Increase timing window for min duration tests to 1s

This test tends to be brittle on Mac CI machines, which are
heavily loaded and bursty. Since the tests are only run as part
of the "extra tests" test set, this increase should not have
a significant impact on the total duration of CI runs.

.github/workflows/linux-builds.yml

@@ -38,6 +38,17 @@ jobs:
             std: 14
             other_pkgs: clang-10
             surrogates: ON
+        # Clang 10 + C++17
+          - cxx: clang++-10
+            build_type: Debug
+            std: 17
+            other_pkgs: clang-10
+            surrogates: OFF
+          - cxx: clang++-10
+            build_type: Release
+            std: 17
+            other_pkgs: clang-10
+            surrogates: OFF
 
     steps:
     - uses: actions/checkout@v2
@@ -53,9 +64,13 @@ jobs:
       # Note: $GITHUB_WORKSPACE is distinct from ${{runner.workspace}}.
       #       This is important
       run: |
-        cmake -Bbuild -H$GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=${{matrix.build_type}} \
-              -DCMAKE_CXX_STANDARD=${{matrix.std}} -DCATCH_DEVELOPMENT_BUILD=ON \
-              -DCATCH_BUILD_SURROGATES=${{matrix.surrogates}} -G Ninja
+        cmake -Bbuild -H$GITHUB_WORKSPACE \
+              -DCMAKE_BUILD_TYPE=${{matrix.build_type}} \
+              -DCMAKE_CXX_STANDARD=${{matrix.std}} \
+              -DCMAKE_CXX_EXTENSIONS=OFF \
+              -DCATCH_DEVELOPMENT_BUILD=ON \
+              -DCATCH_BUILD_SURROGATES=${{matrix.surrogates}} \
+              -G Ninja
 
     - name: Build tests + lib
       working-directory: ${{runner.workspace}}/build

tests/ExtraTests/CMakeLists.txt

@@ -11,11 +11,11 @@ message( STATUS "Extra tests included" )
 # The MinDuration reporting tests do not need separate compilation, but
 # they have non-trivial execution time, so they are categorized as
 # extra tests, so that they are run less.
-add_test(NAME MinDuration::SimpleThreshold COMMAND $<TARGET_FILE:SelfTest> --min-duration 0.245 [min_duration_test])
+add_test(NAME MinDuration::SimpleThreshold COMMAND $<TARGET_FILE:SelfTest> --min-duration 0.950 [min_duration_test])
 set_tests_properties(
     MinDuration::SimpleThreshold
   PROPERTIES
-    PASS_REGULAR_EXPRESSION "s: sleep_for_250ms"
+    PASS_REGULAR_EXPRESSION "s: sleep_for_1000ms"
     FAIL_REGULAR_EXPRESSION "sleep_for_100ms"
     RUN_SERIAL ON  # The test is timing sensitive, so we want to run it
     # serially to avoid false positives on oversubscribed machines

tests/SelfTest/TimingTests/Sleep.tests.cpp

@@ -16,8 +16,8 @@ TEST_CASE( "sleep_for_100ms", "[.min_duration_test][approvals]" )
   CHECK( true );
 }
 
-TEST_CASE( "sleep_for_250ms", "[.min_duration_test][approvals]" )
+TEST_CASE( "sleep_for_1000ms", "[.min_duration_test][approvals]" )
 {
-  std::this_thread::sleep_for( std::chrono::milliseconds( 250 ) );
+  std::this_thread::sleep_for( std::chrono::milliseconds( 1'000 ) );
   CHECK( true );
 }