Add very initial version of smart contracts with tests

test/contracts/miksi.test.ts

@@ -0,0 +1,81 @@
+const Verifier = artifacts.require("../../contracts/Verifier");
+const Miksi = artifacts.require("../../contracts/Miksi.sol");
+
+const chai = require("chai");
+const expect = chai.expect;
+
+const fs = require("fs");
+const { groth } = require('snarkjs');
+const { stringifyBigInts, unstringifyBigInts } = require('ffjavascript').utils;
+const WitnessCalculatorBuilder = require("circom_runtime").WitnessCalculatorBuilder;
+const circomlib = require("circomlib");
+
+contract("miksi", (accounts) => {
+
+
+  const {
+    0: owner,
+    1: idEth1,
+    2: idEth2,
+    3: idEth3,
+  } = accounts;
+
+  let insVerifier;
+  let insMiksi;
+
+  before(async () => {
+
+    insVerifier = await Verifier.new();
+    insMiksi = await Miksi.new(insVerifier.address);
+  });
+
+  it("miksi flow", async () => {
+    const secret = "123456789";
+
+    const coinCode = "1";
+    const amount = "100";
+
+    const poseidon = circomlib.poseidon.createHash(6, 8, 57);
+    const commitment = poseidon([coinCode, amount, secret]).toString();
+
+    // deposit
+    await insMiksi.deposit(coinCode, amount, commitment);
+
+    // getDeposit data
+    const res = await insMiksi.getDeposit(commitment);
+    expect(res[0].toString()).to.be.equal(coinCode);
+    expect(res[1].toString()).to.be.equal(amount);
+
+
+    // calculate witness
+    const wasm = await fs.promises.readFile("./build/withdraw.wasm");
+    const input = unstringifyBigInts({
+      "coinCode": coinCode,
+      "amount": amount,
+      "commitment": commitment,
+      "secret": secret
+    });
+    const options = {};
+    const wc = await WitnessCalculatorBuilder(wasm, options);
+    const w = await wc.calculateWitness(input);
+    const witness = unstringifyBigInts(stringifyBigInts(w));
+
+    // generate zkproof of commitment using snarkjs (as is a test)
+    const provingKey = unstringifyBigInts(JSON.parse(fs.readFileSync("./build/proving_key.json", "utf8")));
+
+    const {proof, publicSignals} = groth.genProof(provingKey, witness);
+
+    // withdraw
+    const resW = await insMiksi.withdraw(
+      commitment, 
+      [proof.pi_a[0].toString(), proof.pi_a[1].toString()],
+      [
+        [proof.pi_b[0][1].toString(), proof.pi_b[0][0].toString()],
+        [proof.pi_b[1][1].toString(), proof.pi_b[1][0].toString()]
+      ],
+      [proof.pi_c[0].toString(), proof.pi_c[1].toString()]
+    );
+    console.log("resW", resW);
+
+  });
+});