test: cleaning up circuits test setup

yarn-project/circuits.js/src/structs/kernel/private_kernel.ts

@@ -1,4 +1,4 @@
-import { Fr } from '@aztec/foundation/fields';
+import { Fr, GrumpkinScalar } from '@aztec/foundation/fields';
 import { BufferReader, Tuple, serializeToBuffer } from '@aztec/foundation/serialize';
 import { FieldsOf } from '@aztec/foundation/types';
 
@@ -148,6 +148,16 @@ export class PrivateKernelInputsInit {
   toBuffer() {
     return serializeToBuffer(this.txRequest, this.privateCall);
   }
+
+  /**
+   * Deserializes from a buffer or reader.
+   * @param buffer - Buffer or reader to read from.
+   * @returns The deserialized instance.
+   */
+  static fromBuffer(buffer: Buffer | BufferReader): PrivateKernelInputsInit {
+    const reader = BufferReader.asReader(buffer);
+    return new PrivateKernelInputsInit(reader.readObject(TxRequest), reader.readObject(PrivateCallData));
+  }
 }
 
 /**
@@ -239,4 +249,23 @@ export class PrivateKernelInputsOrdering {
       this.masterNullifierSecretKeys,
     );
   }
+
+  /**
+   * Deserializes from a buffer or reader.
+   * @param buffer - Buffer or reader to read from.
+   * @returns The deserialized instance.
+   */
+  static fromBuffer(buffer: Buffer | BufferReader): PrivateKernelInputsOrdering {
+    const reader = BufferReader.asReader(buffer);
+    return new PrivateKernelInputsOrdering(
+      reader.readObject(PreviousKernelData),
+      reader.readArray(MAX_NEW_COMMITMENTS_PER_TX, SideEffect),
+      reader.readNumbers(MAX_NEW_COMMITMENTS_PER_TX),
+      reader.readArray(MAX_READ_REQUESTS_PER_TX, Fr),
+      reader.readArray(MAX_NEW_NULLIFIERS_PER_TX, SideEffectLinkedToNoteHash),
+      reader.readNumbers(MAX_NEW_NULLIFIERS_PER_TX),
+      reader.readArray(MAX_NEW_NULLIFIERS_PER_TX, Fr),
+      reader.readArray(MAX_NULLIFIER_KEY_VALIDATION_REQUESTS_PER_TX, GrumpkinScalar),
+    );
+  }
 }

yarn-project/end-to-end/src/e2e_nested_contract.test.ts

@@ -36,12 +36,32 @@ describe('e2e_nested_contract', () => {
         .wait();
 
       if (isGenerateTestDataEnabled()) {
-        const privateKernelInputs = getTestData('private-kernel-inputs-inner');
-        const nestedCallPrivateKernelInput = privateKernelInputs[privateKernelInputs.length - 1];
-        writeFileSync(
-          '../noir-protocol-circuits/src/fixtures/nested-call-private-kernel-inner.hex',
-          nestedCallPrivateKernelInput.toBuffer().toString('hex'),
-        );
+        {
+          const privateKernelInputsInit = getTestData('private-kernel-inputs-init');
+          const nestedCallPrivateKernelInput = privateKernelInputsInit[0];
+          writeFileSync(
+            '../noir-protocol-circuits/src/fixtures/nested-call-private-kernel-init.hex',
+            nestedCallPrivateKernelInput.toBuffer().toString('hex'),
+          );
+        }
+
+        {
+          const privateKernelInputsInner = getTestData('private-kernel-inputs-inner');
+          const nestedCallPrivateKernelInput = privateKernelInputsInner[privateKernelInputsInner.length - 1];
+          writeFileSync(
+            '../noir-protocol-circuits/src/fixtures/nested-call-private-kernel-inner.hex',
+            nestedCallPrivateKernelInput.toBuffer().toString('hex'),
+          );
+        }
+
+        {
+          const privateKernelInputsOrdering = getTestData('private-kernel-inputs-ordering');
+          const nestedCallPrivateKernelInput = privateKernelInputsOrdering[0];
+          writeFileSync(
+            '../noir-protocol-circuits/src/fixtures/nested-call-private-kernel-ordering.hex',
+            nestedCallPrivateKernelInput.toBuffer().toString('hex'),
+          );
+        }
       }
     }, 100_000);
 

yarn-project/foundation/src/serialize/buffer_reader.ts

@@ -54,6 +54,16 @@ export class BufferReader {
     return this.buffer.readUint32BE(this.index - 4);
   }
 
+  /**
+   * Reads `count` 32-bit unsigned integers from the buffer at the current index position.
+   * @param count - The number of 32-bit unsigned integers to read.
+   * @returns An array of 32-bit unsigned integers.
+   */
+  public readNumbers<N extends number>(count: N): Tuple<number, N> {
+    const result = Array.from({ length: count }, () => this.readNumber());
+    return result as Tuple<number, N>;
+  }
+
   /**
    * Reads a 16-bit unsigned integer from the buffer at the current index position.
    * Updates the index position by 2 bytes after reading the number.