fixture_test.cc
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			#include <algorithm>
			#include <cmath>
			#include <exception>
			#include <gtest/gtest.h>
			#include <numeric>
			#include <vector>

			struct Particle {

			double position[3];
			double velocity[3];
			double force[3];
			};

			struct System {
			std::vector<Particle> particles;
			};

			// Fixture class
			class SystemTest : public ::testing::Test {
			protected:
			void SetUp() override {
			// push 10 particles
			system.particles.resize(10);
			}

			void TearDown() override {
			// clear particles
			system.particles.clear();
			}
			System system;
			};

			// Fixture test
			TEST_F(SystemTest, IsNotEmpty) {
			// check the size of container
			EXPECT_EQ(system.particles.size(), 10);
			}

R7571/lectures/code_snippets/fixture_test.ccd4cfcd7d13c3w12ex2_FR