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Fix the license on the file Improve the example to make the use cases much clearer. Also fix up the documentation
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// Copyright Catch2 Authors | ||
// Distributed under the Boost Software License, Version 1.0. | ||
// (See accompanying file LICENSE.txt or copy at | ||
// https://www.boost.org/LICENSE_1_0.txt) | ||
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// SPDX-License-Identifier: BSL-1.0 | ||
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// Fixture.cpp | ||
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// Catch has three ways to express fixtures: | ||
// - Sections | ||
// - Traditional class-based fixtures that are created and destroyed on every | ||
// partial run | ||
// - Traditional class-based fixtures that are created at the start of a test | ||
// case and destroyed at the end of a test case (this file) | ||
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// main() provided by linkage to Catch2WithMain | ||
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#include <catch2/catch_test_macros.hpp> | ||
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#include <thread> | ||
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class ClassWithExpensiveSetup { | ||
public: | ||
ClassWithExpensiveSetup() { | ||
// Imagine some really expensive set up here. | ||
// e.g. | ||
// setting up a D3D12/Vulkan Device, | ||
// connecting to a database, | ||
// loading a file | ||
// etc etc etc | ||
std::this_thread::sleep_for( std::chrono::seconds( 2 ) ); | ||
} | ||
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~ClassWithExpensiveSetup() noexcept { | ||
// We can do any clean up of the expensive class in the destructor | ||
// e.g. | ||
// destroy D3D12/Vulkan Device, | ||
// disconnecting from a database, | ||
// release file handle | ||
// etc etc etc | ||
std::this_thread::sleep_for( std::chrono::seconds( 1 ) ); | ||
} | ||
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int getInt() const { return 42; } | ||
}; | ||
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struct MyFixture { | ||
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// The test case member function is const. | ||
// Therefore we need to mark any member of the fixture | ||
// that needs to mutate as mutable. | ||
mutable int myInt = 0; | ||
ClassWithExpensiveSetup expensive; | ||
}; | ||
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// Only one object of type MyFixture will be instantiated for the run | ||
// of this test case even though there are two leaf sections. | ||
// This is useful if your test case requires an object that is | ||
// expensive to create and could be reused for each partial run of the | ||
// test case. | ||
TEST_CASE_PERSISTENT_FIXTURE( MyFixture, "Tests with MyFixture" ) { | ||
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const int val = myInt++; | ||
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SECTION( "First partial run" ) { | ||
const auto otherValue = expensive.getInt(); | ||
REQUIRE( val == 0 ); | ||
REQUIRE( otherValue == 42 ); | ||
} | ||
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SECTION( "Second partial run" ) { REQUIRE( val == 1 ); } | ||
} |
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