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New and hopefully improved documentation for matchers
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docs/matchers.md
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docs/matchers.md
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<a id="top"></a>
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# Matchers
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Matchers are an alternative way to do assertions which are easily extensible and composable.
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This makes them well suited to use with more complex types (such as collections) or your own custom types.
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Matchers were first popularised by the [Hamcrest](https://en.wikipedia.org/wiki/Hamcrest) family of frameworks.
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**Contents**<br>
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[Using Matchers](#using-matchers)<br>
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[Built-in matchers](#built-in-matchers)<br>
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[Writing custom matchers (old style)](#writing-custom-matchers-old-style)<br>
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[Writing custom matchers (new style)](#writing-custom-matchers-new-style)<br>
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## In use
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Matchers, as popularized by the [Hamcrest](https://en.wikipedia.org/wiki/Hamcrest)
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framework are an alternative way to write assertions, useful for tests
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where you work with complex types or need to assert more complex
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properties. Matchers are easily composable and users can write their
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own and combine them with the Catch2-provided matchers seamlessly.
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Matchers are introduced with the `REQUIRE_THAT` or `CHECK_THAT` macros, which take two arguments.
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The first argument is the thing (object or value) under test. The second part is a match _expression_,
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which consists of either a single matcher or one or more matchers combined using `&&`, `||` or `!` operators.
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For example, to assert that a string ends with a certain substring:
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## Using Matchers
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```c++
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using Catch::Matchers::EndsWith; // or Catch::EndsWith
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std::string str = getStringFromSomewhere();
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REQUIRE_THAT( str, EndsWith( "as a service" ) );
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```
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Matchers are most commonly used in tandem with the `REQUIRE_THAT` or
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`CHECK_THAT` macros. The `REQUIRE_THAT` macro takes two arguments,
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the first one is the input (object/value) to test, the second argument
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is the matcher itself.
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The matcher objects can take multiple arguments, allowing more fine tuning.
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The built-in string matchers, for example, take a second argument specifying whether the comparison is
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case sensitive or not:
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```c++
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REQUIRE_THAT( str, EndsWith( "as a service", Catch::CaseSensitive::No ) );
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```
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And matchers can be combined:
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```c++
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REQUIRE_THAT( str,
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EndsWith( "as a service" ) ||
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(StartsWith( "Big data" ) && !Contains( "web scale" ) ) );
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```
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_The combining operators do not take ownership of the matcher objects.
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This means that if you store the combined object, you have to ensure that
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the matcher objects outlive its last use. What this means is that code
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like this leads to a use-after-free and (hopefully) a crash:_
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For example, to assert that a string ends with the "as a service"
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substring, you can write the following assertion
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```cpp
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using Catch::Matchers::EndsWith;
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REQUIRE_THAT( getSomeString(), EndsWith("as a service") );
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```
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Individual matchers can also be combined using the C++ logical
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operators, that is `&&`, `||`, and `!`, like so:
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```cpp
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using Catch::Matchers::EndsWith;
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using Catch::Matchers::Contains;
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REQUIRE_THAT( getSomeString(),
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EndsWith("as a service") && Contains("web scale"));
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```
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The example above asserts that the string returned from `getSomeString`
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_both_ ends with the suffix "as a service" _and_ contains the string
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"web scale" somewhere.
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Both of the string matchers used in the examples above live in the
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`catch_matchers_string.h` header, so to compile the code above also
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requires `#include <catch2/matchers/catch_matchers_string.h>`.
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**IMPORTANT**: The combining operators do not take ownership of the
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matcher objects being combined. This means that if you store combined
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matcher object, you have to ensure that the matchers being combined
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outlive its last use. What this means is that the following code leads
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to a use-after-free (UAF):
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```cpp
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#include <catch2/catch_test_macros.hpp>
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#include <catch2/matchers/catch_matchers_string.h>
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TEST_CASE("Bugs, bugs, bugs", "[Bug]"){
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std::string str = "Bugs as a service";
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auto match_expression = Catch::EndsWith( "as a service" ) ||
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(Catch::StartsWith( "Big data" ) && !Catch::Contains( "web scale" ) );
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auto match_expression = Catch::Matchers::EndsWith( "as a service" ) ||
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(Catch::Matchers::StartsWith( "Big data" ) && !Catch::Matchers::Contains( "web scale" ) );
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REQUIRE_THAT(str, match_expression);
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}
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```
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## Built in matchers
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Catch2 provides some matchers by default. They can be found in the
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`Catch::Matchers::foo` namespace and are imported into the `Catch`
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namespace as well.
