176 lines
5.7 KiB
Markdown
176 lines
5.7 KiB
Markdown
<a id="top"></a>
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# Reporter events
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**Contents**<br>
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[Test running events](#test-running-events)<br>
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[Benchmarking events](#benchmarking-events)<br>
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[Listings events](#listings-events)<br>
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[Miscellaneous events](#miscellaneous-events)<br>
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Reporter events are one of the customization points for user code. They
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are used by [reporters](reporters.md#top) to customize Catch2's output,
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and by [event listeners](event-listeners.md#top) to perform in-process
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actions under some conditions.
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There are currently 21 reporter events in Catch2, split between 4 distinct
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event groups:
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* test running events (10 events)
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* benchmarking (4 events)
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* listings (3 events)
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* miscellaneous (4 events)
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## Test running events
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Test running events are always paired so that for each `fooStarting` event,
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there is a `fooEnded` event. This means that the 10 test running events
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consist of 5 pairs of events:
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* `testRunStarting` and `testRunEnded`,
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* `testCaseStarting` and `testCaseEnded`,
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* `testCasePartialStarting` and `testCasePartialEnded`,
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* `sectionStarting` and `sectionEnded`,
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* `assertionStarting` and `assertionEnded`
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### `testRun` events
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```cpp
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void testRunStarting( TestRunInfo const& testRunInfo );
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void testRunEnded( TestRunStats const& testRunStats );
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```
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The `testRun` events bookend the entire test run. `testRunStarting` is
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emitted before the first test case is executed, and `testRunEnded` is
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emitted after all the test cases have been executed.
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### `testCase` events
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```cpp
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void testCaseStarting( TestCaseInfo const& testInfo );
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void testCaseEnded( TestCaseStats const& testCaseStats );
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```
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The `testCase` events bookend one _full_ run of a specific test case.
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Individual runs through a test case, e.g. due to `SECTION`s or `GENERATE`s,
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are handled by a different event.
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### `testCasePartial` events
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> Introduced in Catch2 3.0.1
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```cpp
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void testCasePartialStarting( TestCaseInfo const& testInfo, uint64_t partNumber );
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void testCasePartialEnded(TestCaseStats const& testCaseStats, uint64_t partNumber );
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```
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`testCasePartial` events bookend one _partial_ run of a specific test case.
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This means that for any given test case, these events can be emitted
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multiple times, e.g. due to multiple leaf sections.
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In regards to nesting with `testCase` events, `testCasePartialStarting`
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will never be emitted before the corresponding `testCaseStarting`, and
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`testCasePartialEnded` will always be emitted before the corresponding
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`testCaseEnded`.
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### `section` events
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```cpp
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void sectionStarting( SectionInfo const& sectionInfo );
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void sectionEnded( SectionStats const& sectionStats );
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```
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`section` events are emitted only for active `SECTION`s, that is, sections
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that are entered. Sections that are skipped in this test case run-through
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do not cause events to be emitted.
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_Note that test cases always contain one implicit section. The event for
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this section is emitted after the corresponding `testCasePartialStarting`
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event._
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### `assertion` events
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```cpp
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void assertionStarting( AssertionInfo const& assertionInfo );
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void assertionEnded( AssertionStats const& assertionStats );
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```
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The `assertionStarting` event is emitted before the expression in the
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assertion is captured or evaluated and `assertionEnded` is emitted
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afterwards. This means that given assertion like `REQUIRE(a + b == c + d)`,
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Catch2 first emits `assertionStarting` event, then `a + b` and `c + d`
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are evaluated, then their results are captured, the comparison is evaluated,
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and then `assertionEnded` event is emitted.
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## Benchmarking events
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> [Introduced](https://github.com/catchorg/Catch2/issues/1616) in Catch2 2.9.0.
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```cpp
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void benchmarkPreparing( StringRef name ) override;
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void benchmarkStarting( BenchmarkInfo const& benchmarkInfo ) override;
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void benchmarkEnded( BenchmarkStats<> const& benchmarkStats ) override;
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void benchmarkFailed( StringRef error ) override;
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```
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Due to the benchmark lifecycle being bit more complicated, the benchmarking
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events have their own category, even though they could be seen as parallel
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to the `assertion*` events. You should expect running a benchmark to
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generate at least 2 of the events above.
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To understand the explanation below, you should read the [benchmarking
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documentation](benchmarks.md#top) first.
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* `benchmarkPreparing` event is sent after the environmental probe
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finishes, but before the user code is first estimated.
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* `benchmarkStarting` event is sent after the user code is estimated,
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but has not been benchmarked yet.
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* `benchmarkEnded` event is sent after the user code has been benchmarked,
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and contains the benchmarking results.
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* `benchmarkFailed` event is sent if either the estimation or the
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benchmarking itself fails.
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## Listings events
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> Introduced in Catch2 3.0.1.
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Listings events are events that correspond to the test binary being
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invoked with `--list-foo` flag.
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There are currently 3 listing events, one for reporters, one for tests,
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and one for tags. Note that they are not exclusive to each other.
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```cpp
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void listReporters( std::vector<ReporterDescription> const& descriptions );
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void listTests( std::vector<TestCaseHandle> const& tests );
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void listTags( std::vector<TagInfo> const& tagInfos );
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```
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## Miscellaneous events
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```cpp
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void reportInvalidTestSpec( StringRef unmatchedSpec );
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void fatalErrorEncountered( StringRef error );
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void noMatchingTestCases( StringRef unmatchedSpec );
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```
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These are one-off events that do not neatly fit into other categories.
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`reportInvalidTestSpec` is sent for each [test specification command line
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argument](command-line.md#specifying-which-tests-to-run) that wasn't
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parsed into a valid spec.
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`fatalErrorEncountered` is sent when Catch2's POSIX signal handling
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or Windows SE handler is called into with a fatal signal/exception.
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`noMatchingTestCases` is sent for each user provided test specification
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that did not match any registered tests.
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---
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[Home](Readme.md#top)
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