Build client in macro

crates/e2e/macro/src/codegen.rs

@@ -137,7 +137,7 @@ impl InkE2ETest {
 
         let client_building = match self.test.config.backend() {
             Backend::Full => build_full_client(&environment, contracts),
-            Backend::RuntimeOnly => todo!("Runtime-only backend not yet supported"),
+            Backend::RuntimeOnly => build_runtime_client(contracts),
         };
 
         quote! {
@@ -328,3 +328,13 @@ fn build_full_client<I: Iterator<Item = TokenStream2>>(
         ).await;
     }
 }
+
+fn build_runtime_client<I: Iterator<Item = TokenStream2>>(
+    contracts: I,
+) -> TokenStream2 {
+    quote! {
+        let mut client = ::ink_e2e::DrinkClient::new(
+            [ #( #contracts ),* ]
+        );
+    }
+}

crates/e2e/src/lib.rs

@@ -53,6 +53,7 @@ pub use subxt_client::{
     Client,
     Error,
 };
+pub use drink_client::Client as DrinkClient;
 pub use subxt_signer::sr25519::{
     self,
     dev::*,