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Diffstat (limited to 'contrib/catch2/examples/111-Fix-PersistentFixture.cpp')
| -rw-r--r-- | contrib/catch2/examples/111-Fix-PersistentFixture.cpp | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/contrib/catch2/examples/111-Fix-PersistentFixture.cpp b/contrib/catch2/examples/111-Fix-PersistentFixture.cpp new file mode 100644 index 0000000..2bef90f --- /dev/null +++ b/contrib/catch2/examples/111-Fix-PersistentFixture.cpp @@ -0,0 +1,74 @@ + +// 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) + +// SPDX-License-Identifier: BSL-1.0 + +// Fixture.cpp + +// Catch2 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) + +// main() provided by linkage to Catch2WithMain + +#include <catch2/catch_test_macros.hpp> + +#include <thread> + +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 ) ); + } + + ~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 ) ); + } + + int getInt() const { return 42; } +}; + +struct MyFixture { + + // 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; +}; + +// 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" ) { + + const int val = myInt++; + + SECTION( "First partial run" ) { + const auto otherValue = expensive.getInt(); + REQUIRE( val == 0 ); + REQUIRE( otherValue == 42 ); + } + + SECTION( "Second partial run" ) { REQUIRE( val == 1 ); } +}
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