/
proptest.rs
451 lines (407 loc) · 17.2 KB
/
proptest.rs
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// SPDX-License-Identifier: MPL-2.0
use std::{collections::BTreeSet as Set, error::Error};
use pubgrub::range::Range;
use pubgrub::solver::{resolve, DependencyProvider, OfflineDependencyProvider};
use pubgrub::type_aliases::Map;
use pubgrub::{
error::PubGrubError, package::Package, report::DefaultStringReporter, report::Reporter,
version::NumberVersion, version::Version,
};
use proptest::collection::{btree_map, vec};
use proptest::prelude::*;
use proptest::sample::Index;
use proptest::string::string_regex;
mod sat_dependency_provider;
use crate::sat_dependency_provider::SatResolve;
/// The same as DP but takes versions from the opposite end:
/// if DP returns versions from newest to oldest, this returns them from oldest to newest.
#[derive(Clone)]
struct ReverseDependencyProvider<DP>(DP);
impl<P: Package, V: Version, DP: DependencyProvider<P, V>> DependencyProvider<P, V>
for ReverseDependencyProvider<DP>
{
fn list_available_versions(&self, p: &P) -> Result<Vec<V>, Box<dyn Error>> {
self.0.list_available_versions(p).map(|mut v| {
v.reverse();
v
})
}
fn get_dependencies(&self, p: &P, v: &V) -> Result<Option<Map<P, Range<V>>>, Box<dyn Error>> {
self.0.get_dependencies(p, v)
}
}
/// The same as DP but it has a timeout.
#[derive(Clone)]
struct TimeoutDependencyProvider<DP> {
dp: DP,
start_time: std::time::Instant,
call_count: std::cell::Cell<u64>,
max_calls: u64,
}
impl<DP> TimeoutDependencyProvider<DP> {
fn new(dp: DP, max_calls: u64) -> Self {
Self {
dp,
start_time: std::time::Instant::now(),
call_count: std::cell::Cell::new(0),
max_calls,
}
}
}
impl<P: Package, V: Version, DP: DependencyProvider<P, V>> DependencyProvider<P, V>
for TimeoutDependencyProvider<DP>
{
fn list_available_versions(&self, p: &P) -> Result<Vec<V>, Box<dyn Error>> {
self.dp.list_available_versions(p)
}
fn get_dependencies(&self, p: &P, v: &V) -> Result<Option<Map<P, Range<V>>>, Box<dyn Error>> {
self.dp.get_dependencies(p, v)
}
fn should_cancel(&self) -> Result<(), Box<dyn Error>> {
assert!(self.start_time.elapsed().as_secs() < 60);
let calls = self.call_count.get();
assert!(calls < self.max_calls);
self.call_count.set(calls + 1);
Ok(())
}
}
#[test]
#[should_panic]
fn should_cancel_can_panic() {
let mut dependency_provider = OfflineDependencyProvider::<_, NumberVersion>::new();
dependency_provider.add_dependencies(0, 0, vec![(666, Range::any())]);
// Run the algorithm.
let _ = resolve(
&TimeoutDependencyProvider::new(dependency_provider, 1),
0,
0,
);
}
fn string_names() -> impl Strategy<Value = String> {
string_regex("[A-Za-z][A-Za-z0-9_-]{0,5}")
.unwrap()
.prop_filter("reserved names", |n| {
// root is the name of the thing being compiled
// so it would be confusing to have it in the index
// bad is a name reserved for a dep that won't work
n != "root" && n != "bad"
})
}
/// This generates a random registry index.
/// Unlike vec((Name, Ver, vec((Name, VerRq), ..), ..)
