new system tests under BATS

Initial attempt at writing a framework for podman system tests.
The idea is to define a useful set of primitives that will
make it easy to write actual tests and to interpret results
of failing ones.

This is a proof-of-concept right now; only a small number of
tests, by no means comprehensive. I am requesting review in
order to find showstopper problems: reasons why this approach
cannot work. Should there be none, we can work toward running
these as gating tests for Fedora and RHEL8.

Signed-off-by: Ed Santiago <santiago@redhat.com>

test/system/001-basic.bats

@@ -0,0 +1,38 @@
+#!/usr/bin/env bats
+#
+# Simplest set of podman tests. If any of these fail, we have serious problems.
+#
+
+load helpers
+
+# Override standard setup! We don't yet trust podman-images or podman-rm
+function setup() {
+    :
+}
+
+@test "podman version emits reasonable output" {
+    run_podman version
+
+    is "${lines[0]}" "Version:[ ]\+[1-9][0-9.]\+" "Version line 1"
+
+    is "$output" ".*Go Version: \+"               "'Go Version' in output"
+
+    # FIXME: enable for 1.1
+#    is "$output" ".*RemoteAPI Version: \+"        "API version in output"
+}
+
+
+@test "podman can pull an image" {
+    run_podman pull $PODMAN_TEST_IMAGE_FQN
+}
+
+# This is for development only; it's intended to make sure our timeout
+# in run_podman continues to work. This test should never run in production
+# because it will, by definition, fail.
+@test "timeout" {
+    if [ -z "$PODMAN_RUN_TIMEOUT_TEST" ]; then
+        skip "define \$PODMAN_RUN_TIMEOUT_TEST to enable this test"
+    fi
+    PODMAN_TIMEOUT=10 run_podman run $PODMAN_TEST_IMAGE_FQN sleep 90
+    echo "*** SHOULD NEVER GET HERE"
+}