additional tests have been added

Author: dorooleg

ydb/library/yql/providers/s3/compressors/ut/decompressor_ut.cpp

@@ -28,6 +28,18 @@ Y_UNIT_TEST_SUITE(TCompressorTests) {
             }
             ])"));
     }
+
+    Y_UNIT_TEST(WrongMagicLz4) {
+        NDB::ReadBufferFromFile buffer(GetResourcePath("test.json"));
+        UNIT_ASSERT_EXCEPTION_CONTAINS(std::make_unique<NLz4::TReadBuffer>(buffer), yexception, "TReadBuffer(): requirement StreamType != EStreamType::Unknown failed, message: Wrong magic.");
+    }
+
+    Y_UNIT_TEST(ErrorLz4) {
+        NDB::ReadBufferFromFile buffer(GetResourcePath("test.broken.lz4"));
+        auto decompressorBuffer = std::make_unique<NLz4::TReadBuffer>(buffer);
+        char str[256] = {};
+        UNIT_ASSERT_EXCEPTION_CONTAINS(decompressorBuffer->read(str, 256), yexception, "DecompressFrame(): requirement !LZ4F_isError(NextToLoad) failed, message: Decompression error: ERROR_reservedFlag_set");
+    }
 }
 
 }

ydb/library/yql/providers/s3/compressors/ut/test_compression_data/test.broken.lz4

@@ -0,0 +1,8 @@
+[
+{
+    "id": 0,
+    "description": "yq",
+    "info": "abc"
+}
+]
+