feat(tests): rework tests in numerous ways (#3059)

tests/tests_main.cpp

@@ -0,0 +1,15 @@
+/**
+ * @file tests/tests_main.cpp
+ * @brief Entry point definition.
+ */
+#include "tests_common.h"
+#include "tests_environment.h"
+#include "tests_events.h"
+
+int
+main(int argc, char **argv) {
+  testing::InitGoogleTest(&argc, argv);
+  testing::AddGlobalTestEnvironment(new SunshineEnvironment);
+  testing::UnitTest::GetInstance()->listeners().Append(new SunshineEventListener);
+  return RUN_ALL_TESTS();
+}