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## Built-in matchers
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There are two parts to each of the built-in matchers, the matcher
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type itself and a helper function that provides template argument
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deduction when creating templated matchers. As an example, the matcher
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for checking that two instances of `std::vector` are identical is
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`EqualsMatcher<T>`, but the user is expected to use the `Equals`
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helper function instead.
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Every matcher provided by Catch2 is split into 2 parts, a factory
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function that lives in the `Catch::Matchers` namespace, and the actual
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matcher type that is in some deeper namespace and should not be used by
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the user. In the examples above, we used `Catch::Matchers::Contains`.
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This is the factory function for the
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`Catch::Matchers::StdString::ContainsMatcher` type that does the actual
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matching.
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Out of the box, Catch2 provides the following matchers:
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### String matchers
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The string matchers are `StartsWith`, `EndsWith`, `Contains`, `Equals` and `Matches`. The first four match a literal (sub)string against a result, while `Matches` takes and matches an ECMAScript regex. Do note that `Matches` matches the string as a whole, meaning that "abc" will not match against "abcd", but "abc.*" will.
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### `std::string` matchers
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Each of the provided `std::string` matchers also takes an optional second argument, that decides case sensitivity (by-default, they are case sensitive).
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Catch2 provides 5 different matchers that work with `std::string`,
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* `StartsWith(std::string str, CaseSensitive)`,
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* `EndsWith(std::string str, CaseSensitive)`,
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* `Contains(std::string str, CaseSensitive)`,
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* `Equals(std::string str, CaseSensitive)`, and
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* `Matches(std::string str, CaseSensitive)`.
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The first three should be fairly self-explanatory, they succeed if
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the argument starts with `str`, ends with `str`, or contains `str`
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somewhere inside it.
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The `Equals` matcher matches a string if (and only if) the argument
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string is equal to `str`.
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Finally, the `Matches` matcher performs an ECMASCript regex match using
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`str` against the argument string. It is important to know that
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the match is performed agains the string as a whole, meaning that
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the regex `"abc"` will not match input string `"abcd"`. To match
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`"abcd"`, you need to use e.g. `"abc.*"` as your regex.
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The second argument sets whether the matching should be case-sensitive
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or not. By default, it is case-sensitive.
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> `std::string` matchers live in `catch2/matchers/catch_matchers_string.h`
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### Vector matchers
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Catch2 currently provides 5 built-in matchers that work on `std::vector`.
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_Vector matchers have been deprecated in favour of the generic
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range matchers with the same functionality._
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Catch2 provides 5 built-in matchers that work on `std::vector`.
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These are
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* `Contains` which checks whether a specified vector is present in the result
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@ -81,40 +127,82 @@ These are
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* `Approx` which checks whether the result is "approx-equal" (order matters, but comparison is done via `Approx`) to a specific vector
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> Approx matcher was [introduced](https://github.com/catchorg/Catch2/issues/1499) in Catch 2.7.2.
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An example usage:
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```cpp
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std::vector<int> some_vec{ 1, 2, 3 };
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REQUIRE_THAT(some_vec, Catch::Matchers::UnorderedEquals(std::vector<int>{ 3, 2, 1 }));
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```
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This assertions will pass, because the elements given to the matchers
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are a permutation of the ones in `some_vec`.
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> vector matchers live in `catch2/matchers/catch_matchers_vector.h`
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### Floating point matchers
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Catch2 provides 3 matchers for working with floating point numbers. These
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are `WithinAbsMatcher`, `WithinUlpsMatcher` and `WithinRelMatcher`.
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The `WithinAbsMatcher` matcher accepts floating point numbers that are
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within a certain distance of target. It should be constructed with the
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`WithinAbs(double target, double margin)` helper.
