283 lines
9.9 KiB
Rust

use std::borrow::Cow;
use std::collections::HashMap;
use std::path::{Path, PathBuf};
use std::sync::Mutex;
pub use insta;
use once_cell::sync::Lazy;
static SNAPSHOT_NAMES: Lazy<Mutex<HashMap<PathBuf, usize>>> = Lazy::new(Mutex::default);
/// Return the md5 hash of the given string
pub fn hash_snapshot(snap: &str) -> String {
let hash = md5::compute(snap.as_bytes());
let hash_str = format!("{hash:x}");
hash_str
}
#[track_caller]
pub fn default_snapshot_settings_for_test<'a>(
test_name: &str,
name: Option<&'a str>,
) -> (insta::Settings, Cow<'a, str>, bool) {
let mut settings = insta::Settings::clone_current();
settings.set_prepend_module_to_snapshot(false);
let path = Path::new(std::panic::Location::caller().file());
let filename = path.file_name().unwrap().to_str().unwrap();
settings.set_omit_expression(true);
let test_name = test_name.strip_suffix("::{{closure}}").unwrap_or(test_name);
let test_name = test_name.rsplit("::").next().unwrap().to_owned();
let path = Path::new("snapshots").join(filename).join(test_name);
settings.set_snapshot_path(path.clone());
let snap_name = if let Some(name) = name {
Cow::Borrowed(name)
} else {
let mut snapshot_names = SNAPSHOT_NAMES.lock().unwrap();
let counter = snapshot_names.entry(path).or_default();
*counter += 1;
Cow::Owned(format!("{counter}"))
};
let store_whole_snapshot =
std::env::var("MEILI_TEST_FULL_SNAPS").unwrap_or_else(|_| "false".to_owned());
let store_whole_snapshot: bool = store_whole_snapshot.parse().unwrap();
(settings, snap_name, store_whole_snapshot)
}
/**
Create a hashed snapshot test.
## Arguments:
1. The content of the snapshot. It is an expression whose result implements the `fmt::Display` trait.
2. `name: <name>`: the identifier for the snapshot test (optional)
3. `@""` to write the hash of the snapshot inline
## Behaviour
The content of the snapshot will be saved both in full and as a hash. The full snapshot will
be saved with the name `<name>.full.snap` but will not be saved to the git repository. The hashed
snapshot will be saved inline. If `<name>` is not specified, then a global counter is used to give an
identifier to the snapshot.
Running `cargo test` will check whether the old snapshot is identical to the
current one. If they are equal, the test passes. Otherwise, the test fails.
Use the command line `cargo insta` to approve or reject new snapshots.
## Example
```ignore
// The full snapshot is saved under 1.full.snap and contains `10`
snapshot_hash!(10, @"d3d9446802a44259755d38e6d163e820");
// The full snapshot is saved under snap_name.full.snap and contains `hello world`
snapshot_hash!("hello world", name: "snap_name", @"5f93f983524def3dca464469d2cf9f3e");
```
*/
#[macro_export]
macro_rules! snapshot_hash {
($value:expr, @$inline:literal) => {
let test_name = {
fn f() {}
fn type_name_of_val<T>(_: T) -> &'static str {
std::any::type_name::<T>()
}
type_name_of_val(f).strip_suffix("::f").unwrap_or("")
};
let test_name = test_name
.strip_suffix("::{{closure}}")
.unwrap_or(test_name);
let (settings, snap_name, store_whole_snapshot) = $crate::default_snapshot_settings_for_test(test_name, None);
settings.bind(|| {
let snap = format!("{}", $value);
let hash_snap = $crate::hash_snapshot(&snap);
meili_snap::insta::assert_snapshot!(hash_snap, @$inline);
if store_whole_snapshot {
meili_snap::insta::assert_snapshot!(format!("{}.full", snap_name), snap);
}
});
};
($value:expr, name: $name:expr, @$inline:literal) => {
let test_name = {
fn f() {}
fn type_name_of_val<T>(_: T) -> &'static str {
std::any::type_name::<T>()
}
type_name_of_val(f).strip_suffix("::f").unwrap_or("")
};
let snap_name = format!("{}", $name);
let (settings, snap_name, store_whole_snapshot) = $crate::default_snapshot_settings_for_test(test_name, Some(&snap_name));
settings.bind(|| {
let snap = format!("{}", $value);
let hash_snap = $crate::hash_snapshot(&snap);
meili_snap::insta::assert_snapshot!(hash_snap, @$inline);
if store_whole_snapshot {
meili_snap::insta::assert_snapshot!(format!("{}.full", snap_name), snap);
}
});
};
}
/**
Create a hashed snapshot test.
## Arguments:
1. The content of the snapshot. It is an expression whose result implements the `fmt::Display` trait.
2. Optionally one of:
1. `name: <name>`: the identifier for the snapshot test
2. `@""` to write the hash of the snapshot inline
## Behaviour
The content of the snapshot will be saved in full with the given name
or using a global counter to give it an identifier.
