YT-19210: expose YQL shared library for YT.

After this, a new target libyqlplugin.so appears. in open-source cmake build.
Diff in open-source YDB repo looks like the following: https://paste.yandex-team.ru/f302bdb4-7ef2-4362-91c7-6ca45f329264

1 files changed, 38 insertions, 0 deletions

diff --git a/library/cpp/yt/logging/unittests/logger_ut.cpp b/library/cpp/yt/logging/unittests/logger_ut.cpp
new file mode 100644
index 0000000000..7696ea4a83
--- /dev/null
+++ b/library/cpp/yt/logging/unittests/logger_ut.cpp
@@ -0,0 +1,38 @@
+#include <library/cpp/testing/gtest/gtest.h>
+
+#include <library/cpp/yt/logging/logger.h>
+
+namespace NYT::NLogging {
+namespace {
+
+////////////////////////////////////////////////////////////////////////////////
+
+TEST(TLogger, NullByDefault)
+{
+    {
+        TLogger logger;
+        EXPECT_FALSE(logger);
+        EXPECT_FALSE(logger.IsLevelEnabled(ELogLevel::Fatal));
+    }
+    {
+        TLogger logger{"Category"};
+        EXPECT_FALSE(logger);
+        EXPECT_FALSE(logger.IsLevelEnabled(ELogLevel::Fatal));
+    }
+}
+
+TEST(TLogger, CopyOfNullLogger)
+{
+    TLogger nullLogger{/*logManager*/ nullptr, "Category"};
+    ASSERT_FALSE(nullLogger);
+
+    auto logger = nullLogger.WithMinLevel(ELogLevel::Debug);
+
+    EXPECT_FALSE(logger);
+    EXPECT_FALSE(logger.IsLevelEnabled(ELogLevel::Fatal));
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+} // namespace
+} // namespace NYT::NLogging