From d051c73da74c224784390cc061e18d77b9d7abec Mon Sep 17 00:00:00 2001
From: Ilya Evdokimov <evdokimov.ilya@gmail.com>
Date: Tue, 17 Jan 2023 14:04:40 +0100
Subject: [PATCH 1/2] sample contract improvement

---
 README.md                                       |  4 ++--
 sample-project-typescript/contracts/Sample.tsol |  4 ++++
 sample-project-typescript/test/sample-test.ts   | 10 +++++++++-
 3 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 08e4eee..609feb0 100644
--- a/README.md
+++ b/README.md
@@ -909,6 +909,6 @@ This module provides some utility functions for more convenient work with Ever o
 ````typescript
 import { toNano, fromNano, getRandomNonce, convertAmount } from "locklift";
 
-toNano(10); // 10000000000
-fromNano(10000000000); // 10```
+toNano(10); // 10000000000 nano evers
+fromNano(10000000000); // 10 evers```
 ````
diff --git a/sample-project-typescript/contracts/Sample.tsol b/sample-project-typescript/contracts/Sample.tsol
index 3788dea..e0e548d 100644
--- a/sample-project-typescript/contracts/Sample.tsol
+++ b/sample-project-typescript/contracts/Sample.tsol
@@ -23,6 +23,10 @@ contract Sample {
         emit StateChange(_state);
     }
 
+    function fail() public {
+        require( 1 < 0, 101); // 100 is default error code, it is good to set non-default codes beforehand
+    }
+
     function getDetails()
         external
         view
diff --git a/sample-project-typescript/test/sample-test.ts b/sample-project-typescript/test/sample-test.ts
index 3384ee4..d24ffef 100644
--- a/sample-project-typescript/test/sample-test.ts
+++ b/sample-project-typescript/test/sample-test.ts
@@ -29,7 +29,7 @@ describe("Test Sample contract", async function () {
         constructorParams: {
           _state: INIT_STATE,
         },
-        value: locklift.utils.toNano(2),
+        value: locklift.utils.toNano(2), // converts 2 evers to nanos
       });
       sample = contract;
 
@@ -45,5 +45,13 @@ describe("Test Sample contract", async function () {
 
       expect(Number(response._state)).to.be.equal(NEW_STATE, "Wrong state");
     });
+
+    it("Test error tracing", async function () {
+      const { traceTree } = await locklift.tracing.trace(
+        await sample.methods.fail({}).sendExternal({ publicKey: signer.publicKey }),
+        {rise: false}
+      );
+      expect(traceTree).to.have.error(101);
+    });
   });
 });

From 9a26652ae7499543dafea4ba3e002b4c8dddbbf8 Mon Sep 17 00:00:00 2001
From: Ilya Evdokimov <evdokimov.ilya@gmail.com>
Date: Tue, 17 Jan 2023 14:11:10 +0100
Subject: [PATCH 2/2] forgotten imports

---
 sample-project-typescript/test/sample-test.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sample-project-typescript/test/sample-test.ts b/sample-project-typescript/test/sample-test.ts
index d24ffef..f1c2a6a 100644
--- a/sample-project-typescript/test/sample-test.ts
+++ b/sample-project-typescript/test/sample-test.ts
@@ -1,6 +1,9 @@
 import { expect } from "chai";
 import { Contract, Signer } from "locklift";
 import { FactorySource } from "../build/factorySource";
+import { lockliftChai } from "locklift";
+import chai from "chai";
+chai.use(lockliftChai);
 
 let sample: Contract<FactorySource["Sample"]>;
 let signer: Signer;