/// This strategy has a high probability of having valid dependencies
pub fn registry_strategy<N: Package + Ord>(
name: impl Strategy<Value = N>,
bad_name: N,
) -> impl Strategy<
Value = (
OfflineDependencyProvider<N, NumberVersion>,
Vec<(N, NumberVersion)>,
),
> {
let max_crates = 40;
let max_versions = 15;
let shrinkage = 40;
let complicated_len = 10usize;
// If this is false than the crate will depend on the nonexistent "bad"
// instead of the complex set we generated for it.
let allow_deps = prop::bool::weighted(0.99);
let a_version = ..(max_versions as u32);
let list_of_versions = btree_map(a_version, allow_deps, 1..=max_versions)
.prop_map(move |ver| ver.into_iter().collect::<Vec<_>>());
let list_of_crates_with_versions = btree_map(name, list_of_versions, 1..=max_crates);
// each version of each crate can depend on each crate smaller then it.
// In theory shrinkage should be 2, but in practice we get better trees with a larger value.
let max_deps = max_versions * (max_crates * (max_crates - 1)) / shrinkage;
let raw_version_range = (any::<Index>(), any::<Index>());
let raw_dependency = (any::<Index>(), any::<Index>(), raw_version_range);
fn order_index(a: Index, b: Index, size: usize) -> (usize, usize) {
use std::cmp::{max, min};
let (a, b) = (a.index(size), b.index(size));
(min(a, b), max(a, b))
}
let list_of_raw_dependency = vec(raw_dependency, ..=max_deps);
// By default a package depends only on other packages that have a smaller name,
// this helps make sure that all things in the resulting index are DAGs.
// If this is true then the DAG is maintained with grater instead.
let reverse_alphabetical = any::<bool>().no_shrink();
(
list_of_crates_with_versions,
list_of_raw_dependency,
reverse_alphabetical,
1..(complicated_len + 1),
)
.prop_map(
move |(crate_vers_by_name, raw_dependencies, reverse_alphabetical, complicated_len)| {
let mut list_of_pkgid: Vec<(
(N, NumberVersion),
Option<Vec<(N, Range<NumberVersion>)>>,
)> = crate_vers_by_name
.iter()
.flat_map(|(name, vers)| {
vers.iter().map(move |x| {
(
(name.clone(), NumberVersion::from(x.0)),
if x.1 { Some(vec![]) } else { None },
)
})
})
.collect();
let len_all_pkgid = list_of_pkgid.len();
for (a, b, (c, d)) in raw_dependencies {
let (a, b) = order_index(a, b, len_all_pkgid);
let (a, b) = if reverse_alphabetical { (b, a) } else { (a, b) };
let ((dep_name, _), _) = list_of_pkgid[a].to_owned();
if &(list_of_pkgid[b].0).0 == &dep_name {
continue;
}
let s = &crate_vers_by_name[&dep_name];
let s_last_index = s.len() - 1;
let (c, d) = order_index(c, d, s.len());
if let (_, Some(deps)) = &mut list_of_pkgid[b] {
deps.push((
dep_name,
if c == 0 && d == s_last_index {
Range::any()
} else if c == 0 {
Range::strictly_lower_than(s[d].0 + 1)
} else if d == s_last_index {
Range::higher_than(s[c].0)
} else if c == d {
Range::exact(s[c].0)
} else {
Range::between(s[c].0, s[d].0 + 1)
},
))
}
}
let mut dependency_provider = OfflineDependencyProvider::<N, NumberVersion>::new();
let complicated_len = std::cmp::min(complicated_len, list_of_pkgid.len());
let complicated: Vec<_> = if reverse_alphabetical {
&list_of_pkgid[..complicated_len]
} else {
&list_of_pkgid[(list_of_pkgid.len() - complicated_len)..]
}
.iter()
.map(|(x, _)| (x.0.clone(), x.1))
.collect();
for ((name, ver), deps) in list_of_pkgid {
dependency_provider.add_dependencies(
name,
ver,
deps.unwrap_or_else(|| vec![(bad_name.clone(), Range::any())]),
);
}
(dependency_provider, complicated)
},
)
}
/// Ensures that generator makes registries with large dependency trees.
