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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 3
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[[package]]
name = "pretty_assertions"
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dependencies = [
"diff",
"yansi",
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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2018"
name = "pretty_assertions"
version = "1.4.0"
authors = [
"Colin Kiegel <kiegel@gmx.de>",
"Florent Fayolle <florent.fayolle69@gmail.com>",
"Tom Milligan <code@tommilligan.net>",
]
description = "Overwrite `assert_eq!` and `assert_ne!` with drop-in replacements, adding colorful diffs."
documentation = "https://docs.rs/pretty_assertions"
readme = "README.md"
keywords = [
"assert",
"diff",
"pretty",
"color",
]
categories = ["development-tools"]
license = "MIT OR Apache-2.0"
repository = "https://github.com/rust-pretty-assertions/rust-pretty-assertions"
[dependencies.diff]
version = "0.1.12"
[dependencies.yansi]
version = "0.5"
[features]
alloc = []
default = ["std"]
std = []
unstable = []

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# Pretty Assertions
[![Latest version](https://img.shields.io/crates/v/pretty-assertions.svg)](https://crates.io/crates/pretty-assertions)
[![docs.rs](https://img.shields.io/docsrs/pretty_assertions)](https://docs.rs/pretty_assertions)
[![Downloads of latest version](https://img.shields.io/crates/dv/pretty-assertions.svg)](https://crates.io/crates/pretty-assertions)
[![All downloads](https://img.shields.io/crates/d/pretty-assertions.svg)](https://crates.io/crates/pretty-assertions)
Overwrite `assert_eq!` with a drop-in replacement, adding a colorful diff.
## Usage
When writing tests in Rust, you'll probably use `assert_eq!(a, b)` _a lot_.
If such a test fails, it will present all the details of `a` and `b`.
But you have to spot the differences yourself, which is not always straightforward,
like here:
![standard assertion](https://raw.githubusercontent.com/rust-pretty-assertions/rust-pretty-assertions/2d2357ff56d22c51a86b2f1cfe6efcee9f5a8081/examples/standard_assertion.png)
Wouldn't that task be _much_ easier with a colorful diff?
![pretty assertion](https://raw.githubusercontent.com/rust-pretty-assertions/rust-pretty-assertions/2d2357ff56d22c51a86b2f1cfe6efcee9f5a8081/examples/pretty_assertion.png)
Yep — and you only need **one line of code** to make it happen:
```rust,ignore
use pretty_assertions::{assert_eq, assert_ne};
```
<details>
<summary>Show the example behind the screenshots above.</summary>
```rust,ignore
// 1. add the `pretty_assertions` dependency to `Cargo.toml`.
// 2. insert this line at the top of each module, as needed
use pretty_assertions::{assert_eq, assert_ne};
fn main() {
#[derive(Debug, PartialEq)]
struct Foo {
lorem: &'static str,
ipsum: u32,
dolor: Result<String, String>,
}
let x = Some(Foo { lorem: "Hello World!", ipsum: 42, dolor: Ok("hey".to_string())});
let y = Some(Foo { lorem: "Hello Wrold!", ipsum: 42, dolor: Ok("hey ho!".to_string())});
assert_eq!(x, y);
}
```
</details>
## Semantic Versioning
The exact output of assertions is **not guaranteed** to be consistent over time, and may change between minor versions.
The output of this crate is designed to be read by a human. It is not suitable for exact comparison, for example in snapshot testing.
This crate adheres to semantic versioning for publically exported crate items, **except** the `private` module, which may change between any version.
## Tip
Specify it as [`[dev-dependencies]`](http://doc.crates.io/specifying-dependencies.html#development-dependencies)
and it will only be used for compiling tests, examples, and benchmarks.
This way the compile time of `cargo build` won't be affected!
Also add `#[cfg(test)]` to your `use` statements, like this:
```rust,ignore
#[cfg(test)]
use pretty_assertions::{assert_eq, assert_ne};
```
## Notes
- Since `Rust 2018` edition, you need to declare
`use pretty_assertions::{assert_eq, assert_ne};` per module.
Before you would write `#[macro_use] extern crate pretty_assertions;`.
- The replacement is only effective in your own crate, not in other libraries
you include.
- `assert_ne` is also switched to multi-line presentation, but does _not_ show
a diff.
- Under Windows, the terminal state is modified to properly handle VT100
escape sequences, which may break display for certain use cases.
- The minimum supported rust version (MSRV) is 1.35.0
### `no_std` support
For `no_std` support, disable the `std` feature and enable the `alloc` feature:
```toml
# Cargo.toml
pretty_assertions = { version= "...", default-features = false, features = ["alloc"] }
```
## License
Licensed under either of
- Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or <http://www.apache.org/licenses/LICENSE-2.0>)
- MIT license ([LICENSE-MIT](LICENSE-MIT) or <http://opensource.org/licenses/MIT>)
at your option.
### Contribution
Unless you explicitly state otherwise, any contribution intentionally
submitted for inclusion in the work by you, as defined in the Apache-2.0
license, shall be dual licensed as above, without any additional terms or
conditions.
## Development
- Cut a new release by creating a GitHub release with tag. Crate will be built and uploaded to crates.io by GHA.

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use pretty_assertions::assert_eq;
include!("standard_assertion.rs");

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#[derive(Debug, PartialEq)]
struct Foo {
lorem: &'static str,
ipsum: u32,
dolor: Result<String, String>,
}
fn compare() {
let x = Some(Foo {
lorem: "Hello World!",
ipsum: 42,
dolor: Ok("hey".to_string()),
});
let y = Some(Foo {
lorem: "Hello Wrold!",
ipsum: 42,
dolor: Ok("hey ho!".to_string()),
});
assert_eq!(x, y);
}
fn main() {
let result = std::panic::catch_unwind(compare);
assert!(result.is_err(), "example did not panic");
}

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//! # Pretty Assertions
//!
