olm/lib/doctest/doc/html_generated/reporters.html
Hubert Chathi 8475061136 switch to doctest for unit testing
thanks to Nico Werner, who did most of the porting work
2021-12-22 13:45:33 -05:00

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<!DOCTYPE html>
<html>
<title>reporters</title>
<xmp theme="united" style="display:none;">
## Reporters
Doctest has a modular reporter/listener system with which users can write their own reporters and register them. The reporter interface can also be used for "listening" to events.
You can list all registered reporters/listeners with ```--list-reporters```. There are a few implemented reporters in the framework:
- ```console``` - streaming - writes normal lines of text with coloring if a capable terminal is detected
- ```xml``` - streaming - writes in xml format tailored to doctest
- ```junit``` - buffering - writes in JUnit-compatible xml - for more information look [here](https://github.com/onqtam/doctest/issues/318) and [here](https://github.com/onqtam/doctest/issues/376).
Streaming means that results are delivered progressively and not at the end of the test run.
The output is by default written to ```stdout``` but can be redirected with the use of the ```--out=<filename>``` [**command line option**](commandline.html).
Example how to define your own reporter:
```
#include <doctest/doctest.h>
#include <mutex>
using namespace doctest;
struct MyXmlReporter : public IReporter
{
// caching pointers/references to objects of these types - safe to do
std::ostream& stdout_stream;
const ContextOptions& opt;
const TestCaseData* tc;
std::mutex mutex;
// constructor has to accept the ContextOptions by ref as a single argument
MyXmlReporter(const ContextOptions& in)
: stdout_stream(*in.cout)
, opt(in) {}
void report_query(const QueryData& /*in*/) override {}
void test_run_start() override {}
void test_run_end(const TestRunStats& /*in*/) override {}
void test_case_start(const TestCaseData& in) override { tc = &in; }
// called when a test case is reentered because of unfinished subcases
void test_case_reenter(const TestCaseData& /*in*/) override {}
void test_case_end(const CurrentTestCaseStats& /*in*/) override {}
void test_case_exception(const TestCaseException& /*in*/) override {}
void subcase_start(const SubcaseSignature& /*in*/) override {
std::lock_guard<std::mutex> lock(mutex);
}
void subcase_end() override {
std::lock_guard<std::mutex> lock(mutex);
}
void log_assert(const AssertData& in) override {
// don't include successful asserts by default - this is done here
// instead of in the framework itself because doctest doesn't know
// if/when a reporter/listener cares about successful results
if(!in.m_failed && !opt.success)
return;
// make sure there are no races - this is done here instead of in the
// framework itself because doctest doesn't know if reporters/listeners
// care about successful asserts and thus doesn't lock a mutex unnecessarily
std::lock_guard<std::mutex> lock(mutex);
// ...
}
void log_message(const MessageData& /*in*/) override {
// messages too can be used in a multi-threaded context - like asserts
std::lock_guard<std::mutex> lock(mutex);
// ...
}
void test_case_skipped(const TestCaseData& /*in*/) override {}
};
// "1" is the priority - used for ordering when multiple reporters are used
REGISTER_REPORTER("my_xml", 1, MyXmlReporter);
// registering the same class as a reporter and as a listener is nonsense but it's possible
REGISTER_LISTENER("my_listener", 1, MyXmlReporter);
```
Custom `IReporter` implementations must be registered with one of:
* `REGISTER_REPORTER`, for when the new reporter is an option that users may choose at run-time.
* `REGISTER_LISTENER`, for when the reporter is actually a listener and must always be executed, regardless of which reporters have been chosen at run-time.
Multiple reporters can be used at the same time - just specify them through the ```--reporters=...``` [**command line filtering option**](commandline.html) using commas to separate them like this: ```--reporters=myReporter,xml``` and their order of execution will be based on their priority - that is the number "1" in the case of the example reporter above (lower means earlier - the default console/xml reporters from the framework have 0 as their priority and negative numbers are accepted as well).
All registered listeners (```REGISTER_LISTENER```) will be executed before any reporter - they do not need to be specified and cannot be filtered through the command line.
When implementing a reporter users are advised to follow the comments from the example above and look at the few implemented reporters in the framework itself. Also check out the [**example**](../../examples/all_features/reporters_and_listeners.cpp).
---------------
[Home](readme.html#reference)
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