apply consistent naming scheme for tester source files and executables

unittest/fortran/wrap_commands.cpp

@@ -0,0 +1,65 @@
+// unit tests for issuing command to a LAMMPS instance through the Fortran wrapper
+
+#include "lammps.h"
+#include <mpi.h>
+#include <cstdio>  // for stdin, stdout
+#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_file();
+    void f_lammps_command();
+    void f_lammps_commands_list();
+    void f_lammps_commands_string();
+    double f_lammps_get_natoms();
+}
+
+class LAMMPS_commands : public ::testing::Test
+{
+protected:
+    LAMMPS_NS::LAMMPS *lmp;
+    LAMMPS_commands() {};
+    ~LAMMPS_commands() override {};
+
+    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_commands, from_file) {
+    EXPECT_EQ(f_lammps_get_natoms(),0);
+    f_lammps_file();
+    EXPECT_EQ(f_lammps_get_natoms(),2);
+};
+
+TEST_F(LAMMPS_commands, from_line) {
+    EXPECT_EQ(f_lammps_get_natoms(),0);
+    f_lammps_command();
+    EXPECT_EQ(f_lammps_get_natoms(),1);
+};
+
+TEST_F(LAMMPS_commands, from_list) {
+    EXPECT_EQ(f_lammps_get_natoms(),0);
+    f_lammps_commands_list();
+    EXPECT_EQ(f_lammps_get_natoms(),2);
+};
+
+TEST_F(LAMMPS_commands, from_string) {
+    EXPECT_EQ(f_lammps_get_natoms(),0);
+    f_lammps_commands_string();
+    EXPECT_EQ(f_lammps_get_natoms(),2);
+};