//! When writing tests in Rust, you'll probably use `assert_eq!(a, b)` _a lot_.
//!
//! If such a test fails, it will present all the details of `a` and `b`.
//! But you have to spot the differences yourself, which is not always straightforward,
//! like here:
//!
//! ![standard assertion](https://raw.githubusercontent.com/rust-pretty-assertions/rust-pretty-assertions/2d2357ff56d22c51a86b2f1cfe6efcee9f5a8081/examples/standard_assertion.png)
//!
//! Wouldn't that task be _much_ easier with a colorful diff?
//!
//! ![pretty assertion](https://raw.githubusercontent.com/rust-pretty-assertions/rust-pretty-assertions/2d2357ff56d22c51a86b2f1cfe6efcee9f5a8081/examples/pretty_assertion.png)
//!
//! Yep — and you only need **one line of code** to make it happen:
//!
//! ```rust
//! use pretty_assertions::{assert_eq, assert_ne};
//! ```
//!
//! <details>
//! <summary>Show the example behind the screenshots above.</summary>
//!
//! ```rust,should_panic
//! // 1. add the `pretty_assertions` dependency to `Cargo.toml`.
//! // 2. insert this line at the top of each module, as needed
//! use pretty_assertions::{assert_eq, assert_ne};
//!
//! #[derive(Debug, PartialEq)]
//! struct Foo {
//! lorem: &'static str,
//! ipsum: u32,
//! dolor: Result<String, String>,
//! }
//!
//! let x = Some(Foo { lorem: "Hello World!", ipsum: 42, dolor: Ok("hey".to_string())});
//! let y = Some(Foo { lorem: "Hello Wrold!", ipsum: 42, dolor: Ok("hey ho!".to_string())});
//!
//! assert_eq!(x, y);
//! ```
//! </details>
//!
//! ## Tip
//!
//! Specify it as [`[dev-dependencies]`](http://doc.crates.io/specifying-dependencies.html#development-dependencies)
//! and it will only be used for compiling tests, examples, and benchmarks.
//! This way the compile time of `cargo build` won't be affected!
//!
//! Also add `#[cfg(test)]` to your `use` statements, like this:
//!
//! ```rust
//! #[cfg(test)]
//! use pretty_assertions::{assert_eq, assert_ne};
//! ```
//!
//! ## Note
//!
//! * Since `Rust 2018` edition, you need to declare
//! `use pretty_assertions::{assert_eq, assert_ne};` per module.
//! Before you would write `#[macro_use] extern crate pretty_assertions;`.
//! * The replacement is only effective in your own crate, not in other libraries
//! you include.
//! * `assert_ne` is also switched to multi-line presentation, but does _not_ show
//! a diff.
//!
//! ## Features
//!
//! Features provided by the crate are:
//!
//! - `std`: Use the Rust standard library. Enabled by default.
//! Exactly one of `std` and `alloc` is required.
//! - `alloc`: Use the `alloc` crate.
//! Exactly one of `std` and `alloc` is required.
//! - `unstable`: opt-in to unstable features that may not follow Semantic Versioning.
//! The implementation behind this feature is subject to change without warning between patch versions.
#![cfg_attr(not(feature = "std"), no_std)]
#![deny(clippy::all, missing_docs, unsafe_code)]
#[cfg(feature = "alloc")]
#[macro_use]
extern crate alloc;
use core::fmt::{self, Debug, Display};
mod printer;
/// A comparison of two values.
///
/// Where both values implement `Debug`, the comparison can be displayed as a pretty diff.
///
/// ```
/// use pretty_assertions::Comparison;
///
/// print!("{}", Comparison::new(&123, &134));
/// ```
///
/// The values may have different types, although in practice they are usually the same.
pub struct Comparison<'a, TLeft, TRight>
where
TLeft: ?Sized,
TRight: ?Sized,
{
left: &'a TLeft,
right: &'a TRight,
}
impl<'a, TLeft, TRight> Comparison<'a, TLeft, TRight>
where
TLeft: ?Sized,
TRight: ?Sized,
{
/// Store two values to be compared in future.
///
/// Expensive diffing is deferred until calling `Debug::fmt`.
pub fn new(left: &'a TLeft, right: &'a TRight) -> Comparison<'a, TLeft, TRight> {
Comparison { left, right }
}
}
impl<'a, TLeft, TRight> Display for Comparison<'a, TLeft, TRight>
where
TLeft: Debug + ?Sized,
TRight: Debug + ?Sized,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
// To diff arbitary types, render them as debug strings
let left_debug = format!("{:#?}", self.left);
let right_debug = format!("{:#?}", self.right);
// And then diff the debug output
printer::write_header(f)?;
printer::write_lines(f, &left_debug, &right_debug)
}
}
/// A comparison of two strings.
///
/// In contrast to [`Comparison`], which uses the [`core::fmt::Debug`] representation,
/// `StrComparison` uses the string values directly, resulting in multi-line output for multiline strings.
