feat: Migrate the init kernel CPP tests to noir (#3091)

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including relevant motivation and context.

# Checklist:
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- [ ] If the pull request requires a cryptography review (e.g.
cryptographic algorithm implementations) I have added the 'crypto' tag.
- [ ] I have reviewed my diff in github, line by line and removed
unexpected formatting changes, testing logs, or commented-out code.
- [ ] Every change is related to the PR description.
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this pull request to relevant issues (if any exist).

yarn-project/noir-private-kernel/package.json

@@ -14,6 +14,7 @@
     "formatting:fix": "run -T prettier -w ./src",
     "noir:build": "cd src && nargo compile --no-backend && rm -rf ./target/debug_*",
     "noir:types": "yarn ts-node --esm src/scripts/generate_ts_from_abi.ts",
+    "noir:test": "cd src && nargo test",
     "test": "NODE_NO_WARNINGS=1 node --experimental-vm-modules $(yarn bin jest) --passWithNoTests"
   },
   "inherits": [
@@ -38,11 +39,15 @@
     "tslib": "^2.4.0"
   },
   "devDependencies": {
+    "@aztec/merkle-tree": "workspace:^",
+    "@aztec/types": "workspace:^",
     "@jest/globals": "^29.5.0",
     "@rushstack/eslint-patch": "^1.1.4",
     "@types/jest": "^29.5.0",
     "@types/node": "^18.7.23",
     "jest": "^29.5.0",
+    "levelup": "^5.1.1",
+    "memdown": "^6.1.1",
     "ts-jest": "^29.1.0",
     "ts-node": "^10.9.1",
     "typescript": "^5.0.4"

yarn-project/noir-private-kernel/src/crates/private-kernel-lib/src/lib.nr

@@ -20,11 +20,10 @@ mod private_kernel_init;
 mod private_kernel_inner;
 mod private_kernel_ordering;
 
+mod tests;
+
 use abis::kernel_circuit_public_inputs::{ KernelCircuitPublicInputs, KernelCircuitPublicInputsFinal };
 use private_kernel_init::PrivateKernelInputsInit;
 use private_kernel_inner::PrivateKernelInputsInner;
 use private_kernel_ordering::PrivateKernelInputsOrdering;
 
-// Hmm
-// PrivateCircuitPublicInputs vs CombinedAccumulatedData (Duplicated fields)
-// ?Que es la diferencia entre contract_address y storage_address?

yarn-project/noir-private-kernel/src/crates/private-kernel-lib/src/tests.nr

@@ -0,0 +1,3 @@
+mod testing_harness;
+mod apps;
+mod read_requests;

yarn-project/noir-private-kernel/src/crates/private-kernel-lib/src/tests/apps.nr

@@ -0,0 +1,2 @@
+mod deposit;
+mod constructor;

yarn-project/noir-private-kernel/src/crates/private-kernel-lib/src/tests/apps/constructor.nr

@@ -0,0 +1,12 @@
+use crate::{
+    abis::private_circuit_public_inputs::PrivateCircuitPublicInputs,
+    tests::testing_harness::{PrivateCircuitPublicInputsBuilder, PrivateAppInputs},
+    utils::uint128::U128,
+    hash::NUM_FIELDS_PER_SHA256,
+};
+
+struct ConstructorParams {}
+
+pub fn constructor_app(inputs: PrivateAppInputs, params: ConstructorParams) -> PrivateCircuitPublicInputs {
+    PrivateCircuitPublicInputsBuilder::new(inputs).finish()
+}

yarn-project/noir-private-kernel/src/crates/private-kernel-lib/src/tests/apps/deposit.nr

@@ -0,0 +1,39 @@
+use crate::{
+    abis::private_circuit_public_inputs::PrivateCircuitPublicInputs,
+    tests::testing_harness::{PrivateCircuitPublicInputsBuilder, PrivateAppInputs},
+    utils::uint128::U128,
+    hash::NUM_FIELDS_PER_SHA256,
+};
+
+global BALANCES_SLOT = 1;
+
+struct DepositParams {
+    amount: Field,
+    asset_id: Field,
+    memo: Field,
+    encrypted_logs_hash : [U128; NUM_FIELDS_PER_SHA256],
+    unencrypted_logs_hash : [U128; NUM_FIELDS_PER_SHA256],
+    encrypted_log_preimages_length : Field,
+    unencrypted_log_preimages_length : Field,
+}
+
+pub fn deposit_app(inputs: PrivateAppInputs, params: DepositParams) -> PrivateCircuitPublicInputs {
+    let msg_sender = inputs.call_context.msg_sender;
+
+    let mut context = PrivateCircuitPublicInputsBuilder::new(inputs);
+
+
+    let user_balance_slot = dep::std::hash::pedersen_hash([BALANCES_SLOT, params.asset_id, msg_sender.to_field()]);
+
+    let commitment = dep::std::hash::pedersen_hash([user_balance_slot, params.amount, msg_sender.to_field(), params.memo]);
+
+    context.new_commitments.push(commitment);
+
+    context.encrypted_logs_hash = params.encrypted_logs_hash.map(|uint: U128| uint.to_field());
+    context.unencrypted_logs_hash = params.unencrypted_logs_hash.map(|uint: U128| uint.to_field());
+
+    context.encrypted_log_preimages_length = params.encrypted_log_preimages_length;
+    context.unencrypted_log_preimages_length = params.unencrypted_log_preimages_length;
+
+    context.finish()
+}