Combine all tests into one munged coverage report

[edwardbr]

Hi for legacy reasons we have numerous unit tests that cover different bits of code on the same code base, unfortunately this then means that we have no global view of what areas of our code base have not been covered.

To solve this I hacked your app to do this munging changing this
` Plugin::CoverageData CoverageDataMerger::Merge(
const std::vectorPlugin::CoverageData& coverageDataCollection) const
{
auto coverageData = CreateCoverageData(coverageDataCollection);

	std::map<fs::path, std::vector<Plugin::ModuleCoverage*>> modulesByPath =
		GroupChildrenByKey<Plugin::CoverageData, fs::path, Plugin::ModuleCoverage>(
			coverageDataCollection,
			[](const Plugin::CoverageData& data) -> const Plugin::CoverageData::T_ModuleCoverageCollection& { return data.GetModules(); },
			[](const Plugin::ModuleCoverage& module) -> const fs::path& { return module.GetPath(); });
	
	for (const auto& pair : modulesByPath)
	{
		auto& module = coverageData.AddModule(pair.first);
		FillModule(module, pair.second);
	}
	
	return coverageData;
}`

to this:
` Plugin::CoverageData CoverageDataMerger::Merge(
const std::vectorPlugin::CoverageData& coverageDataCollection) const
{
auto coverageData = CreateCoverageData(coverageDataCollection);
fs::path global_path("Global");

	std::map<fs::path, std::vector<Plugin::ModuleCoverage*>> modulesByPath =
		GroupChildrenByKey<Plugin::CoverageData, fs::path, Plugin::ModuleCoverage>(
			coverageDataCollection,
			[](const Plugin::CoverageData& data) -> const Plugin::CoverageData::T_ModuleCoverageCollection& { return data.GetModules(); },
			[&](const Plugin::ModuleCoverage& module) -> const fs::path& { return global_path; });
	
	for (const auto& pair : modulesByPath)
	{
		auto& module = coverageData.AddModule(pair.first);
		FillModule(module, pair.second);
	}
	
	return coverageData;
}`	

I am testing it now I hope it works however, it would be very nice if we could have a --munge type command line parameter so that we could do this in one app.

[huaxing-w]

Sorry I might not understand this correctly, why don't you use the opencpp the merge function to do that?
I am actually having the same problem recently!

OpenCppCoverage --sources=MySources --export_type=binary:Test1.cov -- Test1.exe
OpenCppCoverage --sources=MySources --export_type=binary:Test2.cov -- Test2.exe
OpenCppCoverage.exe --sources=MySources --input_coverage=Test1.cov --input_coverage=Test2.cov  -- Test3.exe