///
/// ```
/// use pretty_assertions::StrComparison;
///
/// print!("{}", StrComparison::new("foo\nbar", "foo\nbaz"));
/// ```
///
/// ## Value type bounds
///
/// Any value that can be referenced as a [`str`] via [`AsRef`] may be used:
///
/// ```
/// use pretty_assertions::StrComparison;
///
/// #[derive(PartialEq)]
/// struct MyString(String);
///
/// impl AsRef<str> for MyString {
/// fn as_ref(&self) -> &str {
/// &self.0
/// }
/// }
///
/// print!(
/// "{}",
/// StrComparison::new(
/// &MyString("foo\nbar".to_owned()),
/// &MyString("foo\nbaz".to_owned()),
/// ),
/// );
/// ```
///
/// The values may have different types, although in practice they are usually the same.
pub struct StrComparison<'a, TLeft, TRight>
where
TLeft: ?Sized,
TRight: ?Sized,
{
left: &'a TLeft,
right: &'a TRight,
}
impl<'a, TLeft, TRight> StrComparison<'a, TLeft, TRight>
where
TLeft: AsRef<str> + ?Sized,
TRight: AsRef<str> + ?Sized,
{
/// Store two values to be compared in future.
///
/// Expensive diffing is deferred until calling `Debug::fmt`.
pub fn new(left: &'a TLeft, right: &'a TRight) -> StrComparison<'a, TLeft, TRight> {
StrComparison { left, right }
}
}
impl<'a, TLeft, TRight> Display for StrComparison<'a, TLeft, TRight>
where
TLeft: AsRef<str> + ?Sized,
TRight: AsRef<str> + ?Sized,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
printer::write_header(f)?;
printer::write_lines(f, self.left.as_ref(), self.right.as_ref())
}
}
/// Asserts that two expressions are equal to each other (using [`PartialEq`]).
///
/// On panic, this macro will print a diff derived from [`Debug`] representation of
/// each value.
///
/// This is a drop in replacement for [`core::assert_eq!`].
/// You can provide a custom panic message if desired.
///
/// # Examples
///
/// ```
/// use pretty_assertions::assert_eq;
///
/// let a = 3;
/// let b = 1 + 2;
/// assert_eq!(a, b);
///
/// assert_eq!(a, b, "we are testing addition with {} and {}", a, b);
/// ```
#[macro_export]
macro_rules! assert_eq {
($left:expr, $right:expr$(,)?) => ({
$crate::assert_eq!(@ $left, $right, "", "");
});
($left:expr, $right:expr, $($arg:tt)*) => ({
$crate::assert_eq!(@ $left, $right, ": ", $($arg)+);
});
(@ $left:expr, $right:expr, $maybe_colon:expr, $($arg:tt)*) => ({
match (&($left), &($right)) {
(left_val, right_val) => {
if !(*left_val == *right_val) {
use $crate::private::CreateComparison;
::core::panic!("assertion failed: `(left == right)`{}{}\
\n\
\n{}\
\n",
$maybe_colon,
format_args!($($arg)*),
(left_val, right_val).create_comparison()
)
}
}
}
});
}
/// Asserts that two expressions are equal to each other (using [`PartialEq`]).
///
/// On panic, this macro will print a diff derived from each value's [`str`] representation.
/// See [`StrComparison`] for further details.
///
/// This is a drop in replacement for [`core::assert_eq!`].
/// You can provide a custom panic message if desired.
///
/// # Examples
///
/// ```
/// use pretty_assertions::assert_str_eq;
///
/// let a = "foo\nbar";
/// let b = ["foo", "bar"].join("\n");
/// assert_str_eq!(a, b);
///
/// assert_str_eq!(a, b, "we are testing concatenation with {} and {}", a, b);
/// ```
#[macro_export]
macro_rules! assert_str_eq {
($left:expr, $right:expr$(,)?) => ({
$crate::assert_str_eq!(@ $left, $right, "", "");
});
($left:expr, $right:expr, $($arg:tt)*) => ({
$crate::assert_str_eq!(@ $left, $right, ": ", $($arg)+);
});
(@ $left:expr, $right:expr, $maybe_colon:expr, $($arg:tt)*) => ({
match (&($left), &($right)) {
(left_val, right_val) => {
if !(*left_val == *right_val) {
::core::panic!("assertion failed: `(left == right)`{}{}\
\n\
\n{}\
\n",
$maybe_colon,
format_args!($($arg)*),
$crate::StrComparison::new(left_val, right_val)
)
}
}
}
});
}
/// Asserts that two expressions are not equal to each other (using [`PartialEq`]).
///
/// On panic, this macro will print the values of the expressions with their
/// [`Debug`] representations.
///
/// This is a drop in replacement for [`core::assert_ne!`].
/// You can provide a custom panic message if desired.
///
/// # Examples
///
/// ```
/// use pretty_assertions::assert_ne;
///
/// let a = 3;
/// let b = 2;
/// assert_ne!(a, b);
///
/// assert_ne!(a, b, "we are testing that the values are not equal");
/// ```
#[macro_export]
macro_rules! assert_ne {
($left:expr, $right:expr$(,)?) => ({
$crate::assert_ne!(@ $left, $right, "", "");
});
($left:expr, $right:expr, $($arg:tt)+) => ({
$crate::assert_ne!(@ $left, $right, ": ", $($arg)+);
});
(@ $left:expr, $right:expr, $maybe_colon:expr, $($arg:tt)+) => ({
match (&($left), &($right)) {
(left_val, right_val) => {
if *left_val == *right_val {
::core::panic!("assertion failed: `(left != right)`{}{}\
\n\
\nBoth sides:\
\n{:#?}\
\n\
\n",
$maybe_colon,
format_args!($($arg)+),
left_val
)
}
}
}
});
}
/// Asserts that a value matches a pattern.
///
/// On panic, this macro will print a diff derived from [`Debug`] representation of
/// the value, and a string representation of the pattern.
///
/// This is a drop in replacement for [`core::assert_matches::assert_matches!`].
/// You can provide a custom panic message if desired.
