feat: add fund to multisig rune (#939)

examples/multisig/basic.eg.ts

@@ -3,7 +3,6 @@
  * @stability unstable
  * @description Create a multisig account and ratify a vote to execute a transfer from
  * that multisig.
- * @test_skip
  */
 
 import { polkadotDev } from "@capi/polkadot-dev"
@@ -31,11 +30,8 @@ const davidFreeInitial = await davidFree.run()
 console.log("David free initial:", davidFreeInitial)
 
 /// Transfer initial funds to the multisig (existential deposit).
-await polkadotDev.Balances
-  .transfer({
-    value: 2_000_000_000_000n,
-    dest: multisig.address,
-  })
+await multisig
+  .fund(2_000_000_000_000n)
   .signed(signature({ sender: alexa }))
   .sent()
   .dbgStatus("Existential deposit:")

examples/multisig/stash.eg.ts

@@ -3,7 +3,6 @@
  * @stability unstable
  * @description Administrate a stash account (pure proxy) through a multisig with
  * three signatories.
- * @test_skip
  */
 
 import { MultiAddress, polkadotDev } from "@capi/polkadot-dev"
@@ -22,11 +21,8 @@ const multisig = MultisigRune.from(polkadotDev, {
 })
 
 /// Send funds to the multisig (existential deposit).
-await polkadotDev.Balances
-  .transfer({
-    value: 20_000_000_000_000n,
-    dest: multisig.address,
-  })
+await multisig
+  .fund(20_000_000_000_000n)
   .signed(signature({ sender: alexa }))
   .sent()
   .dbgStatus("Existential deposit:")

examples/multisig/virtual.eg.ts

@@ -15,8 +15,6 @@
  * To edit a virtual multisig, its members can propose the creation of a new multisig,
  * comprised of proxy accounts corresponding to its new members. Finally, the current
  * members ratify a call to give ownership of the stash account to the new multisig.
- *
- * @test_skip
  */
 
 import { MultiAddress, polkadotDev } from "@capi/polkadot-dev"

patterns/multisig/MultisigRune.ts

@@ -84,6 +84,21 @@ export class MultisigRune<out C extends Chain, out U> extends PatternRune<Multis
     )
   }
 
+  fund<X>(...[amount]: RunicArgs<X, [amount: bigint]>) {
+    return this.chain.extrinsic(
+      Rune
+        .object({
+          type: "Balances",
+          value: Rune.object({
+            type: "transfer",
+            dest: this.address,
+            value: amount,
+          }),
+        })
+        .unsafeAs<Chain.Call<C>>(),
+    )
+  }
+
   maybeTimepoint<X>(
     ...[callHash, blockHash]: RunicArgs<X, [callHash: Uint8Array, blockHash?: string]>
   ) {