testing: Add long running light client flag and cfg aliases

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

testing/integration-tests/Cargo.toml

@@ -18,6 +18,9 @@ default = []
 # Enable to run the tests with Light Client support.
 unstable-light-client = ["subxt/unstable-light-client"]
 
+# Enable to run the full-client tests with Light Client support.
+unstable-light-client-long-running = ["subxt/unstable-light-client"]
+
 # Enable this to use the unstable backend in tests _instead of_
 # the default one which relies on the "old" RPC methods.
 unstable-backend-client = []
@@ -43,3 +46,6 @@ tracing = { workspace = true }
 tracing-subscriber = { workspace = true }
 wabt = { workspace = true }
 substrate-runner = { workspace = true }
+
+[build-dependencies]
+cfg_aliases = "0.2.0"

testing/integration-tests/build.rs

@@ -0,0 +1,9 @@
+use cfg_aliases::cfg_aliases;
+
+fn main() {
+    // Setup cfg aliases
+    cfg_aliases! {
+        lightclient: { any(feature = "unstable-light-client", feature = "unstable-light-client-long-running") },
+        fullclient: { all(not(feature = "unstable-light-client"), not(feature = "unstable-light-client-long-running")) },
+    }
+}