///
/// # Examples
///
/// ```
/// use pretty_assertions::assert_matches;
///
/// let a = Some(3);
/// assert_matches!(a, Some(_));
///
/// assert_matches!(a, Some(value) if value > 2, "we are testing {:?} with a pattern", a);
/// ```
///
/// # Features
///
/// Requires the `unstable` feature to be enabled.
///
/// **Please note:** implementation under the `unstable` feature may be changed between
/// patch versions without warning.
#[cfg(feature = "unstable")]
#[macro_export]
macro_rules! assert_matches {
($left:expr, $( $pattern:pat )|+ $( if $guard: expr )? $(,)?) => ({
match $left {
$( $pattern )|+ $( if $guard )? => {}
ref left_val => {
$crate::assert_matches!(
@
left_val,
::core::stringify!($($pattern)|+ $(if $guard)?),
"",
""
);
}
}
});
($left:expr, $( $pattern:pat )|+ $( if $guard: expr )?, $($arg:tt)+) => ({
match $left {
$( $pattern )|+ $( if $guard )? => {}
ref left_val => {
$crate::assert_matches!(
@
left_val,
::core::stringify!($($pattern)|+ $(if $guard)?),
": ",
$($arg)+
);
}
}
});
(@ $left:expr, $right:expr, $maybe_colon:expr, $($arg:tt)*) => ({
match (&($left), &($right)) {
(left_val, right_val) => {
// Use the Display implementation to display the pattern,
// as using Debug would add another layer of quotes to the output.
struct Pattern<'a>(&'a str);
impl ::core::fmt::Debug for Pattern<'_> {
fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
::core::fmt::Display::fmt(self.0, f)
}
}
::core::panic!("assertion failed: `(left matches right)`{}{}\
\n\
\n{}\
\n",
$maybe_colon,
format_args!($($arg)*),
$crate::Comparison::new(left_val, &Pattern(right_val))
)
}
}
});
}
// Not public API. Used by the expansion of this crate's assert macros.
#[doc(hidden)]
pub mod private {
#[cfg(feature = "alloc")]
use alloc::string::String;
pub trait CompareAsStrByDefault: AsRef<str> {}
impl CompareAsStrByDefault for str {}
impl CompareAsStrByDefault for String {}
impl<T: CompareAsStrByDefault + ?Sized> CompareAsStrByDefault for &T {}
pub trait CreateComparison {
type Comparison;
fn create_comparison(self) -> Self::Comparison;
}
impl<'a, T, U> CreateComparison for &'a (T, U) {
type Comparison = crate::Comparison<'a, T, U>;
fn create_comparison(self) -> Self::Comparison {
crate::Comparison::new(&self.0, &self.1)
}
}
impl<'a, T, U> CreateComparison for (&'a T, &'a U)
where
T: CompareAsStrByDefault + ?Sized,
U: CompareAsStrByDefault + ?Sized,
{
type Comparison = crate::StrComparison<'a, T, U>;
fn create_comparison(self) -> Self::Comparison {
crate::StrComparison::new(self.0, self.1)
}
}
}

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@ -0,0 +1,600 @@
#[cfg(feature = "alloc")]
use alloc::format;
use core::fmt;
use yansi::{
Color::{Fixed, Green, Red, Unset},
Style,
};
macro_rules! paint {
($f:expr, $colour:expr, $fmt:expr, $($args:tt)*) => (
write!($f, "{}", $colour.paint(format!($fmt, $($args)*)))
)
}
const SIGN_RIGHT: char = '>'; // + > →
const SIGN_LEFT: char = '<'; // - < ←
/// Present the diff output for two mutliline strings in a pretty, colorised manner.
pub(crate) fn write_header(f: &mut fmt::Formatter) -> fmt::Result {
writeln!(
f,
"{} {} / {} :",
Style::new(Unset).bold().paint("Diff"),
Red.paint(format!("{} left", SIGN_LEFT)),
Green.paint(format!("right {}", SIGN_RIGHT))
)
}
/// Delay formatting this deleted chunk until later.
///
/// It can be formatted as a whole chunk by calling `flush`, or the inner value
/// obtained with `take` for further processing (such as an inline diff).
#[derive(Default)]
struct LatentDeletion<'a> {
// The most recent deleted line we've seen
value: Option<&'a str>,
// The number of deleted lines we've seen, including the current value
count: usize,
}
impl<'a> LatentDeletion<'a> {
/// Set the chunk value.
fn set(&mut self, value: &'a str) {
self.value = Some(value);
self.count += 1;
}
/// Take the underlying chunk value, if it's suitable for inline diffing.
///
/// If there is no value or we've seen more than one line, return `None`.
fn take(&mut self) -> Option<&'a str> {
if self.count == 1 {
self.value.take()
} else {
None
}
}
/// If a value is set, print it as a whole chunk, using the given formatter.
