Add fatalErrorEncountered method to Reporter/Listener interface

An empty default implementation is provided to keep backward compatibility.
Called when signal or Structured Exception is encountered.

Related to #1005

include/internal/catch_interfaces_reporter.cpp

@@ -105,7 +105,7 @@ namespace Catch {
 
     TestRunStats::~TestRunStats() = default;
 
-
+    void IStreamingReporter::fatalErrorEncountered( StringRef name ) {}
     bool IStreamingReporter::isMulti() const { return false; }
 
     IReporterFactory::~IReporterFactory() = default;

include/internal/catch_interfaces_reporter.h

@@ -16,6 +16,7 @@
 #include "catch_assertionresult.h"
 #include "catch_message.h"
 #include "catch_option.hpp"
+#include "catch_stringref.h"
 
 
 #include <string>
@@ -201,6 +202,9 @@ namespace Catch {
 
         virtual void skipTest( TestCaseInfo const& testInfo ) = 0;
 
+        // Default empty implementation provided
+        virtual void fatalErrorEncountered( StringRef name );
+
         virtual bool isMulti() const;
     };
     using IStreamingReporterPtr = std::unique_ptr<IStreamingReporter>;

include/internal/catch_run_context.cpp

@@ -209,6 +209,9 @@ namespace Catch {
     }
 
     void RunContext::handleFatalErrorCondition(std::string const & message) {
+        // First notify reporter that bad things happened
+        m_reporter->fatalErrorEncountered(message);
+
         // Don't rebuild the result -- the stringification itself can cause more fatal errors
         // Instead, fake a result data.
         AssertionResultData tempResult( ResultWas::FatalErrorCondition, { false } );