feat: split tests into per-suite files

tests/main.cpp

@@ -0,0 +1,49 @@
+#include <cstdlib>
+#include <cstring>
+#include <iostream>
+
+void RunCoreTests();
+void RunSerializationTests();
+void RunPhysicsTests();
+void RunAssetsTests();
+void RunGraphicsTests();
+void RunUiTests();
+void RunGameplayTests();
+
+namespace {
+    struct Suite {
+        const char* name;
+        void (*run)();
+    };
+
+    constexpr Suite suites[] = {
+        {"core", RunCoreTests},
+        {"serialization", RunSerializationTests},
+        {"physics", RunPhysicsTests},
+        {"assets", RunAssetsTests},
+        {"graphics", RunGraphicsTests},
+        {"ui", RunUiTests},
+        {"gameplay", RunGameplayTests},
+    };
+}
+
+int main(int argc, char* argv[])
+{
+    const char* only = argc > 1 ? argv[1] : nullptr;
+    bool ranAny = false;
+
+    for (const Suite& suite : suites) {
+        if (only != nullptr && std::strcmp(only, suite.name) != 0) {
+            continue;
+        }
+        suite.run();
+        ranAny = true;
+        std::cout << suite.name << " tests passed\n";
+    }
+
+    if (!ranAny) {
+        std::cerr << "unknown test suite: " << only << '\n';
+        return EXIT_FAILURE;
+    }
+    return EXIT_SUCCESS;
+}