Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 877 insertions, 0 deletions

diff --git a/vendor/expect-test/src/lib.rs b/vendor/expect-test/src/lib.rs
new file mode 100644
index 000000000..83fcf35bf
--- /dev/null
+++ b/vendor/expect-test/src/lib.rs
@@ -0,0 +1,877 @@
+//! Minimalistic snapshot testing for Rust.
+//!
+//! # Introduction
+//!
+//! `expect_test` is a small addition over plain `assert_eq!` testing approach,
+//! which allows to automatically update tests results.
+//!
+//! The core of the library is the `expect!` macro. It can be though of as a
+//! super-charged string literal, which can update itself.
+//!
+//! Let's see an example:
+//!
+//! ```no_run
+//! use expect_test::expect;
+//!
+//! let actual = 2 + 2;
+//! let expected = expect!["5"]; // or expect![["5"]]
+//! expected.assert_eq(&actual.to_string())
+//! ```
+//!
+//! Running this code will produce a test failure, as `"5"` is indeed not equal
+//! to `"4"`. Running the test with `UPDATE_EXPECT=1` env variable however would
+//! "magically" update the code to:
+//!
+//! ```no_run
+//! # use expect_test::expect;
+//! let actual = 2 + 2;
+//! let expected = expect!["4"];
+//! expected.assert_eq(&actual.to_string())
+//! ```
+//!
+//! This becomes very useful when you have a lot of tests with verbose and
+//! potentially changing expected output.
+//!
+//! Under the hood, the `expect!` macro uses `file!`, `line!` and `column!` to
+//! record source position at compile time. At runtime, this position is used
+//! to patch the file in-place, if `UPDATE_EXPECT` is set.
+//!
+//! # Guide
+//!
+//! `expect!` returns an instance of `Expect` struct, which holds position
+//! information and a string literal. Use `Expect::assert_eq` for string
+//! comparison. Use `Expect::assert_debug_eq` for verbose debug comparison. Note
+//! that leading indentation is automatically removed.
+//!
+//! ```
+//! use expect_test::expect;
+//!
+//! #[derive(Debug)]
+//! struct Foo {
+//!     value: i32,
+//! }
+//!
+//! let actual = Foo { value: 92 };
+//! let expected = expect![["
+//!     Foo {
+//!         value: 92,
+//!     }
+//! "]];
+//! expected.assert_debug_eq(&actual);
+//! ```
+//!
+//! Be careful with `assert_debug_eq` - in general, stability of the debug
+//! representation is not guaranteed. However, even if it changes, you can
+//! quickly update all the tests by running the test suite with `UPDATE_EXPECT`
+//! environmental variable set.
+//!
+//! If the expected data is too verbose to include inline, you can store it in
+//! an external file using the `expect_file!` macro:
+//!
+//! ```no_run
+//! use expect_test::expect_file;
+//!
+//! let actual = 42;
+//! let expected = expect_file!["./the-answer.txt"];
+//! expected.assert_eq(&actual.to_string());
+//! ```
+//!
+//! File path is relative to the current file.
+//!
+//! # Suggested Workflows
+//!
+//! I like to use data-driven tests with `expect_test`. I usually define a
+//! single driver function `check` and then call it from individual tests:
+//!
+//! ```
+//! use expect_test::{expect, Expect};
+//!
+//! fn check(actual: i32, expect: Expect) {
+//!     let actual = actual.to_string();
+//!     expect.assert_eq(&actual);
+//! }
+//!
+//! #[test]
+//! fn test_addition() {
+//!     check(90 + 2, expect![["92"]]);
+//! }
+//!
+//! #[test]
+//! fn test_multiplication() {
+//!     check(46 * 2, expect![["92"]]);
+//! }
+//! ```
+//!
+//! Each test's body is a single call to `check`. All the variation in tests
+//! comes from the input data.
+//!
+//! When writing a new test, I usually copy-paste an old one, leave the `expect`
+//! blank and use `UPDATE_EXPECT` to fill the value for me:
+//!