#[test]
fn meta_test_deep_trees_from_strategy() {
use proptest::strategy::ValueTree;
use proptest::test_runner::TestRunner;
let mut dis = [0; 21];
let strategy = registry_strategy(0u16..665, 666);
let mut test_runner = TestRunner::deterministic();
for _ in 0..128 {
let (dependency_provider, cases) = strategy
.new_tree(&mut TestRunner::new_with_rng(
Default::default(),
test_runner.new_rng(),
))
.unwrap()
.current();
for (name, ver) in cases {
let res = resolve(&dependency_provider, name, ver);
dis[res
.as_ref()
.map(|x| std::cmp::min(x.len(), dis.len()) - 1)
.unwrap_or(0)] += 1;
if dis.iter().all(|&x| x > 0) {
return;
}
}
}
panic!(
"In {} tries we did not see a wide enough distribution of dependency trees! dis: {:?}",
dis.iter().sum::<i32>(),
dis
);
}
proptest! {
#![proptest_config(ProptestConfig {
max_shrink_iters:
if std::env::var("CI").is_ok() {
// This attempts to make sure that CI will fail fast,
0
} else {
// but that local builds will give a small clear test case.
2048
},
result_cache: prop::test_runner::basic_result_cache,
.. ProptestConfig::default()
})]
#[test]
/// This test is mostly for profiling.
fn prop_passes_string(
(dependency_provider, cases) in registry_strategy(string_names(), "bad".to_owned())
) {
for (name, ver) in cases {
let _ = resolve(&TimeoutDependencyProvider::new(dependency_provider.clone(), 50_000), name, ver);
}
}
#[test]
/// This test is mostly for profiling.
fn prop_passes_int(
(dependency_provider, cases) in registry_strategy(0u16..665, 666)
) {
for (name, ver) in cases {
let _ = resolve(&TimeoutDependencyProvider::new(dependency_provider.clone(), 50_000), name, ver);
}
}
#[test]
fn prop_sat_errors_the_same(
(dependency_provider, cases) in registry_strategy(0u16..665, 666)
) {
let mut sat = SatResolve::new(&dependency_provider);
for (name, ver) in cases {
if let Ok(s) = resolve(&TimeoutDependencyProvider::new(dependency_provider.clone(), 50_000), name, ver) {
prop_assert!(sat.sat_is_valid_solution(&s));
} else {
prop_assert!(!sat.sat_resolve(&name, &ver));
}
}
}
#[test]
/// This tests whether the algorithm is still deterministic.
fn prop_same_on_repeated_runs(
(dependency_provider, cases) in registry_strategy(0u16..665, 666)
) {
for (name, ver) in cases {
let one = resolve(&TimeoutDependencyProvider::new(dependency_provider.clone(), 50_000), name, ver);
for _ in 0..3 {
match (&one, &resolve(&TimeoutDependencyProvider::new(dependency_provider.clone(), 50_000), name, ver)) {
(Ok(l), Ok(r)) => assert_eq!(l, r),
(Err(PubGrubError::NoSolution(derivation_l)), Err(PubGrubError::NoSolution(derivation_r))) => {
prop_assert_eq!(
DefaultStringReporter::report(&derivation_l).to_string(),
DefaultStringReporter::report(&derivation_r).to_string()
)},
_ => panic!("not the same result")
}
}
}
}
#[test]
/// [ReverseDependencyProvider] changes what order the candidates
/// are tried but not the existence of a solution.
