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This PR introduces a new `TEST_CASE` macro called `TEST_CASE_PERSISTENT_FIXTURE`. `TEST_CASE_PERSISTENT_FIXTURE` offers the same functionality as `TEST_CASE_METHOD` except for one difference. The object on which the test method is invoked is only created once for all invocations of the test case. The object is created just after the `testCaseStarting` event is broadcast and the object is destroyed just before the `testCaseEnding` event is broadcast. The main motivation for this new functionality is to allow `TEST_CASE`s to do expensive setup and teardown once per `TEST_CASE`, without having to resort to abusing event listeners or static function variables with manual initialization. Implements #1602 --------- Co-authored-by: Martin Hořeňovský <martin.horenovsky@gmail.com>
132 lines
3.6 KiB
Markdown
132 lines
3.6 KiB
Markdown
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# Other macros
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This page serves as a reference for macros that are not documented
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elsewhere. For now, these macros are separated into 2 rough categories,
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"assertion related macros" and "test case related macros".
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## Assertion related macros
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* `CHECKED_IF` and `CHECKED_ELSE`
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`CHECKED_IF( expr )` is an `if` replacement, that also applies Catch2's
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stringification machinery to the _expr_ and records the result. As with
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`if`, the block after a `CHECKED_IF` is entered only if the expression
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evaluates to `true`. `CHECKED_ELSE( expr )` work similarly, but the block
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is entered only if the _expr_ evaluated to `false`.
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> `CHECKED_X` macros were changed to not count as failure in Catch2 3.0.1.
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Example:
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```cpp
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int a = ...;
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int b = ...;
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CHECKED_IF( a == b ) {
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// This block is entered when a == b
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} CHECKED_ELSE ( a == b ) {
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// This block is entered when a != b
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}
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```
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* `CHECK_NOFAIL`
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`CHECK_NOFAIL( expr )` is a variant of `CHECK` that does not fail the test
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case if _expr_ evaluates to `false`. This can be useful for checking some
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assumption, that might be violated without the test necessarily failing.
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Example output:
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```
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main.cpp:6:
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FAILED - but was ok:
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CHECK_NOFAIL( 1 == 2 )
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main.cpp:7:
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PASSED:
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CHECK( 2 == 2 )
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```
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* `SUCCEED`
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`SUCCEED( msg )` is mostly equivalent with `INFO( msg ); REQUIRE( true );`.
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In other words, `SUCCEED` is for cases where just reaching a certain line
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means that the test has been a success.
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Example usage:
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```cpp
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TEST_CASE( "SUCCEED showcase" ) {
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int I = 1;
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SUCCEED( "I is " << I );
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}
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```
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* `STATIC_REQUIRE` and `STATIC_CHECK`
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> `STATIC_REQUIRE` was [introduced](https://github.com/catchorg/Catch2/issues/1362) in Catch2 2.4.2.
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`STATIC_REQUIRE( expr )` is a macro that can be used the same way as a
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`static_assert`, but also registers the success with Catch2, so it is
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reported as a success at runtime. The whole check can also be deferred
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to the runtime, by defining `CATCH_CONFIG_RUNTIME_STATIC_REQUIRE` before
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including the Catch2 header.
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Example:
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```cpp
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TEST_CASE("STATIC_REQUIRE showcase", "[traits]") {
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STATIC_REQUIRE( std::is_void<void>::value );
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STATIC_REQUIRE_FALSE( std::is_void<int>::value );
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}
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```
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> `STATIC_CHECK` was [introduced](https://github.com/catchorg/Catch2/pull/2318) in Catch2 3.0.1.
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`STATIC_CHECK( expr )` is equivalent to `STATIC_REQUIRE( expr )`, with the
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difference that when `CATCH_CONFIG_RUNTIME_STATIC_REQUIRE` is defined, it
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becomes equivalent to `CHECK` instead of `REQUIRE`.
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Example:
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```cpp
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TEST_CASE("STATIC_CHECK showcase", "[traits]") {
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STATIC_CHECK( std::is_void<void>::value );
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STATIC_CHECK_FALSE( std::is_void<int>::value );
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}
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```
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## Test case related macros
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* `REGISTER_TEST_CASE`
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`REGISTER_TEST_CASE( function, description )` let's you register
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a `function` as a test case. The function has to have `void()` signature,
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the description can contain both name and tags.
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Example:
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```cpp
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REGISTER_TEST_CASE( someFunction, "ManuallyRegistered", "[tags]" );
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```
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_Note that the registration still has to happen before Catch2's session
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is initiated. This means that it either needs to be done in a global
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constructor, or before Catch2's session is created in user's own main._
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* `DYNAMIC_SECTION`
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> Introduced in Catch2 2.3.0.
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`DYNAMIC_SECTION` is a `SECTION` where the user can use `operator<<` to
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create the final name for that section. This can be useful with e.g.
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generators, or when creating a `SECTION` dynamically, within a loop.
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Example:
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```cpp
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TEST_CASE( "looped SECTION tests" ) {
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int a = 1;
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for( int b = 0; b < 10; ++b ) {
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DYNAMIC_SECTION( "b is currently: " << b ) {
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CHECK( b > a );
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}
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}
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}
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```
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