+//! ```
+//! # use expect_test::{expect, Expect};
+//! # fn check(_: i32, _: Expect) {}
+//! #[test]
+//! fn test_division() {
+//!     check(92 / 2, expect![[]])
+//! }
+//! ```
+//!
+//! See
+//! https://blog.janestreet.com/using-ascii-waveforms-to-test-hardware-designs/
+//! for a cool example of snapshot testing in the wild!
+//!
+//! # Alternatives
+//!
+//! * [insta](https://crates.io/crates/insta) - a more feature full snapshot
+//!   testing library.
+//! * [k9](https://crates.io/crates/k9) - a testing library which includes
+//!   support for snapshot testing among other things.
+//!
+//! # Maintenance status
+//!
+//! The main customer of this library is rust-analyzer. The library is  stable,
+//! it is planned to not release any major versions past 1.0.
+//!
+//! ## Minimal Supported Rust Version
+//!
+//! This crate's minimum supported `rustc` version is `1.45.0`. MSRV is updated
+//! conservatively, supporting roughly 10 minor versions of `rustc`. MSRV bump
+//! is not considered semver breaking, but will require at least minor version
+//! bump.
+use std::{
+    collections::HashMap,
+    convert::TryInto,
+    env, fmt, fs, mem,
+    ops::Range,
+    panic,
+    path::{Path, PathBuf},
+    sync::Mutex,
+};
+
+use once_cell::sync::{Lazy, OnceCell};
+
+const HELP: &str = "
+You can update all `expect!` tests by running:
+
+    env UPDATE_EXPECT=1 cargo test
+
+To update a single test, place the cursor on `expect` token and use `run` feature of rust-analyzer.
+";
+
+fn update_expect() -> bool {
+    env::var("UPDATE_EXPECT").is_ok()
+}
+
+/// Creates an instance of `Expect` from string literal:
+///
+/// ```
+/// # use expect_test::expect;
+/// expect![["
+///     Foo { value: 92 }
+/// "]];
+/// expect![r#"{"Foo": 92}"#];
+/// ```
+///
+/// Leading indentation is stripped.
+#[macro_export]
+macro_rules! expect {
+    [$data:literal] => { $crate::expect![[$data]] };
+    [[$data:literal]] => {$crate::Expect {
+        position: $crate::Position {
+            file: file!(),
+            line: line!(),
+            column: column!(),
+        },
+        data: $data,
+        indent: true,
+    }};
+    [] => { $crate::expect![[""]] };
+    [[]] => { $crate::expect![[""]] };
+}
+
+/// Creates an instance of `ExpectFile` from relative or absolute path:
+///
+/// ```
+/// # use expect_test::expect_file;
+/// expect_file!["./test_data/bar.html"];
+/// ```
+#[macro_export]
+macro_rules! expect_file {
+    [$path:expr] => {$crate::ExpectFile {
+        path: std::path::PathBuf::from($path),
+        position: file!(),
+    }};
+}
+
+/// Self-updating string literal.
+#[derive(Debug)]
+pub struct Expect {
+    #[doc(hidden)]
+    pub position: Position,
+    #[doc(hidden)]
+    pub data: &'static str,
+    #[doc(hidden)]
+    pub indent: bool,
+}
+
+/// Self-updating file.
+#[derive(Debug)]
+pub struct ExpectFile {
+    #[doc(hidden)]
+    pub path: PathBuf,
+    #[doc(hidden)]
+    pub position: &'static str,
+}
+
+/// Position of original `expect!` in the source file.
