::Result<()> {
+    let test_case = test_case.into();
+    let app = Application::new(args, config)?;
+
+    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(Args::default(), Config::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)
+}
+
+/// 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)
+}
+
+/// Creates a new Application with default config that opens the given file
+/// path
+pub fn app_with_file<P: Into<PathBuf>>(path: P) -> anyhow::Result<Application> {
+    Application::new(
+        Args {
+            files: vec![(path.into(), helix_core::Position::default())],
+            ..Default::default()
+        },
+        Config::default(),
+    )
+}
diff --git a/helix-term/tests/test/movement.rs b/helix-term/tests/test/movement.rs
new file mode 100644
index 00000000..088685df
--- /dev/null
+++ b/helix-term/tests/test/movement.rs
@@ -0,0 +1,87 @@
+use super::*;
+
+#[tokio::test]
+async fn insert_mode_cursor_position() -> anyhow::Result<()> {
+    test(TestCase {
+        in_text: String::new(),
+        in_selection: Selection::single(0, 0),
+        in_keys: "i".into(),
+        out_text: String::new(),
+        out_selection: Selection::single(0, 0),
+    })
+    .await?;
+
+    test(("#[\n|]#", "i", "#[|\n]#")).await?;
+    test(("#[\n|]#", "i<esc>", "#[|\n]#")).await?;
+    test(("#[\n|]#", "i<esc>i", "#[|\n]#")).await?;
+
+    Ok(())
+}
+
+/// Range direction is preserved when escaping insert mode to normal
+#[tokio::test]
+async fn insert_to_normal_mode_cursor_position() -> anyhow::Result<()> {
+    test(("#[f|]#oo\n", "vll<A-;><esc>", "#[|foo]#\n")).await?;
+    test((
+        indoc! {"\
+                #[f|]#oo
+                #(b|)#ar"
+        },
+        "vll<A-;><esc>",
+        indoc! {"\
+                #[|foo]#
+                #(|bar)#"
+        },
+    ))
+    .await?;
+
+    test((
+        indoc! {"\
+                #[f|]#oo
+                #(b|)#ar"
+        },
+        "a",
+        indoc! {"\
+                #[fo|]#o
+                #(ba|)#r"
+        },
+    ))
+    .await?;
+
+    test((
+        indoc! {"\
+                #[f|]#oo
+                #(b|)#ar"
+        },
+        "a<esc>",
+        indoc! {"\
+                #[f|]#oo
+                #(b|)#ar"
+        },
+    ))
+    .await?;
+
+    Ok(())
+}
+
+/// Ensure the very initial cursor in an opened file is the width of
+/// the first grapheme
+#[tokio::test]
+async fn cursor_position_newly_opened_file() -> anyhow::Result<()> {
+    let test = |content: &str, expected_sel: Selection| -> anyhow::Result<()> {
+        let file = helpers::temp_file_with_contents(content)?;
+        let mut app = helpers::app_with_file(file.path())?;
+
+        let (view, doc) = helix_view::current!(app.editor);
+        let sel = doc.selection(view.id).clone();
+        assert_eq!(expected_sel, sel);
+
+        Ok(())
+    };
+
+    test("foo", Selection::single(0, 1))?;
+    test("👨‍👩‍👧‍👦 foo", Selection::single(0, 7))?;
+    test("", Selection::single(0, 0))?;
+
+    Ok(())
+}
diff --git a/helix-term/tests/test/write.rs b/helix-term/tests/test/write.rs
new file mode 100644
index 00000000..8869d881
--- /dev/null
+++ b/helix-term/tests/test/write.rs
@@ -0,0 +1,169 @@
+use std::{
+    io::{Read, Write},
+    ops::RangeInclusive,
+};
+
+use helix_core::diagnostic::Severity;
+use helix_term::application::Application;
+use helix_view::doc;
+
+use super::*;
+
+#[tokio::test]
+async fn test_write() -> anyhow::Result<()> {
+    let mut file = tempfile::NamedTempFile::new()?;
+
+    test_key_sequence(
+        &mut helpers::app_with_file(file.path())?,
+        Some("ithe gostak distims the doshes<ret><esc>:w<ret>"),
+        None,
+        false,
+    )
+    .await?;
+
+    file.as_file_mut().flush()?;
+    file.as_file_mut().sync_all()?;
