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// unit tests for gathering and scattering data from a LAMMPS instance through
// the Fortran wrapper
#include "lammps.h"
#include "library.h"
#include <cstdint>
#include <cstdlib>
#include <mpi.h>
#include <string>
#include "gtest/gtest.h"
// prototypes for Fortran reverse wrapper functions
extern "C" {
void *f_lammps_with_args();
void f_lammps_close();
void f_lammps_setup_fix_external_callback();
void f_lammps_setup_fix_external_array();
void f_lammps_set_fix_external_callbacks();
void f_lammps_get_force(int, double *);
void f_lammps_reverse_direction();
void f_lammps_find_forces();
void f_lammps_add_energy();
void f_lammps_set_virial();
double f_lammps_find_peratom_energy(int);
void f_lammps_find_peratom_virial(double[6], int);
void f_lammps_fixexternal_set_vector();
}
using namespace LAMMPS_NS;
class LAMMPS_fixexternal : public ::testing::Test {
protected:
LAMMPS_NS::LAMMPS *lmp;
LAMMPS_fixexternal() = default;
~LAMMPS_fixexternal() override = default;
void SetUp() override
{
::testing::internal::CaptureStdout();
lmp = (LAMMPS_NS::LAMMPS *)f_lammps_with_args();
std::string output = ::testing::internal::GetCapturedStdout();
EXPECT_STREQ(output.substr(0, 8).c_str(), "LAMMPS (");
}
void TearDown() override
{
::testing::internal::CaptureStdout();
f_lammps_close();
std::string output = ::testing::internal::GetCapturedStdout();
EXPECT_STREQ(output.substr(0, 16).c_str(), "Total wall time:");
lmp = nullptr;
}
};
TEST_F(LAMMPS_fixexternal, callback)
{
f_lammps_setup_fix_external_callback();
f_lammps_set_fix_external_callbacks();
lammps_command(lmp, "run 0");
double f[3];
f_lammps_get_force(1, f);
EXPECT_DOUBLE_EQ(f[0], 3.0);
EXPECT_DOUBLE_EQ(f[1], -3.0);
EXPECT_DOUBLE_EQ(f[2], 3.75);
f_lammps_get_force(2, f);
EXPECT_DOUBLE_EQ(f[0], -3.0);
EXPECT_DOUBLE_EQ(f[1], 3.0);
EXPECT_DOUBLE_EQ(f[2], -3.75);
f_lammps_reverse_direction();
f_lammps_set_fix_external_callbacks();
lammps_command(lmp, "run 0");
f_lammps_get_force(1, f);
EXPECT_DOUBLE_EQ(f[0], -1.0);
EXPECT_DOUBLE_EQ(f[1], 1.0);
EXPECT_DOUBLE_EQ(f[2], -1.25);
f_lammps_get_force(2, f);
EXPECT_DOUBLE_EQ(f[0], 1.0);
EXPECT_DOUBLE_EQ(f[1], -1.0);
EXPECT_DOUBLE_EQ(f[2], 1.25);
};
TEST_F(LAMMPS_fixexternal, array)
{
f_lammps_setup_fix_external_array();
double **f;
f = (double **)lammps_extract_atom(lmp, "f");
f_lammps_find_forces();
lammps_command(lmp, "run 0");
EXPECT_DOUBLE_EQ(f[0][0], 14.0);
EXPECT_DOUBLE_EQ(f[0][1], -14.0);
EXPECT_DOUBLE_EQ(f[0][2], 18.0);
EXPECT_DOUBLE_EQ(f[1][0], 16.0);
EXPECT_DOUBLE_EQ(f[1][1], -16.0);
EXPECT_DOUBLE_EQ(f[1][2], 20.0);
};
TEST_F(LAMMPS_fixexternal, energy_global)
{
f_lammps_setup_fix_external_array();
double energy;
f_lammps_add_energy();
lammps_command(lmp, "run 0");
energy = lammps_get_thermo(lmp, "etotal");
EXPECT_DOUBLE_EQ(energy, -20.2);
};
TEST_F(LAMMPS_fixexternal, virial_global)
{
f_lammps_setup_fix_external_array();
double virial[6], volume;
f_lammps_set_virial();
lammps_command(lmp, "run 0");
volume = lammps_get_thermo(lmp, "vol");
virial[0] = lammps_get_thermo(lmp, "pxx");
virial[1] = lammps_get_thermo(lmp, "pyy");
virial[2] = lammps_get_thermo(lmp, "pzz");
virial[3] = lammps_get_thermo(lmp, "pxy");
virial[4] = lammps_get_thermo(lmp, "pxz");
virial[5] = lammps_get_thermo(lmp, "pyz");
EXPECT_DOUBLE_EQ(virial[0], 1.0 / volume);
EXPECT_DOUBLE_EQ(virial[1], 2.0 / volume);
EXPECT_DOUBLE_EQ(virial[2], 2.5 / volume);
EXPECT_DOUBLE_EQ(virial[3], -1.0 / volume);
EXPECT_DOUBLE_EQ(virial[4], -2.25 / volume);
EXPECT_DOUBLE_EQ(virial[5], -3.02 / volume);
};
TEST_F(LAMMPS_fixexternal, energy_peratom)
{
f_lammps_setup_fix_external_callback();
f_lammps_set_fix_external_callbacks();
lammps_command(lmp, "compute peratom all pe/atom");
double energy;
lammps_command(lmp, "run 0");
int nlocal = lammps_extract_setting(lmp, "nlocal");
for (int i = 1; i <= nlocal; i++) {
energy = f_lammps_find_peratom_energy(i);
if (i == 1)
EXPECT_DOUBLE_EQ(energy, 1.0);
else
EXPECT_DOUBLE_EQ(energy, 10.0);
}
};
TEST_F(LAMMPS_fixexternal, virial_peratom)
{
f_lammps_setup_fix_external_callback();
f_lammps_set_fix_external_callbacks();
lammps_command(lmp, "compute vperatom all stress/atom NULL");
double virial[6];
lammps_command(lmp, "run 0");
int nlocal = lammps_extract_setting(lmp, "nlocal");
for (int i = 1; i <= nlocal; i++) {
f_lammps_find_peratom_virial(virial, i);
if (i == 1) {
EXPECT_DOUBLE_EQ(virial[0], -1.0);
EXPECT_DOUBLE_EQ(virial[1], -2.0);
EXPECT_DOUBLE_EQ(virial[2], 1.0);
EXPECT_DOUBLE_EQ(virial[3], 2.0);
EXPECT_DOUBLE_EQ(virial[4], -3.0);
EXPECT_DOUBLE_EQ(virial[5], 3.0);
} else {
EXPECT_DOUBLE_EQ(virial[0], -10.0);
EXPECT_DOUBLE_EQ(virial[1], -20.0);
EXPECT_DOUBLE_EQ(virial[2], 10.0);
EXPECT_DOUBLE_EQ(virial[3], 20.0);
EXPECT_DOUBLE_EQ(virial[4], -30.0);
EXPECT_DOUBLE_EQ(virial[5], 30.0);
}
}
};
TEST_F(LAMMPS_fixexternal, vector)
{
f_lammps_setup_fix_external_callback();
f_lammps_set_fix_external_callbacks();
f_lammps_fixexternal_set_vector();
lammps_command(lmp, "run 0");
double *v;
for (int i = 0; i < 8; i++) {
v = (double *)lammps_extract_fix(lmp, "ext2", LMP_STYLE_GLOBAL, LMP_TYPE_VECTOR, i, 1);
EXPECT_DOUBLE_EQ(i + 1, *v);
std::free(v);
}
};
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