+#[derive(Debug)]
+pub struct Position {
+    #[doc(hidden)]
+    pub file: &'static str,
+    #[doc(hidden)]
+    pub line: u32,
+    #[doc(hidden)]
+    pub column: u32,
+}
+
+impl fmt::Display for Position {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}:{}:{}", self.file, self.line, self.column)
+    }
+}
+
+#[derive(Clone, Copy)]
+enum StrLitKind {
+    Normal,
+    Raw(usize),
+}
+
+impl StrLitKind {
+    fn write_start(self, w: &mut impl std::fmt::Write) -> std::fmt::Result {
+        match self {
+            Self::Normal => write!(w, "\""),
+            Self::Raw(n) => {
+                write!(w, "r")?;
+                for _ in 0..n {
+                    write!(w, "#")?;
+                }
+                write!(w, "\"")
+            }
+        }
+    }
+
+    fn write_end(self, w: &mut impl std::fmt::Write) -> std::fmt::Result {
+        match self {
+            Self::Normal => write!(w, "\""),
+            Self::Raw(n) => {
+                write!(w, "\"")?;
+                for _ in 0..n {
+                    write!(w, "#")?;
+                }
+                Ok(())
+            }
+        }
+    }
+}
+
+impl Expect {
+    /// Checks if this expect is equal to `actual`.
+    pub fn assert_eq(&self, actual: &str) {
+        let trimmed = self.trimmed();
+        if trimmed == actual {
+            return;
+        }
+        Runtime::fail_expect(self, &trimmed, actual);
+    }
+    /// Checks if this expect is equal to `format!("{:#?}", actual)`.
+    pub fn assert_debug_eq(&self, actual: &impl fmt::Debug) {
+        let actual = format!("{:#?}\n", actual);
+        self.assert_eq(&actual)
+    }
+    /// If `true` (default), in-place update will indent the string literal.
+    pub fn indent(&mut self, yes: bool) {
+        self.indent = yes;
+    }
+
+    /// Returns the content of this expect.
+    pub fn data(&self) -> &str {
+        self.data
+    }
+
+    fn trimmed(&self) -> String {
+        if !self.data.contains('\n') {
+            return self.data.to_string();
+        }
+        trim_indent(self.data)
+    }
+
+    fn locate(&self, file: &str) -> Location {
+        let mut target_line = None;
+        let mut line_start = 0;
+        for (i, line) in lines_with_ends(file).enumerate() {
+            if i == self.position.line as usize - 1 {
+                // `column` points to the first character of the macro invocation:
+                //
+                //    expect![[r#""#]]        expect![""]
+                //    ^       ^               ^       ^
+                //  column   offset                 offset
+                //
+                // Seek past the exclam, then skip any whitespace and
+                // the macro delimiter to get to our argument.
+                let byte_offset = line
+                    .char_indices()
+                    .skip((self.position.column - 1).try_into().unwrap())
+                    .skip_while(|&(_, c)| c != '!')
+                    .skip(1) // !
+                    .skip_while(|&(_, c)| c.is_whitespace())
+                    .skip(1) // [({
+                    .skip_while(|&(_, c)| c.is_whitespace())
+                    .next()
+                    .expect("Failed to parse macro invocation")
+                    .0;
+
+                let literal_start = line_start + byte_offset;
+                let indent = line.chars().take_while(|&it| it == ' ').count();
+                target_line = Some((literal_start, indent));
+                break;
+            }
+            line_start += line.len();
+        }
+        let (literal_start, line_indent) = target_line.unwrap();
+
+        let lit_to_eof = &file[literal_start..];
+        let lit_to_eof_trimmed = lit_to_eof.trim_start();
+
+        let literal_start = literal_start + (lit_to_eof.len() - lit_to_eof_trimmed.len());
+
+        let literal_len =
+            locate_end(lit_to_eof_trimmed).expect("Couldn't find closing delimiter for `expect!`.");
+        let literal_range = literal_start..literal_start + literal_len;
+        Location { line_indent, literal_range }
+    }
+}
+
+fn locate_end(arg_start_to_eof: &str) -> Option<usize> {
+    match arg_start_to_eof.chars().next()? {
+        c if c.is_whitespace() => panic!("skip whitespace before calling `locate_end`"),
+
+        // expect![[]]
+        '[' => {
+            let str_start_to_eof = arg_start_to_eof[1..].trim_start();
+            let str_len = find_str_lit_len(str_start_to_eof)?;
+            let str_end_to_eof = &str_start_to_eof[str_len..];
+            let closing_brace_offset = str_end_to_eof.find(']')?;
+            Some((arg_start_to_eof.len() - str_end_to_eof.len()) + closing_brace_offset + 1)
+        }
+
+        // expect![] | expect!{} | expect!()
+        ']' | '}' | ')' => Some(0),
+
+        // expect!["..."] | expect![r#"..."#]
+        _ => find_str_lit_len(arg_start_to_eof),
+    }
+}
+
+/// Parses a string literal, returning the byte index of its last character
+/// (either a quote or a hash).
