Replace Catch2's runner with the Catch3 runner

Catch3 keeps Catch2's API for writing tests (test cases, sections,
assertions, matchers, generators, listeners, benchmarks) and replaces its
session, command line and reporters with a runner of its own.

The runner starts the test binary again as worker processes that take the
next test when they are free. A crash, an exit or a hang ends one test, not
the run. On top of that it adds:

- retries that tell deterministic, flaky and order-dependent failures
  apart, and a bisection that names the test leaving state behind;
- a history of verdicts and durations, kept under a file lock, that drives
  automatic quarantine, adaptive time limits, predictive ordering,
  incremental runs, failure replay and analytics;
- selection by change, past failure or prediction, dependency closure,
  and sharding by a stable hash or by recorded durations;
- tags for serial and isolated tests, shared resources, dependencies,
  time limits and retries;
- a failure category, a signature, an analysis and a replay command for
  every failure;
- console, JUnit XML (with flakyFailure and rerunFailure), JSON and Chrome
  trace reports, and a versioned discovery listing (--list=json);
- a temporary directory per test (TMPDIR, TMP, TEMP and
  TestTemporaryDirectory());
- Bazel's test environment: XML output file, test filter, sharding, seed,
  premature exit file and undeclared outputs.

The command line is parsed by a hand-written, typed parser. Catch::Session
remains as a thin facade over the runner for custom main functions.

The result model in Progmasoft/Catch3/Results.hpp was rewritten around
tests and attempts, and the JUnit writer now writes it. The property
engine's example database is updated under a file lock with an atomic
rename, so parallel workers can write it at the same time.

Removed: Clara, the command-line and reporter-spec parsers, every reporter
and CATCH_REGISTER_REPORTER, listing, text flow, console colour and width,
the JSON and XML writers, sharding in the test registry, approval tests and
their baselines, Conan packaging, and the unused third_party/clara.hpp.
Listeners keep working; reporters' list and skip events are gone.

The Catch2 library is now compiled as C++20; code that includes only
Catch2's headers still needs C++14. Duplicate test cases are still refused
at start-up. Version 0.3.0.

ExtraTests now turn exceptions off for clang-cl with MSVC-style options,
which -fno-exceptions did not do.

1 files changed, 20 insertions, 20 deletions

diff --git a/tests/ExtraTests/X21-PartialTestCaseEvents.cpp b/tests/ExtraTests/X21-PartialTestCaseEvents.cpp
index aa5204c9..c55f6c2b 100644
--- a/tests/ExtraTests/X21-PartialTestCaseEvents.cpp
+++ b/tests/ExtraTests/X21-PartialTestCaseEvents.cpp
@@ -7,59 +7,59 @@
 // SPDX-License-Identifier: BSL-1.0
 
 /**\file
- * Registers custom reporter that reports testCase* events
+ * Registers a listener that records the testCase* events and prints them
+ * when the test run ends, outside any test, where the runner passes the
+ * output on.
  *
  * The resulting executable can then be used by an external Python script
  * to verify that testCase{Starting,Ended} and testCasePartial{Starting,Ended}
  * events are properly nested.
  */
 
-
 #include <catch2/catch_test_macros.hpp>
-#include <catch2/reporters/catch_reporter_streaming_base.hpp>
 #include <catch2/catch_test_case_info.hpp>
+#include <catch2/reporters/catch_reporter_event_listener.hpp>
 #include <catch2/reporters/catch_reporter_registrars.hpp>
 #include <catch2/generators/catch_generators.hpp>
 
-
 #include <iostream>
+#include <string>
 
 using Catch::TestCaseInfo;
 using Catch::TestCaseStats;
 
-class PartialReporter : public Catch::StreamingReporterBase {
+class PartialListener : public Catch::EventListenerBase {
 public:
-    using StreamingReporterBase::StreamingReporterBase;
-
-    ~PartialReporter() override; // = default
-
-    static std::string getDescription() {
-        return "Special reporter for testing TestCasePartialStarting/Ended events";
-    }
+    using EventListenerBase::EventListenerBase;
 
     //! Called _once_ for each TEST_CASE, no matter how many times it is entered
     void testCaseStarting(TestCaseInfo const& testInfo) override {
-        std::cout << "TestCaseStarting: " << testInfo.name << '\n';
+        m_events += "TestCaseStarting: " + testInfo.name + '\n';
     }
     //! Called _every time_ a TEST_CASE is entered, including repeats (due to sections)
     void testCasePartialStarting(TestCaseInfo const& testInfo, uint64_t partNumber) override {
-        std::cout << "TestCaseStartingPartial: " << testInfo.name << '#' << partNumber << '\n';
+        m_events += "TestCaseStartingPartial: " + testInfo.name + '#' + std::to_string(partNumber) + '\n';
     }
 
-
     //! Called _every time_ a TEST_CASE is entered, including repeats (due to sections)
     void testCasePartialEnded(TestCaseStats const& testCaseStats, uint64_t partNumber) override {
-        std::cout << "TestCasePartialEnded: " << testCaseStats.testInfo->name << '#' << partNumber << '\n';
+        m_events += "TestCasePartialEnded: " + testCaseStats.testInfo->name + '#' + std::to_string(partNumber) + '\n';
     }
+
     //! Called _once_ for each TEST_CASE, no matter how many times it is entered
     void testCaseEnded(TestCaseStats const& testCaseStats) override {
-        std::cout << "TestCaseEnded: " << testCaseStats.testInfo->name << '\n';
+        m_events += "TestCaseEnded: " + testCaseStats.testInfo->name + '\n';
     }
-};
-PartialReporter::~PartialReporter() = default;
 
+    void testRunEnded( Catch::TestRunStats const& ) override {
+        std::cout << "BEGIN EVENTS\n" << m_events << "END EVENTS\n" << std::flush;
+    }
+
+private:
+    std::string m_events;
+};
 
-CATCH_REGISTER_REPORTER("partial", PartialReporter)
+CATCH_REGISTER_LISTENER(PartialListener)
 
 TEST_CASE("section") {
     SECTION("A") {}