test(network): added approx8 network tests

tests/network/approx8Test.cpp

@@ -0,0 +1,50 @@
+#include <gtest/gtest.h>
+#include <string>
+
+#include "approx8.h"
+#include "config.h"
+#include "network.h"
+
+#include <vector>
+
+std::string TEST_CONFIG = std::string(getenv("MESON_SOURCE_ROOT")) + "/tests/testsConfig.yaml";
+class approx8Test : public ::testing::Test {};
+
+/**
+ * @brief Test the constructor of the Config class.
+ */
+TEST_F(approx8Test, constructor) {
+    Config& config = Config::getInstance();
+    config.loadConfig(TEST_CONFIG);
+    EXPECT_NO_THROW(nnApprox8::Approx8Network());
+}
+
+TEST_F(approx8Test, setStiff) {
+    nnApprox8::Approx8Network network;
+    EXPECT_NO_THROW(network.setStiff(true));
+    EXPECT_TRUE(network.isStiff());
+    EXPECT_NO_THROW(network.setStiff(false));
+    EXPECT_FALSE(network.isStiff());
+}
+
+TEST_F(approx8Test, evaluate) {
+    nnApprox8::Approx8Network network;
+    nuclearNetwork::NetIn netIn;
+    
+    std::vector<double> comp = {0.708, 2.94e-5, 0.276, 0.003, 0.0011, 9.62e-3, 1.62e-3, 5.16e-4};
+
+    netIn.composition = comp;
+    netIn.temperature = 1e7;
+    netIn.density = 1e2;
+    netIn.energy = 0.0;
+    
+    netIn.tmax = 3.15e17;
+    netIn.dt0 = 1e12;
+
+    nuclearNetwork::NetOut netOut;
+    EXPECT_NO_THROW(netOut = network.evaluate(netIn));
+
+    EXPECT_DOUBLE_EQ(netOut.composition[nnApprox8::Net::ih1], 0.50166260916650918);
+    EXPECT_DOUBLE_EQ(netOut.composition[nnApprox8::Net::ihe4],0.48172270591286032);
+    EXPECT_DOUBLE_EQ(netOut.energy, -1.6433049870528356e+18);
+}