Special case --list-tests --verbosity quiet

The new output (mostly) follows the old `--list-test-names-only`
format, with the exception of no longer supporting line output
for `--verbosity high`.

Fixes #2051

src/catch2/interfaces/catch_interfaces_reporter.cpp

@@ -21,6 +21,24 @@
 
 namespace Catch {
 
+    namespace {
+        void listTestNamesOnly( std::vector<TestCaseHandle> const& tests ) {
+            for ( auto const& test : tests ) {
+                auto const& testCaseInfo = test.getTestCaseInfo();
+
+                if ( startsWith( testCaseInfo.name, '#' ) ) {
+                    Catch::cout() << '"' << testCaseInfo.name << '"';
+                } else {
+                    Catch::cout() << testCaseInfo.name;
+                }
+
+                Catch::cout() << '\n';
+            }
+            Catch::cout() << std::flush;
+        }
+    } // end unnamed namespace
+
+
     ReporterConfig::ReporterConfig( IConfig const* _fullConfig )
     :   m_stream( &_fullConfig->stream() ), m_fullConfig( _fullConfig ) {}
 
@@ -137,6 +155,14 @@ namespace Catch {
     }
 
     void IStreamingReporter::listTests(std::vector<TestCaseHandle> const& tests, IConfig const& config) {
+        // We special case this to provide the equivalent of old
+        // `--list-test-names-only`, which could then be used by the
+        // `--input-file` option.
+        if (config.verbosity() == Verbosity::Quiet) {
+            listTestNamesOnly(tests);
+            return;
+        }
+
         if (config.hasTestFilters()) {
             Catch::cout() << "Matching test cases:\n";
         } else {

tests/CMakeLists.txt

@@ -99,6 +99,15 @@ set_tests_properties(List::Tests::Output PROPERTIES
     PASS_REGULAR_EXPRESSION "[0-9]+ test cases"
     FAIL_REGULAR_EXPRESSION "Hidden Test"
 )
+# This should be equivalent to the old --list-test-names-only and be usable
+# with --input-file.
+add_test(NAME List::Tests::Quiet COMMAND $<TARGET_FILE:SelfTest> --list-tests --verbosity quiet)
+# Sadly we cannot ask for start-of-line and end-of-line in a ctest regex,
+# so we fail if we see space/tab at the start...
+set_tests_properties(List::Tests::Quiet PROPERTIES
+    PASS_REGULAR_EXPRESSION "\"#1905 -- test spec parser properly clears internal state between compound tests\"[\r\n]"
+    FAIL_REGULAR_EXPRESSION "[ \t]\"#1905 -- test spec parser properly clears internal state between compound tests\""
+)
 add_test(NAME List::Tests::ExitCode COMMAND $<TARGET_FILE:SelfTest> --list-tests --verbosity high)
 add_test(NAME List::Tests::XmlOutput COMMAND $<TARGET_FILE:SelfTest> --list-tests --verbosity high -r xml)
 set_tests_properties(List::Tests::XmlOutput PROPERTIES