+
+    let mut file_content = String::new();
+    file.as_file_mut().read_to_string(&mut file_content)?;
+
+    assert_eq!(
+        helpers::platform_line("the gostak distims the doshes"),
+        file_content
+    );
+
+    Ok(())
+}
+
+#[tokio::test]
+async fn test_write_quit() -> anyhow::Result<()> {
+    let mut file = tempfile::NamedTempFile::new()?;
+
+    test_key_sequence(
+        &mut helpers::app_with_file(file.path())?,
+        Some("ithe gostak distims the doshes<ret><esc>:wq<ret>"),
+        None,
+        true,
+    )
+    .await?;
+
+    file.as_file_mut().flush()?;
+    file.as_file_mut().sync_all()?;
+
+    let mut file_content = String::new();
+    file.as_file_mut().read_to_string(&mut file_content)?;
+
+    assert_eq!(
+        helpers::platform_line("the gostak distims the doshes"),
+        file_content
+    );
+
+    Ok(())
+}
+
+#[tokio::test]
+#[ignore]
+async fn test_write_concurrent() -> anyhow::Result<()> {
+    let mut file = tempfile::NamedTempFile::new()?;
+    let mut command = String::new();
+    const RANGE: RangeInclusive<i32> = 1..=5000;
+
+    for i in RANGE {
+        let cmd = format!("%c{}<esc>:w<ret>", i);
+        command.push_str(&cmd);
+    }
+
+    test_key_sequence(
+        &mut helpers::app_with_file(file.path())?,
+        Some(&command),
+        None,
+        false,
+    )
+    .await?;
+
+    file.as_file_mut().flush()?;
+    file.as_file_mut().sync_all()?;
+
+    let mut file_content = String::new();
+    file.as_file_mut().read_to_string(&mut file_content)?;
+    assert_eq!(RANGE.end().to_string(), file_content);
+
+    Ok(())
+}
+
+#[tokio::test]
+#[ignore]
+async fn test_write_fail_mod_flag() -> anyhow::Result<()> {
+    let file = helpers::new_readonly_tempfile()?;
+
+    test_key_sequences(
+        &mut helpers::app_with_file(file.path())?,
+        vec![
+            (
+                None,
+                Some(&|app| {
+                    let doc = doc!(app.editor);
+                    assert!(!doc.is_modified());
+                }),
+            ),
+            (
+                Some("ihello<esc>"),
+                Some(&|app| {
+                    let doc = doc!(app.editor);
+                    assert!(doc.is_modified());
+                }),
+            ),
+            (
+                Some(":w<ret>"),
+                Some(&|app| {
+                    assert_eq!(&Severity::Error, app.editor.get_status().unwrap().1);
+
+                    let doc = doc!(app.editor);
+                    assert!(doc.is_modified());
+                }),
+            ),
+        ],
+        false,
+    )
+    .await?;
+
+    Ok(())
+}
+
+#[tokio::test]
+#[ignore]
+async fn test_write_fail_new_path() -> anyhow::Result<()> {
+    let file = helpers::new_readonly_tempfile()?;
+
+    test_key_sequences(
+        &mut Application::new(Args::default(), Config::default())?,
+        vec![
+            (
+                None,
+                Some(&|app| {
+                    let doc = doc!(app.editor);
+                    assert_ne!(
+                        Some(&Severity::Error),
+                        app.editor.get_status().map(|status| status.1)
+                    );
+                    assert_eq!(None, doc.path());
+                }),
+            ),
+            (
+                Some(&format!(":w {}<ret>", file.path().to_string_lossy())),
+                Some(&|app| {
+                    let doc = doc!(app.editor);
+                    assert_eq!(
+                        Some(&Severity::Error),
+                        app.editor.get_status().map(|status| status.1)
+                    );
+                    assert_eq!(None, doc.path());
+                }),
+            ),
+        ],
+        false,
+    )
+    .await?;
+
+    Ok(())
+}