///
/// If a value is not set, reset the count to zero (as we've called `flush` twice,
/// without seeing another deletion. Therefore the line in the middle was something else).
fn flush<TWrite: fmt::Write>(&mut self, f: &mut TWrite) -> fmt::Result {
if let Some(value) = self.value {
paint!(f, Red, "{}{}", SIGN_LEFT, value)?;
writeln!(f)?;
self.value = None;
} else {
self.count = 0;
}
Ok(())
}
}
// Adapted from:
// https://github.com/johannhof/difference.rs/blob/c5749ad7d82aa3d480c15cb61af9f6baa08f116f/examples/github-style.rs
// Credits johannhof (MIT License)
/// Present the diff output for two mutliline strings in a pretty, colorised manner.
pub(crate) fn write_lines<TWrite: fmt::Write>(
f: &mut TWrite,
left: &str,
right: &str,
) -> fmt::Result {
let diff = ::diff::lines(left, right);
let mut changes = diff.into_iter().peekable();
let mut previous_deletion = LatentDeletion::default();
while let Some(change) = changes.next() {
match (change, changes.peek()) {
// If the text is unchanged, just print it plain
(::diff::Result::Both(value, _), _) => {
previous_deletion.flush(f)?;
writeln!(f, " {}", value)?;
}
// Defer any deletions to next loop
(::diff::Result::Left(deleted), _) => {
previous_deletion.flush(f)?;
previous_deletion.set(deleted);
}
// If we're being followed by more insertions, don't inline diff
(::diff::Result::Right(inserted), Some(::diff::Result::Right(_))) => {
previous_deletion.flush(f)?;
paint!(f, Green, "{}{}", SIGN_RIGHT, inserted)?;
writeln!(f)?;
}
// Otherwise, check if we need to inline diff with the previous line (if it was a deletion)
(::diff::Result::Right(inserted), _) => {
if let Some(deleted) = previous_deletion.take() {
write_inline_diff(f, deleted, inserted)?;
} else {
previous_deletion.flush(f)?;
paint!(f, Green, "{}{}", SIGN_RIGHT, inserted)?;
writeln!(f)?;
}
}
};
}
previous_deletion.flush(f)?;
Ok(())
}
/// Group character styling for an inline diff, to prevent wrapping each single
/// character in terminal styling codes.
///
/// Styles are applied automatically each time a new style is given in `write_with_style`.
struct InlineWriter<'a, Writer> {
f: &'a mut Writer,
style: Style,
}
impl<'a, Writer> InlineWriter<'a, Writer>
where
Writer: fmt::Write,
{
fn new(f: &'a mut Writer) -> Self {
InlineWriter {
f,
style: Style::new(Unset),
}
}
/// Push a new character into the buffer, specifying the style it should be written in.
fn write_with_style(&mut self, c: &char, style: Style) -> fmt::Result {
// If the style is the same as previously, just write character
if style == self.style {
write!(self.f, "{}", c)?;
} else {
// Close out previous style
self.style.fmt_suffix(self.f)?;
// Store new style and start writing it
style.fmt_prefix(self.f)?;
write!(self.f, "{}", c)?;
self.style = style;
}
Ok(())
}
/// Finish any existing style and reset to default state.
fn finish(&mut self) -> fmt::Result {
// Close out previous style
self.style.fmt_suffix(self.f)?;
writeln!(self.f)?;
self.style = Style::new(Unset);
Ok(())
}
}
/// Format a single line to show an inline diff of the two strings given.
///
/// The given strings should not have a trailing newline.
///
/// The output of this function will be two lines, each with a trailing newline.
fn write_inline_diff<TWrite: fmt::Write>(f: &mut TWrite, left: &str, right: &str) -> fmt::Result {
let diff = ::diff::chars(left, right);
let mut writer = InlineWriter::new(f);
// Print the left string on one line, with differences highlighted
let light = Style::new(Red);
let heavy = Style::new(Red).bg(Fixed(52)).bold();
writer.write_with_style(&SIGN_LEFT, light)?;
for change in diff.iter() {
match change {
::diff::Result::Both(value, _) => writer.write_with_style(value, light)?,
::diff::Result::Left(value) => writer.write_with_style(value, heavy)?,
_ => (),
}
}
writer.finish()?;
// Print the right string on one line, with differences highlighted
let light = Style::new(Green);
let heavy = Style::new(Green).bg(Fixed(22)).bold();
writer.write_with_style(&SIGN_RIGHT, light)?;
for change in diff.iter() {
match change {
::diff::Result::Both(value, _) => writer.write_with_style(value, light)?,
::diff::Result::Right(value) => writer.write_with_style(value, heavy)?,
_ => (),
}
}
writer.finish()
}
#[cfg(test)]
mod test {
use super::*;
#[cfg(feature = "alloc")]
use alloc::string::String;
// ANSI terminal codes used in our outputs.
//
// Interpolate these into test strings to make expected values easier to read.
const RED_LIGHT: &str = "\u{1b}[31m";
const GREEN_LIGHT: &str = "\u{1b}[32m";
const RED_HEAVY: &str = "\u{1b}[1;48;5;52;31m";
const GREEN_HEAVY: &str = "\u{1b}[1;48;5;22;32m";
const RESET: &str = "\u{1b}[0m";
/// Given that both of our diff printing functions have the same
/// type signature, we can reuse the same test code for them.
///
/// This could probably be nicer with traits!
