Add zombienet integration tests

.github/workflows/poc-zombienet.yml

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+name: PoC zombienet CI
+
+on:
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: build
+        run: |
+          yarn install --frozen-lockfile
+          yarn build
+      - name: Get zombienet
+        run: |
+          curl -L -O https://github.com/paritytech/zombienet/releases/download/v1.2.11/zombienet-linux
+          chmod +x zombienet-linux
+      - name: Get polkadot
+        run: |
+          curl -L -O https://github.com/paritytech/polkadot/releases/download/v0.9.15-1/polkadot
+          chmod +x polkadot
+      - name: Run test
+        run: |
+          export PATH=$(pwd):$PATH
+          echo "running on $(pwd)"
+          echo $PATH
+          ./zombienet-linux -p native test ./.zombienet-tests/0001-smoke-test.feature

.zombienet-tests/0001-custom.js

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+const { connect } = require("./utils")
+
+async function run(nodeName, networkInfo) {
+  const api = await connect(nodeName, networkInfo)
+  const decimals = api?.registry?.chainDecimals
+
+  return decimals[0]
+}
+
+module.exports = { run }

.zombienet-tests/0001-smoke-test.feature

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+Description: Smoke Test
+Network: ./0001-smoke-test.toml
+Creds: config
+
+
+alice: is up
+bob: is up
+alice: reports block height is at least 5 within 120 seconds
+alice: reports finalised height is at least 2 within 120 seconds
+alice: js-script ./0001-custom.js return is equal to 12 within 120 seconds
+bob: js-script ./0002-getHeaders.js return is greater than 1 within 120 seconds

.zombienet-tests/0001-smoke-test.toml

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+[settings]
+timeout = 240000
+
+[relaychain]
+default_image = "parity/polkadot:latest"
+chain = "dev"
+default_command = "polkadot"
+
+  [[relaychain.nodes]]
+  name = "alice"
+  validator = true
+  extra_args = [ "--alice" ]
+  add_to_bootnodes = true
+
+  [[relaychain.nodes]]
+  name = "bob"
+  validator = true
+  extra_args = [ "--bob" ]
+  add_to_bootnodes = true

.zombienet-tests/0002-getHeaders.js

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+const { connect } = require("./utils")
+
+async function run(nodeName, networkInfo) {
+  const api = await connect(nodeName, networkInfo)
+  // add 20s sleep to give time to sync
+  await new Promise((resolve) => setTimeout(resolve, 10000))
+  let count = 0
+  try {
+    await new Promise(async (resolve, reject) => {
+      const unsub = await api.rpc.chain.subscribeNewHeads((header) => {
+        if (++count === 2) {
+          unsub()
+          resolve()
+        }
+      })
+    })
+  } catch (error) {
+    // DEBUG
+    console.log("error", error)
+  }
+
+  return count
+}
+
+module.exports = { run }

.zombienet-tests/utils.js

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+const polkadotApi = require("@polkadot/api")
+
+async function connect(nodeName, networkInfo) {
+  const { userDefinedTypes } = networkInfo.nodesByName[nodeName]
+  const customChainSpec = require(networkInfo.chainSpecPath)
+  console.log("bootnodes", customChainSpec.bootNodes)
+  const substrateConnect = await import("@substrate/connect")
+  const provider = new substrateConnect.ScProvider(
+    JSON.stringify(customChainSpec),
+  )
+  const api = new polkadotApi.ApiPromise({ provider, types: userDefinedTypes })
+  return api
+}
+
+module.exports = { connect }