fn prop_reversed_version_errors_the_same(
(dependency_provider, cases) in registry_strategy(0u16..665, 666)
) {
let reverse_provider = ReverseDependencyProvider(dependency_provider.clone());
for (name, ver) in cases {
let l = resolve(&TimeoutDependencyProvider::new(dependency_provider.clone(), 50_000), name, ver);
let r = resolve(&TimeoutDependencyProvider::new(reverse_provider.clone(), 50_000), name, ver);
match (&l, &r) {
(Ok(_), Ok(_)) => (),
(Err(_), Err(_)) => (),
_ => panic!("not the same result")
}
}
}
#[test]
fn prop_removing_a_dep_cant_break(
(dependency_provider, cases) in registry_strategy(0u16..665, 666),
indexes_to_remove in prop::collection::vec((any::<prop::sample::Index>(), any::<prop::sample::Index>(), any::<prop::sample::Index>()), 1..10)
) {
let packages: Vec<_> = dependency_provider.packages().collect();
let mut removed_provider = dependency_provider.clone();
for (package_idx, version_idx, dep_idx) in indexes_to_remove {
let package = package_idx.get(&packages);
let versions = dependency_provider.list_available_versions(package).unwrap();
let version = version_idx.get(&versions);
let dependencys: Vec<_> = dependency_provider.get_dependencies(package, version).unwrap().unwrap().into_iter().collect();
if !dependencys.is_empty() {
let dependency = dep_idx.get(&dependencys).0;
removed_provider.add_dependencies(
**package,
*version,
dependencys.into_iter().filter(|x| x.0 != dependency)
)
}
}
for (name, ver) in cases {
if resolve(&TimeoutDependencyProvider::new(dependency_provider.clone(), 50_000), name, ver).is_ok() {
prop_assert!(
resolve(&TimeoutDependencyProvider::new(removed_provider.clone(), 50_000), name, ver).is_ok(),
"full index worked for `{} = \"={}\"` but removing some deps broke it!",
name,
ver,
)
}
}
}
#[test]
fn prop_limited_independence_of_irrelevant_alternatives(
(dependency_provider, cases) in registry_strategy(0u16..665, 666),
indexes_to_remove in prop::collection::vec(any::<prop::sample::Index>(), 1..10)
) {
let all_versions: Vec<(u16, NumberVersion)> = dependency_provider
.packages()
.flat_map(|&p| {
dependency_provider
.list_available_versions(&p)
.unwrap()
.into_iter()
.map(move |v| (p, v))
})
.collect();
let to_remove: Set<(_, _)> = indexes_to_remove.iter().map(|x| x.get(&all_versions)).cloned().collect();
for (name, ver) in cases {
match resolve(&TimeoutDependencyProvider::new(dependency_provider.clone(), 50_000), name, ver) {
Ok(used) => {
// If resolution was successful, then unpublishing a version of a crate
// that was not selected should not change that.
let mut smaller_dependency_provider = OfflineDependencyProvider::<_, NumberVersion>::new();
for &(n, v) in &all_versions {
if used.get(&n) == Some(&v) // it was used
|| to_remove.get(&(n, v)).is_none() // or it is not one to be removed
{
smaller_dependency_provider.add_dependencies(n, v,
dependency_provider.get_dependencies(&n, &v).unwrap().unwrap()
)
}
}
prop_assert!(
resolve(&TimeoutDependencyProvider::new(smaller_dependency_provider.clone(), 50_000), name, ver).is_ok(),
"unpublishing {:?} stopped `{} = \"={}\"` from working",
to_remove,
name,
ver
)
}
Err(_) => {
// If resolution was unsuccessful, then it should stay unsuccessful
// even if any version of a crate is unpublished.
let mut smaller_dependency_provider = OfflineDependencyProvider::<_, NumberVersion>::new();
for &(n, v) in &all_versions {
if to_remove.get(&(n, v)).is_none() // it is not one to be removed
{
smaller_dependency_provider.add_dependencies(n, v,
dependency_provider.get_dependencies(&n, &v).unwrap().unwrap()
)
}
}
prop_assert!(
resolve(&TimeoutDependencyProvider::new(smaller_dependency_provider.clone(), 50_000), name, ver).is_err(),
"full index did not work for `{} = \"={}\"` but unpublishing {:?} fixed it!",
name,
ver,
to_remove,
)
}
}
}
}
}