Add assert that port 8081 is not in use

Cargo.toml

@@ -45,6 +45,7 @@ log = "0.4"
 mockall = "0.11.4"
 mongodb = "2.3.1"
 petgraph = "0.6"
+port_check = "0.2.1"
 ps_sig = { git = "https://github.com/alan-turing-institute/RSS.git", rev = "ec9386e125d87c5f54898b34fbe0883b3b36ffd4" }
 qrcode = "0.12.0"
 rand = "0.8"

README.md

@@ -38,7 +38,7 @@ cargo build
 ```
 Install the Trustchain CLI with:
 ```shell
-cargo install --path trustchain-cli
+cargo install --path crates/trustchain-cli
 ```
 
 ## Usage Guide

crates/trustchain-http/Cargo.toml

@@ -44,4 +44,5 @@ trustchain-ion = { path = "../trustchain-ion" }
 axum-test-helper = { workspace = true }
 itertools = { workspace = true }
 mockall = { workspace = true }
+port_check = { workspace = true }
 tempfile = { workspace = true }

crates/trustchain-http/tests/attestation.rs

@@ -1,4 +1,5 @@
-/// Integration test for attestation challenge-response process.
+//! Integration test for attestation challenge-response process.
+use port_check::is_port_reachable;
 use tokio::runtime::Runtime;
 use trustchain_core::verifier::Verifier;
 use trustchain_http::attestation_encryption_utils::{josekit_to_ssi_jwk, ssi_to_josekit_jwk};
@@ -27,6 +28,10 @@ pub trait AttestationUtils {
 
 fn init_http() {
     init();
+    assert!(
+        !is_port_reachable("127.0.0.1:8081"),
+        "Port 8081 is required for Challenge-Response integration test but 8081 is already in use."
+    );
     let http_config = HTTPConfig {
         host: "127.0.0.1".parse().unwrap(),
         port: 8081,