feat: add property model foundation

tests/property/property_base_test.cpp

@@ -0,0 +1,37 @@
+#include "fesa/property/Property.hpp"
+
+#include <memory>
+
+namespace {
+
+int require(bool condition) {
+    return condition ? 0 : 1;
+}
+
+class TestProperty final : public fesa::property::Property {
+public:
+    explicit TestProperty(fesa::core::PropertyId id) : id_(id) {}
+
+    fesa::core::PropertyId id() const noexcept override {
+        return id_;
+    }
+
+    fesa::property::PropertyKind kind() const noexcept override {
+        return fesa::property::PropertyKind::Shell;
+    }
+
+private:
+    fesa::core::PropertyId id_;
+};
+
+} // namespace
+
+int run_property_base_tests() {
+    std::unique_ptr<fesa::property::Property> owned = std::make_unique<TestProperty>(500);
+    const fesa::property::Property& property = *owned;
+
+    if (const int result = require(property.id() == 500); result != 0) {
+        return result;
+    }
+    return require(property.kind() == fesa::property::PropertyKind::Shell);
+}

tests/property/shell_property_test.cpp

@@ -1,4 +1,5 @@
 #include "fesa/property/ShellProperty.hpp"
+#include "fesa/property/Property.hpp"
 
 #include <stdexcept>
 
@@ -24,10 +25,17 @@ int require_throws(Function&& function) {
 
 int run_shell_property_tests() {
     const fesa::property::ShellProperty property{500, 700, 0.01};
+    const fesa::property::Property& base = property;
 
     if (const int result = require(property.id() == 500); result != 0) {
         return result;
     }
+    if (const int result = require(base.id() == 500); result != 0) {
+        return result;
+    }
+    if (const int result = require(base.kind() == fesa::property::PropertyKind::Shell); result != 0) {
+        return result;
+    }
     if (const int result = require(property.materialId() == 700); result != 0) {
         return result;
     }