Add Docker-based test runner

Author: shesek

tests/package.json

@@ -2,7 +2,8 @@
   "name": "esplora-tests",
   "scripts": {
     "test": "cypress run",
-    "test:runner": "cypress open"
+    "test:runner": "cypress open",
+    "test:docker": "./run-docker.sh"
   },
   "dependencies": {
     "bitcoin-core": "^3.0.0",

tests/run-docker.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+set -eo pipefail
+
+# Cleanup on exit
+trap 'docker stop esplora-tests-explorer || true; [ -n "$datadir" ] && rm -rf "$datadir" || true' EXIT
+
+# Build the Esplora docker image
+(
+    cd ..
+    [ -n "$SKIP_BUILD_BASE" ]  || docker build -t blockstream/esplora-base:latest -f Dockerfile.deps .
+    [ -n "$SKIP_BUILD_IMAGE" ] || docker build -t esplora .
+)
+
+# Run Esplora/Electrs in regtest mode
+datadir=$(mktemp -d /tmp/esplora-tests.XXXXX)
+docker run -v $datadir:/data --rm -t --name esplora-tests-explorer \
+  -v $HOME/workspace/blockstream/esplora/run.sh:/srv/explorer/run.sh \
+  -e EXPOSE_BITCOIND_RPC=1 \
+  esplora bash -c "/srv/explorer/run.sh bitcoin-regtest explorer" \
+  &
+sleep 1
+
+cont_ip=$(docker inspect esplora-tests-explorer | jq -r '.[0].NetworkSettings.IPAddress')
+export BASE_URL=http://$cont_ip/regtest
+
+# Wait for the HTTP REST API to become available
+while ! curl $BASE_URL/api/blocks/tip/height; do
+  sleep 0.5
+done
+
+# Load the default wallet (needed for the Cypress tests)
+docker exec esplora-tests-explorer cli -rpcwait loadwallet default
+
+# Grab the bitcoin cookie
+bitcoind_cookie=$(docker exec esplora-tests-explorer cat /data/bitcoin/regtest/.cookie)
+export BITCOIND_URL=http://$bitcoind_cookie@$cont_ip:18443/
+
+# Build Cypress and run the tests
+docker build -t esplora-tests-cypress .
+docker run -it --rm \
+  -v $PWD/cypress/videos:/tests/cypress/videos -v $PWD/cypress/screenshots:/tests/cypress/screenshots \
+  -e BASE_URL -e BITCOIND_URL \
+  esplora-tests-cypress
+
+# TODO exit with an error code if the tests fail