fn check_printer<TPrint>(printer: TPrint, left: &str, right: &str, expected: &str)
where
TPrint: Fn(&mut String, &str, &str) -> fmt::Result,
{
let mut actual = String::new();
printer(&mut actual, left, right).expect("printer function failed");
// Cannot use IO without stdlib
#[cfg(feature = "std")]
println!(
"## left ##\n\
{}\n\
## right ##\n\
{}\n\
## actual diff ##\n\
{}\n\
## expected diff ##\n\
{}",
left, right, actual, expected
);
assert_eq!(actual, expected);
}
#[test]
fn write_inline_diff_empty() {
let left = "";
let right = "";
let expected = format!(
"{red_light}<{reset}\n\
{green_light}>{reset}\n",
red_light = RED_LIGHT,
green_light = GREEN_LIGHT,
reset = RESET,
);
check_printer(write_inline_diff, left, right, &expected);
}
#[test]
fn write_inline_diff_added() {
let left = "";
let right = "polymerase";
let expected = format!(
"{red_light}<{reset}\n\
{green_light}>{reset}{green_heavy}polymerase{reset}\n",
red_light = RED_LIGHT,
green_light = GREEN_LIGHT,
green_heavy = GREEN_HEAVY,
reset = RESET,
);
check_printer(write_inline_diff, left, right, &expected);
}
#[test]
fn write_inline_diff_removed() {
let left = "polyacrylamide";
let right = "";
let expected = format!(
"{red_light}<{reset}{red_heavy}polyacrylamide{reset}\n\
{green_light}>{reset}\n",
red_light = RED_LIGHT,
green_light = GREEN_LIGHT,
red_heavy = RED_HEAVY,
reset = RESET,
);
check_printer(write_inline_diff, left, right, &expected);
}
#[test]
fn write_inline_diff_changed() {
let left = "polymerase";
let right = "polyacrylamide";
let expected = format!(
"{red_light}<poly{reset}{red_heavy}me{reset}{red_light}ra{reset}{red_heavy}s{reset}{red_light}e{reset}\n\
{green_light}>poly{reset}{green_heavy}ac{reset}{green_light}r{reset}{green_heavy}yl{reset}{green_light}a{reset}{green_heavy}mid{reset}{green_light}e{reset}\n",
red_light = RED_LIGHT,
green_light = GREEN_LIGHT,
red_heavy = RED_HEAVY,
green_heavy = GREEN_HEAVY,
reset = RESET,
);
check_printer(write_inline_diff, left, right, &expected);
}
/// If one of our strings is empty, it should not be shown at all in the output.
#[test]
fn write_lines_empty_string() {
let left = "";
let right = "content";
let expected = format!(
"{green_light}>content{reset}\n",
green_light = GREEN_LIGHT,
reset = RESET,
);
check_printer(write_lines, left, right, &expected);
}
/// Realistic multiline struct diffing case.
#[test]
fn write_lines_struct() {
let left = r#"Some(
Foo {
lorem: "Hello World!",
ipsum: 42,
dolor: Ok(
"hey",
),
},
)"#;
let right = r#"Some(
Foo {
lorem: "Hello Wrold!",
ipsum: 42,
dolor: Ok(
"hey ho!",
),
},
)"#;
let expected = format!(
r#" Some(
Foo {{
{red_light}< lorem: "Hello W{reset}{red_heavy}o{reset}{red_light}rld!",{reset}
{green_light}> lorem: "Hello Wr{reset}{green_heavy}o{reset}{green_light}ld!",{reset}
ipsum: 42,
dolor: Ok(
{red_light}< "hey",{reset}
{green_light}> "hey{reset}{green_heavy} ho!{reset}{green_light}",{reset}
),
}},
)
"#,
red_light = RED_LIGHT,
red_heavy = RED_HEAVY,
green_light = GREEN_LIGHT,
green_heavy = GREEN_HEAVY,
reset = RESET,
);
check_printer(write_lines, left, right, &expected);
}
/// Relistic multiple line chunks
///
/// We can't support realistic line diffing in large blocks
/// (also, it's unclear how usefult this is)
///
/// So if we have more than one line in a single removal chunk, disable inline diffing.
#[test]
fn write_lines_multiline_block() {
let left = r#"Proboscis
Cabbage"#;
let right = r#"Probed
Caravaggio"#;
let expected = format!(
r#"{red_light}<Proboscis{reset}
{red_light}<Cabbage{reset}
{green_light}>Probed{reset}
{green_light}>Caravaggio{reset}
"#,
red_light = RED_LIGHT,
green_light = GREEN_LIGHT,
reset = RESET,
);
check_printer(write_lines, left, right, &expected);
}
/// Single deletion line, multiple insertions - no inline diffing.
#[test]
fn write_lines_multiline_insert() {
let left = r#"Cabbage"#;
let right = r#"Probed
Caravaggio"#;
let expected = format!(
r#"{red_light}<Cabbage{reset}
{green_light}>Probed{reset}
{green_light}>Caravaggio{reset}
"#,
red_light = RED_LIGHT,
green_light = GREEN_LIGHT,
reset = RESET,
);
check_printer(write_lines, left, right, &expected);
}
/// Multiple deletion, single insertion - no inline diffing.
