Add integration test #119

Job	Run time
build-and-test-windows (Debug, windows-latest)	2m 57s
build-and-test-windows (Release, windows-latest)	2m 46s
integration-tests	1m 50s
build-and-test-mingw (Release, clang++, windows-latest)	2m 18s
build-and-test-mingw (Release, g++, windows-latest)	2m 44s
build-and-test-mingw (Debug, g++, windows-latest)	2m 52s
build-and-test-unix (Debug, g++, ubuntu-latest)	1m 16s
build-and-test-mingw (Debug, clang++, windows-latest)	2m 18s
build-and-test-unix (Release, clang++, macos-latest)	2m 10s
build-and-test-unix (Release, g++, macos-latest)	1m 44s
build-and-test-unix (Debug, clang++, macos-latest)	1m 36s
build-and-test-unix (Release, g++, ubuntu-latest)	2m 4s
build-and-test-unix (Debug, g++, macos-latest)	1m 48s
build-and-test-unix (Release, clang++, ubuntu-latest)	2m 7s
build-and-test-unix (Debug, clang++, ubuntu-latest)	1m 38s
	32m 8s

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