Normalize C++ namespace in JUnit's reporter classname field

Closes #2468

src/catch2/reporters/catch_reporter_junit.cpp

@@ -67,6 +67,15 @@ namespace Catch {
             return rss.str();
         }
 
+        static void normalizeNamespaceMarkers(std::string& str) {
+            std::size_t pos = str.find( "::" );
+            while ( pos != str.npos ) {
+                str.replace( pos, 2, "." );
+                pos += 1;
+                pos = str.find( "::", pos );
+            }
+        }
+
     } // anonymous namespace
 
     JunitReporter::JunitReporter( ReporterConfig&& _config )
@@ -170,6 +179,8 @@ namespace Catch {
         if ( !m_config->name().empty() )
             className = static_cast<std::string>(m_config->name()) + '.' + className;
 
+        normalizeNamespaceMarkers(className);
+
         writeSection( className, "", rootSection, stats.testInfo->okToFail() );
     }
 

tests/CMakeLists.txt

@@ -553,6 +553,17 @@ set_tests_properties("Colours::ColourModeCanBeExplicitlySetToAnsi"
     PASS_REGULAR_EXPRESSION "\\[1\;32mAll tests passed"
 )
 
+add_test(NAME "Reporters::JUnit::NamespacesAreNormalized"
+  COMMAND
+    $<TARGET_FILE:SelfTest>
+      --reporter junit
+      "A TEST_CASE_METHOD testing junit classname normalization"
+)
+set_tests_properties("Reporters::JUnit::NamespacesAreNormalized"
+  PROPERTIES
+    PASS_REGULAR_EXPRESSION "testcase classname=\"SelfTest(\.exe)?\\.A\\.B\\.TestClass\""
+)
+
 if (CATCH_ENABLE_CONFIGURE_TESTS)
     foreach(testName "DefaultReporter" "Disable" "DisableStringification"
                      "ExperimentalRedirect")

tests/SelfTest/UsageTests/Class.tests.cpp

@@ -114,4 +114,20 @@ namespace Inner
     {
         REQUIRE(Template_Fixture_2<TestType>{}.m_a.size() < 2);
     }
+} // namespace
+
+
+// We want a class in nested namespace so we can test JUnit's classname normalization.
+namespace {
+    namespace A {
+        namespace B {
+            class TestClass {};
+        }
+    }
+} // namespace
+
+TEST_CASE_METHOD( A::B::TestClass,
+                  "A TEST_CASE_METHOD testing junit classname normalization",
+                  "[class][approvals]" ) {
+    SUCCEED();
 }