#[test]
fn write_lines_multiline_delete() {
let left = r#"Proboscis
Cabbage"#;
let right = r#"Probed"#;
let expected = format!(
r#"{red_light}<Proboscis{reset}
{red_light}<Cabbage{reset}
{green_light}>Probed{reset}
"#,
red_light = RED_LIGHT,
green_light = GREEN_LIGHT,
reset = RESET,
);
check_printer(write_lines, left, right, &expected);
}
/// Regression test for multiline highlighting issue
#[test]
fn write_lines_issue12() {
let left = r#"[
0,
0,
0,
128,
10,
191,
5,
64,
]"#;
let right = r#"[
84,
248,
45,
64,
]"#;
let expected = format!(
r#" [
{red_light}< 0,{reset}
{red_light}< 0,{reset}
{red_light}< 0,{reset}
{red_light}< 128,{reset}
{red_light}< 10,{reset}
{red_light}< 191,{reset}
{red_light}< 5,{reset}
{green_light}> 84,{reset}
{green_light}> 248,{reset}
{green_light}> 45,{reset}
64,
]
"#,
red_light = RED_LIGHT,
green_light = GREEN_LIGHT,
reset = RESET,
);
check_printer(write_lines, left, right, &expected);
}
mod write_lines_edge_newlines {
use super::*;
#[test]
fn both_trailing() {
let left = "fan\n";
let right = "mug\n";
// Note the additional space at the bottom is caused by a trailing newline
// adding an additional line with zero content to both sides of the diff
let expected = format!(
r#"{red_light}<{reset}{red_heavy}fan{reset}
{green_light}>{reset}{green_heavy}mug{reset}
"#,
red_light = RED_LIGHT,
red_heavy = RED_HEAVY,
green_light = GREEN_LIGHT,
green_heavy = GREEN_HEAVY,
reset = RESET,
);
check_printer(write_lines, left, right, &expected);
}
#[test]
fn both_leading() {
let left = "\nfan";
let right = "\nmug";
// Note the additional space at the top is caused by a leading newline
// adding an additional line with zero content to both sides of the diff
let expected = format!(
r#"
{red_light}<{reset}{red_heavy}fan{reset}
{green_light}>{reset}{green_heavy}mug{reset}
"#,
red_light = RED_LIGHT,
red_heavy = RED_HEAVY,
green_light = GREEN_LIGHT,
green_heavy = GREEN_HEAVY,
reset = RESET,
);
check_printer(write_lines, left, right, &expected);
}
#[test]
fn leading_added() {
let left = "fan";
let right = "\nmug";
let expected = format!(
r#"{red_light}<fan{reset}
{green_light}>{reset}
{green_light}>mug{reset}
"#,
red_light = RED_LIGHT,
green_light = GREEN_LIGHT,
reset = RESET,
);
check_printer(write_lines, left, right, &expected);
}
#[test]
fn leading_deleted() {
let left = "\nfan";
let right = "mug";
let expected = format!(
r#"{red_light}<{reset}
{red_light}<fan{reset}
{green_light}>mug{reset}
"#,
red_light = RED_LIGHT,
green_light = GREEN_LIGHT,
reset = RESET,
);
check_printer(write_lines, left, right, &expected);
}
#[test]
fn trailing_added() {
let left = "fan";
let right = "mug\n";
let expected = format!(
r#"{red_light}<fan{reset}
{green_light}>mug{reset}
{green_light}>{reset}
"#,
red_light = RED_LIGHT,
green_light = GREEN_LIGHT,
reset = RESET,
);
check_printer(write_lines, left, right, &expected);
}
/// Regression test for double abort
///
/// See: https://github.com/rust-pretty-assertions/rust-pretty-assertions/issues/96
#[test]
fn trailing_deleted() {
// The below inputs caused an abort via double panic
// we panicked at 'insertion followed by deletion'
let left = "fan\n";
let right = "mug";
let expected = format!(
r#"{red_light}<{reset}{red_heavy}fan{reset}
{green_light}>{reset}{green_heavy}mug{reset}
{red_light}<{reset}
"#,
red_light = RED_LIGHT,
red_heavy = RED_HEAVY,
green_light = GREEN_LIGHT,
green_heavy = GREEN_HEAVY,
reset = RESET,
);
check_printer(write_lines, left, right, &expected);
}
}
}

392
third-party/vendor/pretty_assertions/tests/macros.rs vendored Normal file
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@ -0,0 +1,392 @@
#![cfg_attr(not(feature = "std"), no_std)]
#![no_implicit_prelude]
#[cfg(feature = "alloc")]
extern crate alloc;
#[allow(clippy::eq_op)]
mod assert_str_eq {
use ::core::{cmp::PartialEq, convert::AsRef};
#[cfg(feature = "alloc")]
use ::alloc::string::{String, ToString};
#[cfg(feature = "std")]
use ::std::string::{String, ToString};
#[test]
fn passes_str() {
let a = "some value";
::pretty_assertions::assert_str_eq!(a, a);
}
#[test]
fn passes_string() {
let a: String = "some value".to_string();
::pretty_assertions::assert_str_eq!(a, a);
}
#[test]
fn passes_comparable_types() {
let s0: &'static str = "foo";
let s1: String = "foo".to_string();
::pretty_assertions::assert_str_eq!(s0, s1);
}
#[derive(PartialEq)]
struct MyString(String);
impl AsRef<str> for MyString {
fn as_ref(&self) -> &str {
&self.0
}
}
impl PartialEq<String> for MyString {
fn eq(&self, other: &String) -> bool {
&self.0 == other
}
}
#[test]
fn passes_as_ref_types() {
let s0 = MyString("foo".to_string());
let s1 = "foo".to_string();
::pretty_assertions::assert_str_eq!(s0, s1);
}
#[test]
#[should_panic(expected = r#"assertion failed: `(left == right)`
Diff < left / right > :
foo
<bar
>baz
"#)]
fn fails_as_ref_types() {
let s0 = MyString("foo\nbar".to_string());
let s1 = "foo\nbaz".to_string();
::pretty_assertions::assert_str_eq!(s0, s1);
}
#[test]
#[should_panic(expected = r#"assertion failed: `(left == right)`
Diff < left / right > :
foo
<bar
>baz
"#)]
fn fails_foo() {
::pretty_assertions::assert_str_eq!("foo\nbar", "foo\nbaz");
