feat: add domain model foundation

tests/core/step_definition_test.cpp

@@ -0,0 +1,37 @@
+#include "fesa/core/StepDefinition.hpp"
+
+namespace {
+
+int require(bool condition) {
+    return condition ? 0 : 1;
+}
+
+} // namespace
+
+int run_step_definition_tests() {
+    const fesa::core::LinearStaticStepDefinition step{1, "load-step", {0, 2}, {1}};
+
+    if (const int result = require(step.id() == 1); result != 0) {
+        return result;
+    }
+    if (const int result = require(step.name() == "load-step"); result != 0) {
+        return result;
+    }
+    if (const int result = require(step.boundaryConditionIndices().size() == 2); result != 0) {
+        return result;
+    }
+    if (const int result = require(step.boundaryConditionIndices()[0] == 0); result != 0) {
+        return result;
+    }
+    if (const int result = require(step.boundaryConditionIndices()[1] == 2); result != 0) {
+        return result;
+    }
+    if (const int result = require(step.loadIndices().size() == 1); result != 0) {
+        return result;
+    }
+    if (const int result = require(step.loadIndices()[0] == 1); result != 0) {
+        return result;
+    }
+
+    return 0;
+}