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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)
+
+// 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 ); }
+} \ No newline at end of file