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Fix potential infinite loops in generators combined with section filter
The problem was that under specific circumstances, namely that none of their children progressed, `GeneratorTracker` will not progress. This was changed recently, to allow for code like this, where a `SECTION` follows a `GENERATE` at the same level: ```cpp SECTION("A") {} auto a = GENERATE(1, 2); SECTION("B") {} ``` However, this interacted badly with `SECTION` filters (`-c foo`), as they could deactivate all `SECTION`s below a generator, and thus stop it from progressing forever. This commit makes GeneratorTracker check whether there are any filters active, and if they are, it checks whether its section-children can ever run. Fixes #2025
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@ -71,13 +71,53 @@ namespace Catch {
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// `SECTION`s.
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// **The check for m_children.empty cannot be removed**.
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// doing so would break `GENERATE` _not_ followed by `SECTION`s.
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const bool should_wait_for_child =
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!m_children.empty() &&
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std::find_if( m_children.begin(),
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m_children.end(),
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[]( TestCaseTracking::ITrackerPtr tracker ) {
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return tracker->hasStarted();
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} ) == m_children.end();
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const bool should_wait_for_child = [&]() {
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// No children -> nobody to wait for
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if ( m_children.empty() ) {
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return false;
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}
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// If at least one child started executing, don't wait
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if ( std::find_if(
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m_children.begin(),
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m_children.end(),
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[]( TestCaseTracking::ITrackerPtr tracker ) {
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return tracker->hasStarted();
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} ) != m_children.end() ) {
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return false;
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}
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// No children have started. We need to check if they _can_
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// start, and thus we should wait for them, or they cannot
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// start (due to filters), and we shouldn't wait for them
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auto* parent = m_parent;
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// This is safe: there is always at least one section
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// tracker in a test case tracking tree
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while ( !parent->isSectionTracker() ) {
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parent = &( parent->parent() );
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}
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assert( parent &&
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"Missing root (test case) level section" );
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auto const& parentSection =
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static_cast<SectionTracker&>( *parent );
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auto const& filters = parentSection.getFilters();
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// No filters -> no restrictions on running sections
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if ( filters.empty() ) {
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return true;
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}
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for ( auto const& child : m_children ) {
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if ( child->isSectionTracker() &&
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std::find( filters.begin(),
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filters.end(),
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static_cast<SectionTracker&>( *child )
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.trimmedName() ) !=
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filters.end() ) {
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return true;
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}
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}
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return false;
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}();
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// This check is a bit tricky, because m_generator->next()
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// has a side-effect, where it consumes generator's current
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@ -233,6 +233,14 @@ namespace TestCaseTracking {
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m_filters.insert( m_filters.end(), filters.begin()+1, filters.end() );
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}
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std::vector<std::string> const& SectionTracker::getFilters() const {
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return m_filters;
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}
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std::string const& SectionTracker::trimmedName() const {
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return m_trimmed_name;
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}
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} // namespace TestCaseTracking
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using TestCaseTracking::ITracker;
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@ -163,6 +163,10 @@ namespace TestCaseTracking {
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void addInitialFilters( std::vector<std::string> const& filters );
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void addNextFilters( std::vector<std::string> const& filters );
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//! Returns filters active in this tracker
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std::vector<std::string> const& getFilters() const;
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//! Returns whitespace-trimmed name of the tracked section
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std::string const& trimmedName() const;
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};
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} // namespace TestCaseTracking
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@ -419,6 +419,33 @@ set_tests_properties(FilteredSection-1 PROPERTIES FAIL_REGULAR_EXPRESSION "No te
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add_test(NAME FilteredSection-2 COMMAND $<TARGET_FILE:SelfTest> \#1394\ nested -c NestedRunSection -c s1)
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set_tests_properties(FilteredSection-2 PROPERTIES FAIL_REGULAR_EXPRESSION "No tests ran")
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add_test(
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NAME
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FilteredSection::GeneratorsDontCauseInfiniteLoop-1
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COMMAND
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$<TARGET_FILE:SelfTest> "#2025: original repro" -c "fov_0"
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)
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set_tests_properties(FilteredSection::GeneratorsDontCauseInfiniteLoop-1
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PROPERTIES
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PASS_REGULAR_EXPRESSION "inside with fov: 0" # This should happen
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FAIL_REGULAR_EXPRESSION "inside with fov: 1" # This would mean there was no filtering
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)
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# GENERATE between filtered sections (both are selected)
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add_test(
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NAME
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FilteredSection::GeneratorsDontCauseInfiniteLoop-2
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COMMAND
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$<TARGET_FILE:SelfTest> "#2025: same-level sections"
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-c "A"
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-c "B"
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)
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set_tests_properties(FilteredSection::GeneratorsDontCauseInfiniteLoop-2
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PROPERTIES
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PASS_REGULAR_EXPRESSION "All tests passed \\(4 assertions in 1 test case\\)"
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)
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# AppVeyor has a Python 2.7 in path, but doesn't have .py files as autorunnable
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add_test(NAME ApprovalTests COMMAND ${PYTHON_EXECUTABLE} ${CATCH_DIR}/scripts/approvalTests.py $<TARGET_FILE:SelfTest>)
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set_tests_properties(ApprovalTests PROPERTIES FAIL_REGULAR_EXPRESSION "Results differed")
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@ -402,3 +402,28 @@ TEST_CASE("#1514: stderr/stdout is not captured in tests aborted by an exception
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// FAIL aborts the test by throwing a Catch exception
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FAIL("1514");
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}
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TEST_CASE( "#2025: -c shouldn't cause infinite loop", "[sections][generators][regression][.approvals]" ) {
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SECTION( "Check cursor from buffer offset" ) {
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auto bufPos = GENERATE_REF( range( 0, 44 ) );
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WHEN( "Buffer position is " << bufPos ) { REQUIRE( 1 == 1 ); }
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}
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}
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TEST_CASE("#2025: original repro", "[sections][generators][regression][.approvals]") {
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auto fov = GENERATE(true, false);
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DYNAMIC_SECTION("fov_" << fov) {
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std::cout << "inside with fov: " << fov << '\n';
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}
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}
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TEST_CASE("#2025: same-level sections", "[sections][generators][regression][.approvals]") {
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SECTION("A") {
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SUCCEED();
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}
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auto i = GENERATE(1, 2, 3);
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SECTION("B") {
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REQUIRE(i < 4);
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}
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}
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