Unit test for reading a network from file

test/res/network.txt

@@ -0,0 +1,4 @@
+# idx_agent,n_neighbors_in,indices_neighbors_in[...],weights_in[...]
+0, 2, 2, 1, 0.1, -0.2
+1, 0
+2, 1, 1, 1.2

test/test_io.cpp

@@ -0,0 +1,35 @@
+#include "catch2/matchers/catch_matchers.hpp"
+#include "network.hpp"
+#include "network_generation.hpp"
+
+#include <catch2/catch_test_macros.hpp>
+#include <catch2/matchers/catch_matchers_floating_point.hpp>
+#include <catch2/matchers/catch_matchers_range_equals.hpp>
+
+#include <config_parser.hpp>
+#include <filesystem>
+#include <simulation.hpp>
+namespace fs = std::filesystem;
+
+TEST_CASE( "Test reading in the network from a file", "[io_network]" )
+{
+    using namespace Seldon;
+    using namespace Catch::Matchers;
+
+    auto proj_root_path = fs::current_path();
+    auto network_file   = proj_root_path / fs::path( "test/res/network.txt" );
+
+    auto network = Seldon::generate_from_file( network_file );
+
+    REQUIRE( network->n_agents() == 3 );
+
+    std::vector<std::vector<int>> neighbours_expected           = { { 2, 1 }, {}, { 1 } };
+    std::vector<std::vector<Network::WeightT>> weights_expected = { { 0.1, -0.2 }, {}, { 1.2 } };
+
+    for( int i = 0; i < network->n_agents(); i++ )
+    {
+        fmt::print( "{}", i );
+        REQUIRE_THAT( neighbours_expected[i], Catch::Matchers::UnorderedRangeEquals( network->get_neighbours( i ) ) );
+        REQUIRE_THAT( weights_expected[i], Catch::Matchers::UnorderedRangeEquals( network->get_weights( i ) ) );
+    }
+}