Activate json tests list logic and add tests

```
Listing of tests information into json file (--list-verbose) now uses json with extended meta data instead of :: separated string

* Changelog entry
Type: feature
Component: cpp-sdk

--list-verbose commands in Gtest and unittest are now using json with extended meta data instead of plain "::"-separated string
```
commit_hash:096b575c80989be0166f54b214e595dc58977fe0

2 files changed, 30 insertions, 31 deletions

diff --git a/library/cpp/testing/gtest/main.cpp b/library/cpp/testing/gtest/main.cpp
index 05cca1b71a7..ab2ee4a688c 100644
--- a/library/cpp/testing/gtest/main.cpp
+++ b/library/cpp/testing/gtest/main.cpp
@@ -408,23 +408,18 @@ void NGTest::ListTests(int listLevel, const std::string& listPath) {
             if (listLevel > 1) {
                 for (int j = 0; j < suite->total_test_count(); ++j) {
                     auto test = suite->GetTestInfo(j);
-                    if (false) {
-                        // TODO: YA-3943 будет открыто в следующем PR, активироввать функционал нужно в два шага
-                        NJson::TJsonValue testObj(NJson::JSON_MAP);
+                    NJson::TJsonValue testObj(NJson::JSON_MAP);
 
-                        testObj["test_suite_name"] = test->test_suite_name();
-                        testObj["name"] = test->name();
-                        testObj["file"] = test->file() ? test->file() : "";
-                        testObj["line"] = test->line();
-                        testObj["nodeid"] = std::string(test->test_suite_name()) + "::" + test->name();
-                        if (test->value_param()) {
-                            testObj["params"] = test->value_param();
-                        }
-
-                        (*listOut) << NJson::WriteJson(&testObj) << "\n";
-                    } else {
-                        (*listOut) << suite->name() << "::" << test->name() << "\n";
+                    testObj["test_suite_name"] = test->test_suite_name();
+                    testObj["name"] = test->name();
+                    testObj["file"] = test->file() ? test->file() : "";
+                    testObj["line"] = test->line();
+                    testObj["nodeid"] = std::string(test->test_suite_name()) + "::" + test->name();
+                    if (test->value_param()) {
+                        testObj["params"] = test->value_param();
                     }
+
+                    (*listOut) << NJson::WriteJson(&testObj, false) << "\n";
                 }
             } else {
                 (*listOut) << suite->name() << "\n";
diff --git a/library/cpp/testing/unittest/utmain.cpp b/library/cpp/testing/unittest/utmain.cpp
index 9bb43051d97..63c2875fbae 100644
--- a/library/cpp/testing/unittest/utmain.cpp
+++ b/library/cpp/testing/unittest/utmain.cpp
@@ -603,9 +603,10 @@ const char* const TColoredProcessor::ForkCorrectExitMsg = "--END--";
 
 class TEnumeratingProcessor: public ITestSuiteProcessor {
 public:
-    TEnumeratingProcessor(bool verbose, IOutputStream& stream) noexcept
+    TEnumeratingProcessor(bool verbose, IOutputStream& stream, bool isFileOutput = false) noexcept
         : Verbose_(verbose)
         , Stream_(stream)
+        , IsFileOutput_(isFileOutput)
     {
     }
 
@@ -627,18 +628,20 @@ public:
     }
 
     bool CheckAccessTest(TString suite, const char* name, const char* file, int line) override {
-        if (false) {
-            // TODO: YA-3943 будет открыто в следующем PR, активироввать функционал нужно в два шага
-            // if (Verbose_) {
-            NJson::TJsonValue testObj;
-            testObj["test_suite_name"] = suite;
-            testObj["name"] = name;
-            testObj["file"] = file ? file : "";
-            testObj["line"] = line;
-            testObj["nodeid"] = suite + "::" + name;
-
-            NJson::WriteJson(&Stream_, &testObj);
-            Stream_.Write("\n");
+        if (Verbose_) {
+            // If we processing output to file (list-path), we would use JSON, else old plain text format
+            if (IsFileOutput_) {
+                NJson::TJsonValue testObj;
+                testObj["test_suite_name"] = suite;
+                testObj["name"] = name;
+                testObj["file"] = file ? file : "";
+                testObj["line"] = line;
+                testObj["nodeid"] = suite + "::" + name;
+                NJson::WriteJson(&Stream_, &testObj);
+                Stream_.Write("\n");
+            } else {
+                Stream_ << suite << "::" << name << "\n";
+            }
         } else {
             Stream_ << suite << "::" << name << "\n";
         }
@@ -648,6 +651,7 @@ public:
 private:
     bool Verbose_;
     IOutputStream& Stream_;
+    bool IsFileOutput_;
 };
 
 #ifdef _win_
@@ -683,8 +687,8 @@ private:
 static const TWinEnvironment Instance;
 #endif // _win_
 
-static int DoList(bool verbose, IOutputStream& stream) {
-    TEnumeratingProcessor eproc(verbose, stream);
+static int DoList(bool verbose, IOutputStream& stream, bool isFileOutput = false) {
+    TEnumeratingProcessor eproc(verbose, stream, isFileOutput);
     TTestFactory::Instance().SetProcessor(&eproc);
     TTestFactory::Instance().Execute();
     return 0;
@@ -871,7 +875,7 @@ int NUnitTest::RunMain(int argc, char** argv) {
             }
         }
         if (listTests != DONT_LIST) {
-            return DoList(listTests == LIST_VERBOSE, *listStream);
+            return DoList(listTests == LIST_VERBOSE, *listStream, listFile.Get() != nullptr);
         }
 
         if (!hasJUnitProcessor) {