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Catch2 provides 3 matchers that target floating point numbers. These
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are:
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The `WithinUlpsMatcher` matcher accepts floating point numbers that are
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within a certain number of [ULPs](https://en.wikipedia.org/wiki/Unit_in_the_last_place)
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of the target. Because ULP comparisons need to be done differently for
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`float`s and for `double`s, there are two overloads of the helpers for
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this matcher, `WithinULP(float target, int64_t ULPs)`, and
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`WithinULP(double target, int64_t ULPs)`.
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The `WithinRelMatcher` matcher accepts floating point numbers that are
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_approximately equal_ with the target number with some specific tolerance.
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In other words, it checks that `|lhs - rhs| <= epsilon * max(|lhs|, |rhs|)`,
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with special casing for `INFINITY` and `NaN`. There are _4_ overloads of
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the helpers for this matcher, `WithinRel(double target, double margin)`,
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`WithinRel(float target, float margin)`, `WithinRel(double target)`, and
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`WithinRel(float target)`. The latter two provide a default epsilon of
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machine epsilon * 100.
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* `WithinAbs(double target, double margin)`,
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* `WithinUlps(FloatingPoint target, uint64_t maxUlpDiff)`, and
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* `WithinRel(FloatingPoint target, FloatingPoint eps)`.
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> `WithinRel` matcher was introduced in Catch 2.10.0
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### Generic matchers
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Catch also aims to provide a set of generic matchers. Currently this set
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contains only a matcher that takes arbitrary callable predicate and applies
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it onto the provided object.
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Because of type inference limitations, the argument type of the predicate
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has to be provided explicitly. Example:
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`WithinAbs` creates a matcher that accepts floating point numbers whose
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difference with `target` is less than the `margin`.
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`WithinULP` creates a matcher that accepts floating point numbers that
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are no more than `maxUlpDiff`
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[ULPs](https://en.wikipedia.org/wiki/Unit_in_the_last_place)
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away from the `target` value. The short version of what this means
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is that there is no more than `maxUlpDiff - 1` representeable floating
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point numbers between the argument for matching and the `target` value.
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`WithinRel` creates a matcher that accepts floating point numbers that
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are _approximately equal_ with the `target` with tolerance of `eps.`
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Specifically, it matches if
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`|arg - target| <= eps * max(|arg|, |target|)` holds. If you do not
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specify `eps`, `std::numeric_limits<FloatingPoint>::epsilon * 100`
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is used as the default.
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In practice, you will often want to combine multiple of these matchers,
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together for an assertion, because all 3 options have edge cases where
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they behave differently than you would expect. As an example, under
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the `WithinRel` matcher, a `0.` only ever matches a `0.` (or `-0.`),
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regardless of the relative tolerance specified. Thus, if you want to
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handle numbers that are "close enough to 0 to be 0", you have to combine
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it with the `WithinAbs` matcher.
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For example, to check that our computation matches known good value
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within 0.1%, or is close enough (no different to 5 decimal places)
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to zero, we would write this assertion:
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```cpp
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REQUIRE_THAT( computation(input),
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Catch::Matchers::WithinRel(expected, 0.001)
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|| Catch::Matchers::WithinAbs(0, 0.000001) );
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```
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> floating point matchers live in `catch2/matchers/catch_matchers_floating.h`
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### Miscellaneous matchers
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Catch2 also provides some matchers and matcher utilities that do not
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quite fit into other categories.
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The first one of them is the `Predicate(Callable pred, std::string description)`
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matcher. It creates a matcher object that calls `pred` for the provided
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argument. The `description` argument allows users to set what the
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resulting matcher should self-describe as if required.
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Do note that you will need to explicitly specify the type of the
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argument, like in this example:
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```cpp
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REQUIRE_THAT("Hello olleH",
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Predicate<std::string>(
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@ -123,84 +211,175 @@ REQUIRE_THAT("Hello olleH",
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);
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```
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The second argument is an optional description of the predicate, and is
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used only during reporting of the result.
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> the predicate matcher lives in `catch2/matchers/catch_matchers_generic.hpp`
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### Exception matchers
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Catch2 also provides an exception matcher that can be used to verify
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that an exception's message exactly matches desired string. The matcher
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is `ExceptionMessageMatcher`, and we also provide a helper function
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`Message`.
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The other miscellaneous matcher utility is exception matching.
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The matched exception must publicly derive from `std::exception` and
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the message matching is done _exactly_, including case.