}
}
#[allow(clippy::eq_op)]
mod assert_eq {
#[cfg(feature = "alloc")]
use ::alloc::string::{String, ToString};
#[cfg(feature = "std")]
use ::std::string::{String, ToString};
#[test]
fn passes() {
let a = "some value";
::pretty_assertions::assert_eq!(a, a);
}
#[test]
fn passes_unsized() {
let a: &[u8] = b"e";
::pretty_assertions::assert_eq!(*a, *a);
}
#[test]
fn passes_comparable_types() {
let s0: &'static str = "foo";
let s1: String = "foo".to_string();
::pretty_assertions::assert_eq!(s0, s1);
}
#[test]
#[should_panic(expected = r#"assertion failed: `(left == right)`
Diff < left / right > :
<666
>999
"#)]
fn fails() {
::pretty_assertions::assert_eq!(666, 999);
}
#[test]
#[should_panic(expected = r#"assertion failed: `(left == right)`
Diff < left / right > :
<666
>999
"#)]
fn fails_trailing_comma() {
::pretty_assertions::assert_eq!(666, 999,);
}
#[test]
#[should_panic(expected = r#"assertion failed: `(left == right)`
Diff < left / right > :
[
101,
> 101,
]
"#)]
fn fails_unsized() {
let a: &[u8] = b"e";
let b: &[u8] = b"ee";
::pretty_assertions::assert_eq!(*a, *b);
}
#[test]
#[should_panic(
expected = r#"assertion failed: `(left == right)`: custom panic message
Diff < left / right > :
<666
>999
"#
)]
fn fails_custom() {
::pretty_assertions::assert_eq!(666, 999, "custom panic message");
}
#[test]
#[should_panic(
expected = r#"assertion failed: `(left == right)`: custom panic message
Diff < left / right > :
<666
>999
"#
)]
fn fails_custom_trailing_comma() {
::pretty_assertions::assert_eq!(666, 999, "custom panic message",);
}
#[test]
#[should_panic(expected = r#"assertion failed: `(left == right)`
Diff < left / right > :
foo
<bar
>baz
"#)]
fn fails_str() {
::pretty_assertions::assert_eq!("foo\nbar", "foo\nbaz");
}
#[test]
#[should_panic(expected = r#"assertion failed: `(left == right)`
Diff < left / right > :
foo
<bar
>baz
"#)]
fn fails_string() {
::pretty_assertions::assert_eq!("foo\nbar".to_string(), "foo\nbaz".to_string());
}
}
mod assert_ne {
#[cfg(feature = "alloc")]
use ::alloc::string::{String, ToString};
#[cfg(feature = "std")]
use ::std::string::{String, ToString};
#[test]
fn passes() {
let a = "a";
let b = "b";
::pretty_assertions::assert_ne!(a, b);
}
#[test]
fn passes_unsized() {
let a: &[u8] = b"e";
let b: &[u8] = b"ee";
::pretty_assertions::assert_ne!(*a, *b);
}
#[test]
fn passes_comparable_types() {
let s0: &'static str = "foo";
let s1: String = "bar".to_string();
::pretty_assertions::assert_ne!(s0, s1);
}
#[test]
#[should_panic(expected = r#"assertion failed: `(left != right)`
Both sides:
666
"#)]
fn fails() {
::pretty_assertions::assert_ne!(666, 666);
}
#[test]
#[should_panic(expected = r#"assertion failed: `(left != right)`
Both sides:
666
"#)]
fn fails_trailing_comma() {
::pretty_assertions::assert_ne!(666, 666,);
}
#[test]
#[should_panic(expected = r#"assertion failed: `(left != right)`
Both sides:
[
101,
]
"#)]
fn fails_unsized() {
let a: &[u8] = b"e";
::pretty_assertions::assert_ne!(*a, *a);
}
#[test]
#[should_panic(
expected = r#"assertion failed: `(left != right)`: custom panic message
Both sides:
666
"#
)]
fn fails_custom() {
::pretty_assertions::assert_ne!(666, 666, "custom panic message");
}
#[test]
#[should_panic(
expected = r#"assertion failed: `(left != right)`: custom panic message
Both sides:
666
"#
)]
fn fails_custom_trailing_comma() {
::pretty_assertions::assert_ne!(666, 666, "custom panic message",);
}
// If the values are equal but their debug outputs are not
// show a specific warning
// Regression tests
#[test]
#[should_panic]
fn assert_ne_non_empty_return() {
fn not_zero(x: u32) -> u32 {
::pretty_assertions::assert_ne!(x, 0);
x
}
not_zero(0);
}
}
#[cfg(feature = "unstable")]
mod assert_matches {
use ::core::option::Option::{None, Some};
#[test]
fn passes() {
let a = Some("some value");
::pretty_assertions::assert_matches!(a, Some(_));
}
#[test]
fn passes_unsized() {
let a: &[u8] = b"e";
::pretty_assertions::assert_matches!(*a, _);
}
#[test]
#[should_panic(expected = r#"assertion failed: `(left matches right)`
Diff < left / right > :
<None
>Some(_)
"#)]
fn fails() {
::pretty_assertions::assert_matches!(None::<usize>, Some(_));
}
#[test]
#[should_panic(expected = r#"assertion failed: `(left matches right)`
Diff < left / right > :
<Some(
< 3,
<)
>Some(3) if 0 > 0
"#)]
fn fails_guard() {
::pretty_assertions::assert_matches!(Some(3), Some(3) if 0 > 0,);
}
#[test]
#[should_panic(expected = r#"assertion failed: `(left matches right)`
Diff < left / right > :
<[
< 101,
<]
>ref b if b == b"ee"
"#)]
fn fails_unsized() {
let a: &[u8] = b"e";
::pretty_assertions::assert_matches!(*a, ref b if b == b"ee");
}
#[test]
#[should_panic(
expected = r#"assertion failed: `(left matches right)`: custom panic message
Diff < left / right > :
<666
>999
"#
)]
fn fails_custom() {
::pretty_assertions::assert_matches!(666, 999, "custom panic message");
}
#[test]
#[should_panic(
expected = r#"assertion failed: `(left matches right)`: custom panic message
Diff < left / right > :
<666
>999
"#
)]
fn fails_custom_trailing_comma() {
::pretty_assertions::assert_matches!(666, 999, "custom panic message",);
}
}