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);
	}