Add initial upstream integration test

Re-use the test skeleton from cockpit. Just run a single integration
test for now, until we make them properly @nondestructive upstream [1].

Run chromium and the test directly on the test bed. For cockpit-podman
tests it's not practical to run them in a cockpit/tasks podman
container, as that container interferes too much with the tests.

[1] https://github.com/cockpit-project/cockpit-podman/pull/356

tests/.gitignore

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+*.retry
+artifacts/
+source/

tests/browser.sh

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+#!/bin/sh
+set -eux
+
+# from standard-test-source
+SOURCE="$(pwd)/source"
+LOGS="$(pwd)/logs"
+mkdir -p "$LOGS"
+chmod a+w "$LOGS"
+
+# create user account for logging in
+if ! id admin 2>/dev/null; then
+    useradd admin -G wheel
+    echo admin:foobar | chpasswd
+fi
+# avoid sudo lecture during tests
+su -c 'echo foobar | sudo --stdin whoami' - admin
+
+# disable core dumps, we rather investigate them upstream where test VMs are accessible
+echo core > /proc/sys/kernel/core_pattern
+
+# pull images for system podman tests
+podman pull docker.io/busybox
+podman pull docker.io/alpine
+podman pull docker.io/registry:2
+
+# pull images for user podman tests; podman insists on user session
+loginctl enable-linger $(id -u admin)
+sudo -i -u admin bash << EOF
+podman pull docker.io/busybox
+podman pull docker.io/alpine
+podman pull docker.io/registry:2
+EOF
+
+systemctl enable --now cockpit.socket io.podman.socket
+
+# tests need cockpit's bots/ libraries and test infrastructure
+cd $SOURCE
+git init
+make bots test/common
+
+# only install a subset to save time/space
+npm install chrome-remote-interface sizzle
+
+export TEST_OS=fedora-32
+export TEST_AUDIT_NO_SELINUX=1
+
+# run tests
+RC=0
+test/check-application -tv --machine 127.0.0.1:22 --browser 127.0.0.1:9090 TestApplication.testBasicSystem || { RC=$? ; cp --verbose Test* $LOGS || true; }
+
+# reset system changes from tests, for running this multiple times in a row
+rm -f /etc/systemd/system/cockpit.service.d/notls.conf
+systemctl daemon-reload
+systemctl stop cockpit.service
+
+exit $RC

tests/tests.yml

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+---
+- hosts: localhost
+  roles:
+  - role: standard-test-source
+    tags:
+    - always
+
+  - role: standard-test-basic
+    tags:
+    - classic
+    required_packages:
+    - cockpit-podman
+    - cockpit-ws
+    - chromium-headless
+    - git
+    - libvirt-python3
+    - make
+    - npm
+    - python3
+    tests:
+    - verify:
+        dir: .
+        run: ./browser.sh
+        save-files: ["logs/*"]