use same main() function as with c-library interface.

unittest/fortran/test_main.cpp

@@ -0,0 +1,60 @@
+/* ----------------------------------------------------------------------
+   LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
+   https://www.lammps.org/, Sandia National Laboratories
+   LAMMPS Development team: developers@lammps.org
+
+   Copyright (2003) Sandia Corporation.  Under the terms of Contract
+   DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
+   certain rights in this software.  This software is distributed under
+   the GNU General Public License.
+
+   See the README file in the top-level LAMMPS directory.
+------------------------------------------------------------------------- */
+
+#include "test_main.h"
+#include "pointers.h"
+#include "utils.h"
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+#include <iostream>
+#include <mpi.h>
+
+// whether to print verbose output (i.e. not capturing LAMMPS screen output).
+bool verbose = false;
+
+int main(int argc, char **argv)
+{
+    MPI_Init(&argc, &argv);
+    ::testing::InitGoogleMock(&argc, argv);
+
+    if (argc < 1) {
+        return 1;
+    }
+
+    // handle arguments passed via environment variable
+    if (const char *var = getenv("TEST_ARGS")) {
+        std::vector<std::string> env = LAMMPS_NS::utils::split_words(var);
+        for (auto arg : env) {
+            if (arg == "-v") {
+                verbose = true;
+            }
+        }
+    }
+
+    int iarg = 1;
+    while (iarg < argc) {
+        if (strcmp(argv[iarg], "-v") == 0) {
+            verbose = true;
+            ++iarg;
+        } else {
+            std::cerr << "unknown option: " << argv[iarg] << "\n\n";
+            MPI_Finalize();
+            return 1;
+        }
+    }
+
+    int rv = RUN_ALL_TESTS();
+    MPI_Finalize();
+    return rv;
+}