+fn find_str_lit_len(str_lit_to_eof: &str) -> Option<usize> {
+    use StrLitKind::*;
+
+    fn try_find_n_hashes(
+        s: &mut impl Iterator<Item = char>,
+        desired_hashes: usize,
+    ) -> Option<(usize, Option<char>)> {
+        let mut n = 0;
+        loop {
+            match s.next()? {
+                '#' => n += 1,
+                c => return Some((n, Some(c))),
+            }
+
+            if n == desired_hashes {
+                return Some((n, None));
+            }
+        }
+    }
+
+    let mut s = str_lit_to_eof.chars();
+    let kind = match s.next()? {
+        '"' => Normal,
+        'r' => {
+            let (n, c) = try_find_n_hashes(&mut s, usize::MAX)?;
+            if c != Some('"') {
+                return None;
+            }
+            Raw(n)
+        }
+        _ => return None,
+    };
+
+    let mut oldc = None;
+    loop {
+        let c = oldc.take().or_else(|| s.next())?;
+        match (c, kind) {
+            ('\\', Normal) => {
+                let _escaped = s.next()?;
+            }
+            ('"', Normal) => break,
+            ('"', Raw(0)) => break,
+            ('"', Raw(n)) => {
+                let (seen, c) = try_find_n_hashes(&mut s, n)?;
+                if seen == n {
+                    break;
+                }
+                oldc = c;
+            }
+            _ => {}
+        }
+    }
+
+    Some(str_lit_to_eof.len() - s.as_str().len())
+}
+
+impl ExpectFile {
+    /// Checks if file contents is equal to `actual`.
+    pub fn assert_eq(&self, actual: &str) {
+        let expected = self.read();
+        if actual == expected {
+            return;
+        }
+        Runtime::fail_file(self, &expected, actual);
+    }
+    /// Checks if file contents is equal to `format!("{:#?}", actual)`.
+    pub fn assert_debug_eq(&self, actual: &impl fmt::Debug) {
+        let actual = format!("{:#?}\n", actual);
+        self.assert_eq(&actual)
+    }
+    fn read(&self) -> String {
+        fs::read_to_string(self.abs_path()).unwrap_or_default().replace("\r\n", "\n")
+    }
+    fn write(&self, contents: &str) {
+        fs::write(self.abs_path(), contents).unwrap()
+    }
+    fn abs_path(&self) -> PathBuf {
+        if self.path.is_absolute() {
+            self.path.to_owned()
+        } else {
+            let dir = Path::new(self.position).parent().unwrap();
+            to_abs_ws_path(&dir.join(&self.path))
+        }
+    }
+}
+
+#[derive(Default)]
+struct Runtime {
+    help_printed: bool,
+    per_file: HashMap<&'static str, FileRuntime>,
+}
+static RT: Lazy<Mutex<Runtime>> = Lazy::new(Default::default);
+
+impl Runtime {
+    fn fail_expect(expect: &Expect, expected: &str, actual: &str) {
+        let mut rt = RT.lock().unwrap_or_else(|poisoned| poisoned.into_inner());
+        if update_expect() {
+            println!("\x1b[1m\x1b[92mupdating\x1b[0m: {}", expect.position);
+            rt.per_file
+                .entry(expect.position.file)
+                .or_insert_with(|| FileRuntime::new(expect))
+                .update(expect, actual);
+            return;
+        }
+        rt.panic(expect.position.to_string(), expected, actual);
+    }
+    fn fail_file(expect: &ExpectFile, expected: &str, actual: &str) {
+        let mut rt = RT.lock().unwrap_or_else(|poisoned| poisoned.into_inner());
+        if update_expect() {
+            println!("\x1b[1m\x1b[92mupdating\x1b[0m: {}", expect.path.display());
+            expect.write(actual);
+            return;
+        }
+        rt.panic(expect.path.display().to_string(), expected, actual);
+    }
+    fn panic(&mut self, position: String, expected: &str, actual: &str) {
+        let print_help = !mem::replace(&mut self.help_printed, true);
+        let help = if print_help { HELP } else { "" };
+
+        let diff = dissimilar::diff(expected, actual);
+
+        println!(
+            "\n
+\x1b[1m\x1b[91merror\x1b[97m: expect test failed\x1b[0m
+   \x1b[1m\x1b[34m-->\x1b[0m {}
+{}
+\x1b[1mExpect\x1b[0m:
+----
+{}
+----
+
+\x1b[1mActual\x1b[0m:
+----
+{}
+----
+
+\x1b[1mDiff\x1b[0m:
+----
+{}
+----
+",
+            position,
+            help,
+            expected,
+            actual,
+            format_chunks(diff)
+        );
+        // Use resume_unwind instead of panic!() to prevent a backtrace, which is unnecessary noise.