Running `cargo test` will check whether the old snapshot is identical to the
current one. If they are equal, the test passes. Otherwise, the test fails.
Use the command line `cargo insta` to approve or reject new snapshots.
## Example
```ignore
// The full snapshot is saved under 1.snap and contains `10`
snapshot!(10);
// The full snapshot is saved under snap_name.snap and contains `10`
snapshot!("hello world", name: "snap_name");
// The full snapshot is saved inline
snapshot!(format!("{:?}", vec![1, 2]), @"[1, 2]");
```
*/
#[macro_export]
macro_rules! snapshot {
($value:expr, name: $name:expr) => {
let test_name = {
fn f() {}
fn type_name_of_val<T>(_: T) -> &'static str {
std::any::type_name::<T>()
}
type_name_of_val(f).strip_suffix("::f").unwrap_or("")
};
let test_name = test_name
.strip_suffix("::{{closure}}")
.unwrap_or(test_name);
let snap_name = format!("{}", $name);
let (settings, snap_name, _) = $crate::default_snapshot_settings_for_test(test_name, Some(&snap_name));
settings.bind(|| {
let snap = format!("{}", $value);
insta::allow_duplicates! {
meili_snap::insta::assert_snapshot!(format!("{}", snap_name), snap);
}
});
};
($value:expr, @$inline:literal) => {
// Note that the name given as argument does not matter since it is only an inline snapshot
// We don't pass None because otherwise `meili-snap` will try to assign it a unique identifier
let (settings, _, _) = $crate::default_snapshot_settings_for_test("", Some("_dummy_argument"));
settings.bind(|| {
let snap = format!("{}", $value);
insta::allow_duplicates! {
meili_snap::insta::assert_snapshot!(snap, @$inline);
}
});
};
($value:expr) => {
let test_name = {
fn f() {}
fn type_name_of_val<T>(_: T) -> &'static str {
std::any::type_name::<T>()
}
type_name_of_val(f).strip_suffix("::f").unwrap_or("")
};
let test_name = test_name
.strip_suffix("::{{closure}}")
.unwrap_or(test_name);
let (settings, snap_name, _) = $crate::default_snapshot_settings_for_test(test_name, None);
settings.bind(|| {
let snap = format!("{}", $value);
insta::allow_duplicates! {
meili_snap::insta::assert_snapshot!(format!("{}", snap_name), snap);
}
});
};
}
/// Create a string from the value by serializing it as Json, optionally
/// redacting some parts of it.
///
/// The second argument to the macro can be an object expression for redaction.
/// It's in the form { selector => replacement }. For more information about redactions
/// refer to the redactions feature in the `insta` guide.
#[macro_export]
macro_rules! json_string {
($value:expr, {$($k:expr => $v:expr),*$(,)?}) => {
{
let (_, snap) = meili_snap::insta::_prepare_snapshot_for_redaction!($value, {$($k => $v),*}, Json, File);
snap
}
};
($value:expr) => {{
let value = meili_snap::insta::_macro_support::serialize_value(
&$value,
meili_snap::insta::_macro_support::SerializationFormat::Json,
meili_snap::insta::_macro_support::SnapshotLocation::File
);
value
}};
}
#[cfg(test)]
mod tests {
use crate as meili_snap;
#[test]
fn snap() {
snapshot_hash!(10, @"d3d9446802a44259755d38e6d163e820");
snapshot_hash!(20, @"98f13708210194c475687be6106a3b84");
snapshot_hash!(30, @"34173cb38f07f89ddbebc2ac9128303f");
snapshot!(40, @"40");
snapshot!(50, @"50");
snapshot!(60, @"60");
snapshot!(70);
snapshot!(80);
snapshot!(90);
snapshot!(100, name: "snap_name_1");
snapshot_hash!(110, name: "snap_name_2", @"5f93f983524def3dca464469d2cf9f3e");
snapshot!(120);
snapshot!(format!("{:?}", vec![1, 2]), @"[1, 2]");
}
// Currently the name of this module is not part of the snapshot path
// It does not bother me, but maybe it is worth changing later on.
mod snap {
use crate as meili_snap;
#[test]
fn some_test() {
snapshot_hash!(10, @"d3d9446802a44259755d38e6d163e820");
snapshot_hash!(20, @"98f13708210194c475687be6106a3b84");
snapshot_hash!(30, @"34173cb38f07f89ddbebc2ac9128303f");
snapshot!(40, @"40");
snapshot!(50, @"50");
snapshot!(60, @"60");
snapshot!(70);
snapshot!(80);
snapshot!(90);
snapshot!(100, name: "snap_name_1");
snapshot_hash!(110, name: "snap_name_2", @"5f93f983524def3dca464469d2cf9f3e");
snapshot!(120);
// snapshot_hash!("", name: "", @"d41d8cd98f00b204e9800998ecf8427e");
}
}
}