## 0.3.3
Boxing Day Special
### New Additions
- Added support for `i128` and `u128`. Since this is an unstable feature in
Rust, this is hidden behind the feature `unstable` which you have to
explicitly opt into in your `Cargo.toml` file.
- Failing case persistence. By default, when a test fails, Proptest will now
save the seed for the failing test to a file, and later runs will test the
persisted failing cases before generating new ones.
- Added `UniformArrayStrategy` and helper functions to simplify generating
homogeneous arrays with non-`Copy` inner strategies.
- Trait `rand::Rng` and struct `rand::XorShiftRng` are now included in
`proptest::prelude`.
### Bug Fixes
- Fix a case where certain combinations of strategies, like two
`prop_shuffle()`s in close proximity, could result in low-quality randomness.
## 0.3.2
### New Additions
- Added `SampledBitSetStrategy` to generate bit sets based on size
distribution.
- Added `Strategy::sboxed()` and `SBoxedStrategy` to make `Send + Sync` boxed
strategies.
- `RegexGeneratorStrategy` is now `Send` and `Sync`.
- Added a type alias `ValueFor<S>` where `S: Strategy`. This is a shorter way
to refer to: `<<S as Strategy>::Value as ValueTree>::Value`.
- Added a type alias `type W<T> = (u32, T)` for a weighted strategy `T` in the
context of union strategies.
- `TestRunner` now implements `Default`.
- Added `Config::with_cases(number_of_cases: u32) -> Config` for simpler
construction of a `Config` that only differs by the number of test cases.
- All default fields of `Config` can now be overridden by setting environment
variables. See the docs of that struct for more details.
- Bumped dependency `rand = "0.3.18"`.
- Added `proptest::sample::subsequence` which returns a strategy generating
subsequences, of the source `Vec`, with a size within the given `Range`.
- Added `proptest::sample::select` which returns a strategy selecting exactly
one value from another collection.
- Added `prop_perturb` strategy combinator.
- Added `strategy::check_strategy_sanity()` function to do sanity checks on the
shrinking implementation of a strategy.
- Added `prop_shuffle` strategy combinator.
- Added `strategy::Fuse` adaptor.
### Bug Fixes
- Fix bug where `Vec`, array and tuple shrinking could corrupt the state of
their inner values, for example leading to out-of-range integers.
- Fix bug where `Flatten` (a.k.a. the `prop_flat_map` combinator) could fail to
converge to a failing test case during shrinking.
- Fix `TupleUnion` sometimes panicking during shrinking if there were more than
two choices.
## 0.3.1
### New Additions
- Added `CharStrategy::new_borrowed`.
## 0.3.0
### New Additions
- `Union` now supports weighting via `Union::new_weighted`. Corresponding
syntax to specify weights is also available in `prop_oneof!`.
- Added `TupleUnion`, which works like `Union` but permits doing static
dispatch even with heterogeneous delegate strategies.
- `prop_oneof!` is smarter about how it combines the input strategies.
- Added `option` module to generate weighted or unweighted `Option` types.
- Added `result` module to generate weighted or unweighted `Result` types.
- All `bits` submodules now have a `masked` function to create a strategy for
generating subsets of an arbitrary bitmask.
### Potential Breaking Changes
- `Union::new` now has a generic argument type which could impact type
inference.
- The concrete types produced by `prop_oneof!` have changed.
- API functions which used to return `BoxedStrategy` now return a specific
type.
- `BitSetStrategy<T>` is no longer `Copy` for non-`Copy` types `T` nor `Debug`
for non-`Debug` types `T`.
- `BitSetLike::max` has been renamed to `BitSetLike::len`.
## 0.2.1
### New Additions
- Added `prop_assert!` macro family to assert without panicking, for quieter
test failure modes.
- New `prelude` module for easier importing of important things.
- Renamed `Singleton` to `Just`. (The old name is still available.)
- Failure messages produced by `proptest!` are now much more readable.
- Added in-depth tutorial.
## 0.2.0
### Breaking Changes
- `Strategy` now requires `std::fmt::Debug`.
### New Additions
- `Strategy` now has a family of `prop_flat_map()` combinators for producing
dynamic and higher-order strategies.
- `Strategy` has a `prop_recursive()` combinator which allows generating
recursive structures.
- Added `proptest::bool::weighted()` to pull booleans from a weighted
distribution.
- New `prop_oneof!` macro makes it easier to select from one of several
strategies.
- New `prop_compose!` macro to simplify writing most types of custom
strategies.
## 0.1.1
### New Additions
Add `strategy::NoShrink`, `Strategy::no_shrink()`.