+        panic::resume_unwind(Box::new(()));
+    }
+}
+
+struct FileRuntime {
+    path: PathBuf,
+    original_text: String,
+    patchwork: Patchwork,
+}
+
+impl FileRuntime {
+    fn new(expect: &Expect) -> FileRuntime {
+        let path = to_abs_ws_path(Path::new(expect.position.file));
+        let original_text = fs::read_to_string(&path).unwrap();
+        let patchwork = Patchwork::new(original_text.clone());
+        FileRuntime { path, original_text, patchwork }
+    }
+    fn update(&mut self, expect: &Expect, actual: &str) {
+        let loc = expect.locate(&self.original_text);
+        let desired_indent = if expect.indent { Some(loc.line_indent) } else { None };
+        let patch = format_patch(desired_indent, actual);
+        self.patchwork.patch(loc.literal_range, &patch);
+        fs::write(&self.path, &self.patchwork.text).unwrap()
+    }
+}
+
+#[derive(Debug)]
+struct Location {
+    line_indent: usize,
+
+    /// The byte range of the argument to `expect!`, including the inner `[]` if it exists.
+    literal_range: Range<usize>,
+}
+
+#[derive(Debug)]
+struct Patchwork {
+    text: String,
+    indels: Vec<(Range<usize>, usize)>,
+}
+
+impl Patchwork {
+    fn new(text: String) -> Patchwork {
+        Patchwork { text, indels: Vec::new() }
+    }
+    fn patch(&mut self, mut range: Range<usize>, patch: &str) {
+        self.indels.push((range.clone(), patch.len()));
+        self.indels.sort_by_key(|(delete, _insert)| delete.start);
+
+        let (delete, insert) = self
+            .indels
+            .iter()
+            .take_while(|(delete, _)| delete.start < range.start)
+            .map(|(delete, insert)| (delete.end - delete.start, insert))
+            .fold((0usize, 0usize), |(x1, y1), (x2, y2)| (x1 + x2, y1 + y2));
+
+        for pos in &mut [&mut range.start, &mut range.end] {
+            **pos -= delete;
+            **pos += insert;
+        }
+
+        self.text.replace_range(range, &patch);
+    }
+}
+
+fn lit_kind_for_patch(patch: &str) -> StrLitKind {
+    let has_dquote = patch.chars().any(|c| c == '"');
+    if !has_dquote {
+        let has_bslash_or_newline = patch.chars().any(|c| matches!(c, '\\' | '\n'));
+        return if has_bslash_or_newline { StrLitKind::Raw(1) } else { StrLitKind::Normal };
+    }
+
+    // Find the maximum number of hashes that follow a double quote in the string.
+    // We need to use one more than that to delimit the string.