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> `ExceptionMessageMatcher` was introduced in Catch 2.10.0
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#### Matching exceptions
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Catch2 provides an utility macro for asserting that an expression
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throws exception of specific type, and that the exception has desired
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properties. The macro is `REQUIRE_THROWS_MATCHES(expr, ExceptionType, Matcher)`.
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> `REQUIRE_THROWS_MATCHES` macro lives in `catch2/matchers/catch_matchers.h`
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Catch2 currently provides only one matcher for exceptions,
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`Message(std::string message)`. `Message` checks that the exception's
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message, as returned from `what` is exactly equal to `message`.
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Example use:
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```cpp
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REQUIRE_THROWS_MATCHES(throwsDerivedException(), DerivedException, Message("DerivedException::what"));
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```
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## Custom matchers
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It's easy to provide your own matchers to extend Catch or just to work with your own types.
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Note that `DerivedException` in the example above has to derive from
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`std::exception` for the example to work.
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You need to provide two things:
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1. A matcher class, derived from `Catch::MatcherBase<T>` - where `T` is the type being tested.
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The constructor takes and stores any arguments needed (e.g. something to compare against) and you must
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override two methods: `match()` and `describe()`.
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2. A simple builder function. This is what is actually called from the test code and allows overloading.
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> the exception message matcher lives in `catch2/matchers/catch_matchers_exception.hpp`
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Here's an example for asserting that an integer falls within a given range
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(note that it is all inline for the sake of keeping the example short):
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## Writing custom matchers (old style)
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The old style of writing matchers has been introduced back in Catch
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Classic. To create an old-style matcher, you have to create your own
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type that derives from `Catch::Matchers::MatcherBase<ArgT>`, where
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`ArgT` is the type your matcher works for. Your type has to override
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two methods, `bool match(ArgT const&) const`,
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and `std::string describe() const`.
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As the name suggests, `match` decides whether the provided argument
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is matched (accepted) by the matcher. `describe` then provides a
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human-oriented description of what the matcher does.
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We also recommend that you create factory function, just like Catch2
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does, but that is mostly useful for template argument deduction for
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templated matchers (assuming you do not have CTAD available).
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To combine these into an example, let's say that you want to write
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a matcher that decides whether the provided argument is a number
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within certain range. We will call it `IsBetweenMatcher<T>`:
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```c++
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// The matcher class
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class IntRange : public Catch::MatcherBase<int> {
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int m_begin, m_end;
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public:
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IntRange( int begin, int end ) : m_begin( begin ), m_end( end ) {}
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#include <catch2/catch_test_macros.hpp>
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#include <catch2/matchers/catch_matchers.h>
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// ...
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// Performs the test for this matcher
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bool match( int const& i ) const override {
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return i >= m_begin && i <= m_end;
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template <typename T>
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class IsBetweenMatcher : public Catch::Matchers::MatcherBase<T> {
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T m_begin, m_end;
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public:
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IsBetweenMatcher(T begin, T end) : m_begin(begin), m_end(end) {}
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bool match(T const& in) const override {
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return in >= m_begin && in <= m_end;
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}
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// Produces a string describing what this matcher does. It should
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// include any provided data (the begin/ end in this case) and
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// be written as if it were stating a fact (in the output it will be
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// preceded by the value under test).
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virtual std::string describe() const override {
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std::string describe() const override {
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std::ostringstream ss;
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ss << "is between " << m_begin << " and " << m_end;
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return ss.str();
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}
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};
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// The builder function
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inline IntRange IsBetween( int begin, int end ) {
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return IntRange( begin, end );
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template <typename T>
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IsBetweenMatcher<T> IsBetween(T begin, T end) {
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return { begin, end };
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}
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// ...
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// Usage
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TEST_CASE("Integers are within a range")
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{
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CHECK_THAT( 3, IsBetween( 1, 10 ) );
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CHECK_THAT( 100, IsBetween( 1, 10 ) );
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TEST_CASE("Numbers are within range") {
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// infers `double` for the argument type of the matcher
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CHECK_THAT(3., IsBetween(1., 10.));
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// infers `int` for the argument type of the matcher
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CHECK_THAT(100, IsBetween(1, 10));
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}
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```
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Running this test gives the following in the console:
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Obviously, the code above can be improved somewhat, for example you
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might want to `static_assert` over the fact that `T` is an arithmetic
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type... or generalize the matcher to cover any type for which the user
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can provide a comparison function object.
