test: rework lib stuff to share common files

test/lib/locator/plugin/main.cpp

@@ -0,0 +1,32 @@
+#define CR_HOST
+
+#include <gtest/gtest.h>
+#include <cr.h>
+#include <entt/locator/locator.hpp>
+#include "types.h"
+
+TEST(Lib, Locator) {
+    entt::locator<service>::emplace().value = 42;
+
+    ASSERT_EQ(entt::locator<service>::value().value, 42);
+
+    userdata ud{};
+    ud.handle = entt::locator<service>::handle();
+    ud.value = 3;
+
+    cr_plugin ctx;
+    ctx.userdata = &ud;
+
+    cr_plugin_load(ctx, PLUGIN);
+    cr_plugin_update(ctx);
+
+    ASSERT_EQ(entt::locator<service>::value().value, ud.value);
+
+    // service updates do not propagate across boundaries
+    entt::locator<service>::emplace().value = 42;
+    cr_plugin_update(ctx);
+
+    ASSERT_NE(entt::locator<service>::value().value, ud.value);
+
+    cr_plugin_close(ctx);
+}