+    let leading_hashes = |s: &str| s.chars().take_while(|&c| c == '#').count();
+    let max_hashes = patch.split('"').map(leading_hashes).max().unwrap();
+    StrLitKind::Raw(max_hashes + 1)
+}
+
+fn format_patch(desired_indent: Option<usize>, patch: &str) -> String {
+    let lit_kind = lit_kind_for_patch(patch);
+    let indent = desired_indent.map(|it| " ".repeat(it));
+    let is_multiline = patch.contains('\n');
+
+    let mut buf = String::new();
+    if matches!(lit_kind, StrLitKind::Raw(_)) {
+        buf.push('[');
+    }
+    lit_kind.write_start(&mut buf).unwrap();
+    if is_multiline {
+        buf.push('\n');
+    }
+    let mut final_newline = false;
+    for line in lines_with_ends(patch) {
+        if is_multiline && !line.trim().is_empty() {
+            if let Some(indent) = &indent {
+                buf.push_str(indent);
+                buf.push_str("    ");
+            }
+        }
+        buf.push_str(line);
+        final_newline = line.ends_with('\n');
+    }
+    if final_newline {
+        if let Some(indent) = &indent {
+            buf.push_str(indent);
+        }
+    }
+    lit_kind.write_end(&mut buf).unwrap();
+    if matches!(lit_kind, StrLitKind::Raw(_)) {
+        buf.push(']');
+    }
+    buf
+}
+
+fn to_abs_ws_path(path: &Path) -> PathBuf {
+    if path.is_absolute() {
+        return path.to_owned();
+    }
+
+    static WORKSPACE_ROOT: OnceCell<PathBuf> = OnceCell::new();
+    WORKSPACE_ROOT
+        .get_or_try_init(|| {
+            // Until https://github.com/rust-lang/cargo/issues/3946 is resolved, this
+            // is set with a hack like https://github.com/rust-lang/cargo/issues/3946#issuecomment-973132993
+            if let Ok(workspace_root) = env::var("CARGO_WORKSPACE_DIR") {
+                return Ok(workspace_root.into());
+            }
+
+            // If a hack isn't used, we use a heuristic to find the "top-level" workspace.
+            // This fails in some cases, see https://github.com/rust-analyzer/expect-test/issues/33
+            let my_manifest = env::var("CARGO_MANIFEST_DIR")?;
+            let workspace_root = Path::new(&my_manifest)
+                .ancestors()
+                .filter(|it| it.join("Cargo.toml").exists())
+                .last()
+                .unwrap()
+                .to_path_buf();
+
+            Ok(workspace_root)
+        })
+        .unwrap_or_else(|_: env::VarError| {
+            panic!("No CARGO_MANIFEST_DIR env var and the path is relative: {}", path.display())
+        })
+        .join(path)
+}
+
+fn trim_indent(mut text: &str) -> String {
+    if text.starts_with('\n') {
+        text = &text[1..];
+    }
+    let indent = text
+        .lines()
+        .filter(|it| !it.trim().is_empty())
+        .map(|it| it.len() - it.trim_start().len())
+        .min()
+        .unwrap_or(0);
+
+    lines_with_ends(text)
+        .map(
+            |line| {
+                if line.len() <= indent {
+                    line.trim_start_matches(' ')
+                } else {
+                    &line[indent..]