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Note that while any matcher written using the old style can also be
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written using the new style, combining old style matchers should
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generally compile faster. Also note that you can combine old and new
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style matchers arbitrarily.
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||||
> `MatcherBase` lives in `catch2/matchers/catch_matchers.h`
|
||||
|
||||
|
||||
## Writing custom matchers (new style)
|
||||
|
||||
The new style of writing matchers has been introduced in Catch2 v3.
|
||||
To create a new-style matcher, you have to create your own type that
|
||||
derives from `Catch::Matchers::MatcherGenericBase`. Your type has to
|
||||
also provide two methods, `bool match( ... ) const` and overriden
|
||||
`std::string describe() const`.
|
||||
|
||||
Unlike with old-style matchers, there are no requirements on how
|
||||
the `match` member function takes its argument. This means that the
|
||||
argument can be taken by value or by mutating reference, but also that
|
||||
the matcher's `match` member function can be templated.
|
||||
|
||||
This allows you to write more complex matcher, such as a matcher that
|
||||
can compare one range-like (something that responds to `begin` and
|
||||
`end`) object to another, like in the following example:
|
||||
|
||||
```cpp
|
||||
#include <catch2/catch_test_macros.hpp>
|
||||
#include <catch2/matchers/catch_matchers_templates.hpp>
|
||||
// ...
|
||||
|
||||
template<typename Range>
|
||||
struct EqualsRangeMatcher : Catch::Matchers::MatcherGenericBase {
|
||||
EqualsRangeMatcher(Range const& range):
|
||||
range{ range }
|
||||
{}
|
||||
|
||||
template<typename OtherRange>
|
||||
bool match(OtherRange const& other) const {
|
||||
using std::begin; using std::end;
|
||||
|
||||
return std::equal(begin(range), end(range), begin(other), end(other));
|
||||
}
|
||||
|
||||
std::string describe() const override {
|
||||
return "Equals: " + Catch::rangeToString(range);
|
||||
}
|
||||
|
||||
private:
|
||||
Range const& range;
|
||||
};
|
||||
|
||||
template<typename Range>
|
||||
auto EqualsRange(const Range& range) -> EqualsRangeMatcher<Range> {
|
||||
return EqualsRangeMatcher<Range>{range};
|
||||
}
|
||||
|
||||
TEST_CASE("Combining templated matchers", "[matchers][templated]") {
|
||||
std::array<int, 3> container{{ 1,2,3 }};
|
||||
|
||||
std::array<int, 3> a{{ 1,2,3 }};
|
||||
std::vector<int> b{ 0,1,2 };
|
||||
std::list<int> c{ 4,5,6 };
|
||||
|
||||
REQUIRE_THAT(container, EqualsRange(a) || EqualsRange(b) || EqualsRange(c));
|
||||
}
|
||||
```
|
||||
/**/TestFile.cpp:123: FAILED:
|
||||
CHECK_THAT( 100, IsBetween( 1, 10 ) )
|
||||
with expansion:
|
||||
100 is between 1 and 10
|
||||
```
|
||||
|
||||
Do note that while you can rewrite any matcher from the old style to
|
||||
a new style matcher, combining new style matchers is more expensive
|
||||
in terms of compilation time. Also note that you can combine old style
|
||||
and new style matchers arbitrarily.
|
||||
|
||||
> `MatcherGenericBase` lives in `catch2/matchers/catch_matchers_templates.hpp`
|
||||
|
||||
|
||||
---
|
||||
|
||||
|
@ -61,6 +61,13 @@
|
||||
* `ListeningReporter` is now final
|
||||
|
||||
|
||||
|
||||
### Improvements
|
||||
* Matchers have been extended with the ability to use different signatures of `match` (#1307, #1553, #1554, #1843)
|
||||
* This includes having templated `match` member function
|
||||
* See the [rewritten Matchers documentation](matchers.md#top) for details
|
||||
|
||||
|
||||
### Fixes
|
||||
* The `INFO` macro no longer contains superfluous semicolon (#1456)
|
||||
* The `--list*` family of command line flags now return 0 on success (#1410, #1146)
|
||||
|
Loading…
Reference in New Issue
Block a user