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diff --git a/src/catch2/internal/catch_run_context.hpp b/src/catch2/internal/catch_run_context.hpp
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+++ b/src/catch2/internal/catch_run_context.hpp
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+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+#ifndef CATCH_RUN_CONTEXT_HPP_INCLUDED
+#define CATCH_RUN_CONTEXT_HPP_INCLUDED
+
+#include <catch2/interfaces/catch_interfaces_capture.hpp>
+#include <catch2/internal/catch_test_registry.hpp>
+#include <catch2/internal/catch_test_run_info.hpp>
+#include <catch2/internal/catch_fatal_condition_handler.hpp>
+#include <catch2/catch_test_case_info.hpp>
+#include <catch2/catch_message.hpp>
+#include <catch2/catch_totals.hpp>
+#include <catch2/internal/catch_test_case_tracker.hpp>
+#include <catch2/catch_assertion_info.hpp>
+#include <catch2/catch_assertion_result.hpp>
+#include <catch2/internal/catch_optional.hpp>
+#include <catch2/internal/catch_move_and_forward.hpp>
+
+#include <string>
+
+namespace Catch {
+
+    class IGeneratorTracker;
+    class IConfig;
+    class IEventListener;
+    using IEventListenerPtr = Detail::unique_ptr<IEventListener>;
+    class OutputRedirect;
+
+    ///////////////////////////////////////////////////////////////////////////
+
+    class RunContext final : public IResultCapture {
+
+    public:
+        RunContext( RunContext const& ) = delete;
+        RunContext& operator =( RunContext const& ) = delete;
+
+        explicit RunContext( IConfig const* _config, IEventListenerPtr&& reporter );
+
+        ~RunContext() override;
+
+        Totals runTest(TestCaseHandle const& testCase);
+
+    public: // IResultCapture
+
+        // Assertion handlers
+        void handleExpr
+                (   AssertionInfo const& info,
+                    ITransientExpression const& expr,
+                    AssertionReaction& reaction ) override;
+        void handleMessage
+                (   AssertionInfo const& info,
+                    ResultWas::OfType resultType,
+                    std::string&& message,
+                    AssertionReaction& reaction ) override;
+        void handleUnexpectedExceptionNotThrown
+                (   AssertionInfo const& info,
+                    AssertionReaction& reaction ) override;
+        void handleUnexpectedInflightException
+                (   AssertionInfo const& info,
+                    std::string&& message,
+                    AssertionReaction& reaction ) override;
+        void handleIncomplete
+                (   AssertionInfo const& info ) override;
+        void handleNonExpr
+                (   AssertionInfo const &info,
+                    ResultWas::OfType resultType,
+                    AssertionReaction &reaction ) override;
+
+        void notifyAssertionStarted( AssertionInfo const& info ) override;
+        bool sectionStarted( StringRef sectionName,
+                             SourceLineInfo const& sectionLineInfo,
+                             Counts& assertions ) override;
+
+        void sectionEnded( SectionEndInfo&& endInfo ) override;
+        void sectionEndedEarly( SectionEndInfo&& endInfo ) override;
+
+        IGeneratorTracker*
+        acquireGeneratorTracker( StringRef generatorName,
+                                 SourceLineInfo const& lineInfo ) override;
+        IGeneratorTracker* createGeneratorTracker(
+            StringRef generatorName,
+            SourceLineInfo lineInfo,
+            Generators::GeneratorBasePtr&& generator ) override;
+
+
+        void benchmarkPreparing( StringRef name ) override;
+        void benchmarkStarting( BenchmarkInfo const& info ) override;
+        void benchmarkEnded( BenchmarkStats<> const& stats ) override;
+        void benchmarkFailed( StringRef error ) override;
+
+        void pushScopedMessage( MessageInfo const& message ) override;
+        void popScopedMessage( MessageInfo const& message ) override;
+
+        void emplaceUnscopedMessage( MessageBuilder&& builder ) override;
+
+        std::string getCurrentTestName() const override;
+
+        const AssertionResult* getLastResult() const override;
+
+        void exceptionEarlyReported() override;
+
+        void handleFatalErrorCondition( StringRef message ) override;
+
+        bool lastAssertionPassed() override;
+
+        void assertionPassed() override;
+
+    public:
+        // !TBD We need to do this another way!
+        bool aborting() const;
+
+    private:
+
+        void runCurrentTest();
+        void invokeActiveTestCase();
+
+        void resetAssertionInfo();
+        bool testForMissingAssertions( Counts& assertions );
+
+        void assertionEnded( AssertionResult&& result );
+        void reportExpr
+                (   AssertionInfo const &info,
+                    ResultWas::OfType resultType,
+                    ITransientExpression const *expr,
+                    bool negated );
+
+        void populateReaction( AssertionReaction& reaction );
+
+    private:
+
+        void handleUnfinishedSections();
+
+        TestRunInfo m_runInfo;
+        TestCaseHandle const* m_activeTestCase = nullptr;
+        ITracker* m_testCaseTracker = nullptr;
+        Optional<AssertionResult> m_lastResult;
+
+        IConfig const* m_config;
+        Totals m_totals;
+        IEventListenerPtr m_reporter;
+        std::vector<MessageInfo> m_messages;
+        std::vector<ScopedMessage> m_messageScopes; /* Keeps owners of so-called unscoped messages. */
+        AssertionInfo m_lastAssertionInfo;
+        std::vector<SectionEndInfo> m_unfinishedSections;
+        std::vector<ITracker*> m_activeSections;
+        TrackerContext m_trackerContext;
+        Detail::unique_ptr<OutputRedirect> m_outputRedirect;
+        FatalConditionHandler m_fatalConditionhandler;
+        bool m_lastAssertionPassed = false;
+        bool m_shouldReportUnexpected = true;
+        bool m_includeSuccessfulResults;
+    };
+
+    void seedRng(IConfig const& config);
+    unsigned int rngSeed();
+} // end namespace Catch
+
+#endif // CATCH_RUN_CONTEXT_HPP_INCLUDED