+                }
+            },
+        )
+        .collect()
+}
+
+fn lines_with_ends(text: &str) -> LinesWithEnds {
+    LinesWithEnds { text }
+}
+
+struct LinesWithEnds<'a> {
+    text: &'a str,
+}
+
+impl<'a> Iterator for LinesWithEnds<'a> {
+    type Item = &'a str;
+    fn next(&mut self) -> Option<&'a str> {
+        if self.text.is_empty() {
+            return None;
+        }
+        let idx = self.text.find('\n').map_or(self.text.len(), |it| it + 1);
+        let (res, next) = self.text.split_at(idx);
+        self.text = next;
+        Some(res)
+    }
+}
+
+fn format_chunks(chunks: Vec<dissimilar::Chunk>) -> String {
+    let mut buf = String::new();
+    for chunk in chunks {
+        let formatted = match chunk {
+            dissimilar::Chunk::Equal(text) => text.into(),
+            dissimilar::Chunk::Delete(text) => format!("\x1b[41m{}\x1b[0m", text),
+            dissimilar::Chunk::Insert(text) => format!("\x1b[42m{}\x1b[0m", text),
+        };
+        buf.push_str(&formatted);
+    }
+    buf
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_trivial_assert() {
+        expect!["5"].assert_eq("5");
+    }
+
+    #[test]
+    fn test_format_patch() {
+        let patch = format_patch(None, "hello\nworld\n");
+        expect![[r##"
+            [r#"
+            hello
+            world
+            "#]"##]]
+        .assert_eq(&patch);
+
+        let patch = format_patch(None, r"hello\tworld");
+        expect![[r##"[r#"hello\tworld"#]"##]].assert_eq(&patch);
+
+        let patch = format_patch(None, "{\"foo\": 42}");
+        expect![[r##"[r#"{"foo": 42}"#]"##]].assert_eq(&patch);
+
+        let patch = format_patch(Some(0), "hello\nworld\n");
+        expect![[r##"
+            [r#"
+                hello
+                world
+            "#]"##]]
+        .assert_eq(&patch);
+
+        let patch = format_patch(Some(4), "single line");
+        expect![[r#""single line""#]].assert_eq(&patch);
+    }
+
+    #[test]
+    fn test_patchwork() {
+        let mut patchwork = Patchwork::new("one two three".to_string());
+        patchwork.patch(4..7, "zwei");
+        patchwork.patch(0..3, "один");
+        patchwork.patch(8..13, "3");
+        expect![[r#"
+            Patchwork {
+                text: "один zwei 3",
+                indels: [
+                    (
+                        0..3,
+                        8,
+                    ),
+                    (
+                        4..7,
+                        4,
+                    ),
+                    (
+                        8..13,
+                        1,
+                    ),
+                ],
+            }
+        "#]]
+        .assert_debug_eq(&patchwork);
+    }
+
+    #[test]
+    fn test_expect_file() {
+        expect_file!["./lib.rs"].assert_eq(include_str!("./lib.rs"))
+    }
+
+    #[test]
+    fn smoke_test_indent() {
+        fn check_indented(input: &str, mut expect: Expect) {
+            expect.indent(true);
+            expect.assert_eq(input);
+        }
+        fn check_not_indented(input: &str, mut expect: Expect) {
+            expect.indent(false);
+            expect.assert_eq(input);
+        }
+
+        check_indented(
+            "\
+line1
+  line2
+",
+            expect![[r#"
+                line1
+                  line2
+            "#]],
+        );
+
+        check_not_indented(
+            "\
+line1
+  line2
+",
+            expect![[r#"
+line1
+  line2
+"#]],
+        );
+    }
+
+    #[test]
+    fn test_locate() {
+        macro_rules! check_locate {
+            ($( [[$s:literal]] ),* $(,)?) => {$({
+                let lit = stringify!($s);
+                let with_trailer = format!("{} \t]]\n", lit);
+                assert_eq!(locate_end(&with_trailer), Some(lit.len()));
+            })*};
+        }
+
+        // Check that we handle string literals containing "]]" correctly.
+        check_locate!(
+            [[r#"{ arr: [[1, 2], [3, 4]], other: "foo" } "#]],
+            [["]]"]],
+            [["\"]]"]],
+            [[r#""]]"#]],
+        );
+
+        // Check `expect![[  ]]` as well.
+        assert_eq!(locate_end("]]"), Some(0));
+    }
+
+    #[test]
+    fn test_find_str_lit_len() {
+        macro_rules! check_str_lit_len {
+            ($( $s:literal ),* $(,)?) => {$({
+                let lit = stringify!($s);
+                assert_eq!(find_str_lit_len(lit), Some(lit.len()));
+            })*}
+        }
+
+        check_str_lit_len![
+            r##"foa\""#"##,
+            r##"
+
+                asdf][]]""""#
+            "##,
+            "",
+            "\"",
+            "\"\"",
+            "#\"#\"#",
+        ];
+    }
+}