Test cases fail on centos 7.2 gcc 8.31 in docker container

[marcpawl]

Create docker container based on centos 7.2
In container install devtoolset-8, cmake3

Makefile:
all: build_rhel72_64

src:
git clone -b v0.8.0 http://github.com/jupp0r/prometheus-cpp.git src
cd src && git submodule init && git submodule update

build_rhel72_64: src
(docker exec rhel72_64 make -C pwd rhel72_64) || (rm -rf build/rhel72_64 && false)

rhel72_64:
mkdir -p build/rhel72_64
source /opt/rh/devtoolset-8/enable &&
cd build/rhel72_64 &&
cmake3
-Dbenchmark_DIR=$(abspath ../../google-benchmark/rhel72_64/usr/local/lib64/cmake/benchmark/)
-G "Unix Makefiles"
../../src
source /opt/rh/devtoolset-8/enable &&
${MAKE} -C build/rhel72_64
source /opt/rh/devtoolset-8/enable &&
${MAKE} -C build/rhel72_64 test
source /opt/rh/devtoolset-8/enable &&
${MAKE} -C build/rhel72_64 DESTDIR=$(abspath rhel72_64) install

The tests fail:
make[1]: Entering directory '/home/mpawlowsky/r18_1_0_dcr/nb20200108.9999/all_3rdparty_NB/prometheus/prometheus-cpp-0.8.0/build/rhel72_64'
Running tests...
Test project /home/mpawlowsky/r18_1_0_dcr/nb20200108.9999/all_3rdparty_NB/prometheus/prometheus-cpp-0.8.0/build/rhel72_64
Start 1: prometheus_test
1/1 Test #1: prometheus_test ..................***Failed 22.20 sec

0% tests passed, 1 tests failed out of 1

Total Test time (real) = 22.20 sec

The following tests FAILED:
1 - prometheus_test (Failed)
Errors while running CTest
make[1]: *** [Makefile:130: test] Error 8

[gjasny]

Could you please run ctest with -V or run the test directly to see the output?
My bet would be the serialization test fails because your docker image lacks the de_DE locale.

[marcpawl]

Failing test case is:

1: [ RUN ] SerializerTest.shouldSerializeLocaleIndependent
1: unknown file: Failure
1: C++ exception with description "locale::facet::_S_create_c_locale name not valid" thrown in the test body.
1: [ FAILED ] SerializerTest.shouldSerializeLocaleIndependent (68 ms)

If the test case has a dependency on a locale, can the test case be skipped instead of failing.

[gjasny]

The problem with tests that automatically skip is that you can never be sure that they don't skip in CI.
If that's a problem in your setup maybe filtering the test with the GTEST_FILTER environment variable would help.