feat: add domain model foundation

tests/core/node_test.cpp

@@ -0,0 +1,37 @@
+#include "fesa/core/Node.hpp"
+
+namespace {
+
+int require(bool condition) {
+    return condition ? 0 : 1;
+}
+
+} // namespace
+
+int run_node_tests() {
+    const fesa::core::Node node{42, 1.0, 2.0, 3.0};
+
+    if (const int result = require(node.id() == 42); result != 0) {
+        return result;
+    }
+    if (const int result = require(node.x() == 1.0); result != 0) {
+        return result;
+    }
+    if (const int result = require(node.y() == 2.0); result != 0) {
+        return result;
+    }
+    if (const int result = require(node.z() == 3.0); result != 0) {
+        return result;
+    }
+    if (const int result = require(node.coordinates()[0] == 1.0); result != 0) {
+        return result;
+    }
+    if (const int result = require(node.coordinates()[1] == 2.0); result != 0) {
+        return result;
+    }
+    if (const int result = require(node.coordinates()[2] == 3.0); result != 0) {
+        return result;
+    }
+
+    return 0;
+}