mirror of https://github.com/catchorg/Catch2.git
156 lines
4.1 KiB
Markdown
156 lines
4.1 KiB
Markdown
<a id="top"></a>
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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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* `METHOD_AS_TEST_CASE`
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`METHOD_AS_TEST_CASE( member-function-pointer, description )` lets you
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register a member function of a class as a Catch2 test case. The class
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will be separately instantiated for each method registered in this way.
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```cpp
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class TestClass {
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std::string s;
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public:
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TestClass()
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:s( "hello" )
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{}
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void testCase() {
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REQUIRE( s == "hello" );
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}
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};
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METHOD_AS_TEST_CASE( TestClass::testCase, "Use class's method as a test case", "[class]" )
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```
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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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