Add --interactive mode to docker-tests for testing of interactive commands (#312)

* Add --interactive mode to docker-tests to facilitate interactive testing
of innernet commands.

* Add a section to README about testing.

* Fix href tag

README.md

@@ -253,6 +253,19 @@ cargo build --release --bin innernet
 
 The resulting binary will be located at `./target/release/innernet`
 
+### Testing
+
+You can manually invoke Docker-based tests assuming you have Docker daemon running. If you specify
+`--interactive` flag, it allows you to attach to the server and client innernet Docker
+containers, so you can test various innernet commands inside a sandboxed environment.
+
+```
+docker-tests/build-docker-images.sh
+docker-tests/run-docker-tests.sh [--interactive]
+```
+
+If you are developing a new feature, please consider adding a new test case to `run-docker-tests.sh` ([example PR](https://github.com/tonarino/innernet/pull/310/files#diff-5d47ea0d379e45f35471e2afa48fdba09d2ca4bcf090e16bb1adccebea080081)).
+
 ### Releases
 
 Please run the release script from a Linux machine: generated shell completions depend on available wireguard backends and Mac doesn't support the `kernel` backend. 

docker-tests/run-docker-tests.sh

@@ -8,14 +8,19 @@ cd "$SELF_DIR/.."
 help() {
     cat >&2 <<-_EOF
 Usage: "${0##*/}" [options...] (<test>)
- --userspace  Use userspace wireguard instead of kernel one
+ --interactive  Enter interactive mode, providing a chance to attach to innernet docker containers
- --verbose    Print verbose innernet logs
+ --userspace    Use userspace wireguard instead of kernel one
+ --verbose      Print verbose innernet logs
 _EOF
 }
 
 TEST_FILTER=()
 while [[ $# -gt 0 ]]; do
   case $1 in
+    --interactive)
+        INTERACTIVE=true
+        shift
+        ;;
     --userspace)
         INNERNET_ARGS="$INNERNET_ARGS --backend userspace"
         shift
@@ -135,6 +140,18 @@ cmd docker cp "$tmp_dir/peer2.toml" "$PEER2_CONTAINER:/app/invite.toml"
 cmd docker start -a "$PEER2_CONTAINER" | sed -e 's/^/\x1B[0;93mpeer 2\x1B[0m: /' &
 sleep 10
 
+if [[ $INTERACTIVE == true ]]; then
+    info "Open a new terminal and connect to one of the docker containers to test innernet commands."
+    info ""
+    info "Server:"
+    info "  docker exec -it ${SERVER_CONTAINER:0:12} bash"
+    info "Admin client:"
+    info "  docker exec -it ${PEER1_CONTAINER:0:12} bash"
+    info "Non-admin client:"
+    info "  docker exec -it ${PEER2_CONTAINER:0:12} bash"
+    wait
+fi
+
 test_short_lived_invitation() {
     info "Creating short-lived invitation for third peer."
     cmd docker exec "$PEER1_CONTAINER" innernet \