diff --git a/cpp-tests/tests/coverall/main.cpp b/cpp-tests/tests/coverall/main.cpp
index aa9712e..26430f4 100644
--- a/cpp-tests/tests/coverall/main.cpp
+++ b/cpp-tests/tests/coverall/main.cpp
@@ -1,7 +1,156 @@
 #include "test_common.hpp"
 
+#include <thread>
 #include <coverall.hpp>
 
+void test_some_dict() {
+    auto dict = coverall::create_some_dict();
+
+    ASSERT_EQ("text", dict.text);
+    ASSERT_EQ("maybe_text", dict.maybe_text);
+    ASSERT_EQ("some_bytes", std::string(dict.some_bytes.begin(), dict.some_bytes.end()));
+    ASSERT_EQ("maybe_some_bytes", std::string(dict.maybe_some_bytes->begin(), dict.maybe_some_bytes->end()));
+    ASSERT_EQ(true, dict.a_bool);
+    ASSERT_EQ(false, dict.maybe_a_bool);
+    ASSERT_EQ(1, dict.unsigned8);
+    ASSERT_EQ(2, dict.maybe_unsigned8);
+    ASSERT_EQ(3, dict.unsigned16);
+    ASSERT_EQ(4, dict.maybe_unsigned16);
+    ASSERT_EQ(std::numeric_limits<uint64_t>::max(), dict.unsigned64);
+    ASSERT_EQ(std::numeric_limits<uint64_t>::min(), dict.maybe_unsigned64);
+    ASSERT_EQ(8, dict.signed8);
+    ASSERT_EQ(0, dict.maybe_signed8);
+    ASSERT_EQ(std::numeric_limits<int64_t>::max(), dict.signed64);
+    ASSERT_EQ(0, dict.maybe_signed64);
+    ASSERT_EQ(1.2345f, dict.float32);
+    ASSERT_EQ(22.0f / 7.0f, dict.maybe_float32);
+    ASSERT_EQ(0.0, dict.float64);
+    ASSERT_EQ(1.0, dict.maybe_float64);
+    ASSERT_EQ("some_dict", dict.coveralls.value()->get_name());
+}
+
+void test_arcs() {
+    {
+        auto coveralls = coverall::Coveralls::init("test_arcs");
+
+        ASSERT_EQ(1ul, coverall::get_num_alive());
+        ASSERT_EQ(2ul, coveralls->strong_count());
+        ASSERT_EQ(std::nullopt, coveralls->get_other());
+
+        coveralls->take_other(coveralls);
+        ASSERT_EQ(3ul, coveralls->strong_count());
+        ASSERT_EQ(1ul, coverall::get_num_alive());
+
+        {
+            auto other = coveralls->get_other();
+            ASSERT_EQ("test_arcs", other.value()->get_name());
+        }
+
+        EXPECT_EXCEPTION(coveralls->take_other_fallible(), coverall::coverall_error::TooManyHoles);
+        EXPECT_EXCEPTION(coveralls->take_other_panic("take_other_panic"), std::runtime_error);
+        EXPECT_EXCEPTION(coveralls->fallible_panic("fallible_panic"), std::runtime_error);
+
+        coveralls->take_other(std::nullopt);
+        ASSERT_EQ(2ul, coveralls->strong_count());
+    }
+
+    ASSERT_EQ(0ul, coverall::get_num_alive());
+}
+
+void test_object_returning() {
+    {
+        auto coveralls = coverall::Coveralls::init("test_object_returning");
+
+        ASSERT_EQ(1ul, coverall::get_num_alive());
+        ASSERT_EQ(2ul, coveralls->strong_count());
+        {
+            auto other = coveralls->clone_me();
+            ASSERT_EQ(coveralls->get_name(), other->get_name());
+            ASSERT_EQ(2ul, coverall::get_num_alive());
+            ASSERT_EQ(2ul, other->strong_count());
+
+            coveralls->take_other(other);
+            ASSERT_EQ(2ul, coverall::get_num_alive());
+            ASSERT_EQ(2ul, coveralls->strong_count());
+            ASSERT_EQ(3ul, other->strong_count());
+        }
+
+        ASSERT_EQ(2ul, coverall::get_num_alive());
+    }
+
+    ASSERT_EQ(0ul, coverall::get_num_alive());
+}
+
+void test_simple_errors() {
+    auto coveralls = coverall::Coveralls::init("test_simple_errors");
+
+    EXPECT_EXCEPTION(coveralls->maybe_throw(true), coverall::coverall_error::TooManyHoles);
+    EXPECT_EXCEPTION(coveralls->maybe_throw_into(true), coverall::coverall_error::TooManyHoles);
+    EXPECT_EXCEPTION(coveralls->panic("coveralls->panic()"), std::runtime_error);
+}
+
+void test_complex_errors() {
+    auto coveralls = coverall::Coveralls::init("test_complex_errors");
+
+    ASSERT_TRUE(coveralls->maybe_throw_complex(0));
+
+    try {
+        coveralls->maybe_throw_complex(1);
+        ASSERT_TRUE(false);
+    } catch (const coverall::complex_error::OsError& e) {
+        ASSERT_EQ(10, e.code);
+        ASSERT_EQ(20, e.extended_code);
+    }
+
+    try {
+        coveralls->maybe_throw_complex(2);
+        ASSERT_TRUE(false);
+    } catch (const coverall::complex_error::PermissionDenied& e) {
+        ASSERT_EQ("Forbidden", e.reason);
+
+        EXPECT_EXCEPTION(coveralls->maybe_throw_complex(3), coverall::complex_error::UnknownError);
+        EXPECT_EXCEPTION(coveralls->maybe_throw_complex(4), std::runtime_error);
+    }
+}
+
+void test_interface_in_dicts() {
+    auto coveralls = coverall::Coveralls::init("test_interface_in_dicts");
+
+    coveralls->add_patch(coverall::Patch::init(coverall::Color::RED));
+    coveralls->add_repair(coverall::Repair {.when = std::chrono::system_clock::now(), .patch = coverall::Patch::init(coverall::Color::GREEN)});
+    ASSERT_EQ(2, coveralls->get_repairs().size());
+}
+
+void test_multithread_calls() {
+    const int WAIT_TIME = 20;
+
+    auto counter = coverall::ThreadsafeCounter::init();
+
+    auto thread = std::thread([&counter]() {
+        counter->busy_wait(WAIT_TIME);
+    });
+
+    auto count = 0;
+    auto count_thread = std::thread([&counter, &count]() {
+        for(auto i = 0; i < WAIT_TIME; i++) {
+            count = counter->increment_if_busy();
+            std::this_thread::sleep_for(std::chrono::milliseconds(1));
+        }
+    });
+
+    thread.join();
+    count_thread.join();
+    ASSERT_TRUE(count > 0);
+}
+
 int main() {
+    test_some_dict();
+    test_arcs();
+    test_object_returning();
+    test_simple_errors();
+    test_complex_errors();
+    test_interface_in_dicts();
+    test_multithread_calls();
+
     return 0;
 }
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