Improve slang-test output verbosity control (#7625)

* Improve slang-test output verbosity control

This commit improves the existing command-line argument for slang-test,
"-v". Previously it printed more information when "-v" was used.

This commit adds a new option to silence the information output so that
LLM processes less tokens when things are working as expected.

* format code (#74)

---------

Co-authored-by: slangbot <ellieh+slangbot@nvidia.com>

1 files changed, 13 insertions, 3 deletions

diff --git a/tools/slang-test/test-reporter.cpp b/tools/slang-test/test-reporter.cpp
index 352245028..3aba10566 100644
--- a/tools/slang-test/test-reporter.cpp
+++ b/tools/slang-test/test-reporter.cpp
@@ -3,6 +3,7 @@
 
 #include "../../source/core/slang-process-util.h"
 #include "../../source/core/slang-string-util.h"
+#include "options.h"
 
 #include <mutex>
 #include <stdio.h>
@@ -91,7 +92,7 @@ TestReporter::TestReporter()
 
     m_inTest = false;
     m_dumpOutputOnFailure = false;
-    m_isVerbose = false;
+    m_verbosity = VerbosityLevel::Info;
 }
 
 Result TestReporter::init(
@@ -371,8 +372,17 @@ void TestReporter::_addResult(TestInfo info)
 
     m_testInfos.add(info);
 
-    auto defaultOutputFunc = [](const TestInfo& info)
+    auto defaultOutputFunc = [this](const TestInfo& info)
     {
+        // Skip output for passed/ignored tests if verbosity < Info
+        if (m_verbosity < VerbosityLevel::Info)
+        {
+            if (info.testResult == TestResult::Pass || info.testResult == TestResult::Ignored)
+            {
+                return;
+            }
+        }
+
         char const* resultString = "UNEXPECTED";
         switch (info.testResult)
         {
@@ -589,7 +599,7 @@ void TestReporter::message(TestMessageType type, const String& message)
 
     if (type == TestMessageType::Info)
     {
-        if (m_isVerbose && canWriteStdError())
+        if (m_verbosity == VerbosityLevel::Verbose && canWriteStdError())
         {
             fputs(message.getBuffer(), stderr);
         }