1 files changed, 36 insertions, 0 deletions
diff --git a/library/cpp/yaml/fyamlcpp/fyamlcpp_ut.cpp b/library/cpp/yaml/fyamlcpp/fyamlcpp_ut.cpp
index f9aab7b011b..94093c4157b 100644
--- a/library/cpp/yaml/fyamlcpp/fyamlcpp_ut.cpp
+++ b/library/cpp/yaml/fyamlcpp/fyamlcpp_ut.cpp
@@ -50,4 +50,40 @@ test: output
 
         UNIT_ASSERT_VALUES_EQUAL(ss.Str(), "test: output\n");
     }
+
+    Y_UNIT_TEST(Parser) {
+        const char *yaml = R"(
+test: a
+---
+test: b
+)";
+        auto parser = NFyaml::TParser::Create(yaml);
+
+        TStringStream ss;
+
+        auto docOpt = parser.NextDocument();
+        UNIT_ASSERT(docOpt);
+        ss << *docOpt;
+        UNIT_ASSERT_VALUES_EQUAL(ss.Str(), "test: a\n");
+        auto beginMark = docOpt->BeginMark();
+        UNIT_ASSERT_VALUES_EQUAL(beginMark.InputPos, 1);
+        auto endMark = docOpt->EndMark();
+        UNIT_ASSERT_VALUES_EQUAL(endMark.InputPos, 12);
+        UNIT_ASSERT_VALUES_EQUAL(TStringBuf(yaml).SubStr(beginMark.InputPos, endMark.InputPos - 4), ss.Str());
+
+        ss.clear();
+
+        auto docOpt2 = parser.NextDocument();
+        UNIT_ASSERT(docOpt2);
+        ss << *docOpt2;
+        UNIT_ASSERT_VALUES_EQUAL(ss.Str(), "---\ntest: b\n");
+        beginMark = docOpt2->BeginMark();
+        UNIT_ASSERT_VALUES_EQUAL(beginMark.InputPos, 9);
+        endMark = docOpt2->EndMark();
+        UNIT_ASSERT_VALUES_EQUAL(endMark.InputPos, 21);
+        UNIT_ASSERT_VALUES_EQUAL(TStringBuf(yaml).SubStr(beginMark.InputPos, endMark.InputPos), ss.Str());
+
+        auto docOpt3 = parser.NextDocument();
+        UNIT_ASSERT(!docOpt3);
+    }
 }