Fix vesting calculated amount immediately after the end of the cliff period (#92)

Author: Hrom131

contracts/finance/vesting/Vesting.sol

@@ -385,7 +385,7 @@ abstract contract Vesting is Initializable {
             _baseData.secondsInPeriod
         );
 
-        if (elapsedPeriods_ <= _baseData.cliffInPeriods) {
+        if (elapsedPeriods_ < _baseData.cliffInPeriods) {
             return 0;
         }
 

contracts/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@solarity/solidity-lib",
-  "version": "2.7.0",
+  "version": "2.7.1",
   "license": "MIT",
   "author": "Distributed Lab",
   "readme": "README.md",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@solarity/solidity-lib",
-  "version": "2.7.0",
+  "version": "2.7.1",
   "license": "MIT",
   "author": "Distributed Lab",
   "description": "Solidity Library by Distributed Lab",

test/finance/vesting/Vesting.test.ts

@@ -407,22 +407,42 @@ describe("Vesting", () => {
       let vestingStartTime = BigInt(await time.latest());
       let timestampUpTo = vestingStartTime;
 
+      await vesting.createSchedule(defaultSchedule);
+
       expect(await vesting.vestingCalculation(scheduleId, vestingAmount, vestingStartTime, timestampUpTo)).to.be.equal(
         0,
       );
     });
 
     it("should return 0 if cliff is active", async () => {
       let vestingStartTime = BigInt(await time.latest());
-      let timestampUpTo = vestingStartTime + secondsInPeriod;
+      let timestampUpTo = vestingStartTime + secondsInPeriod * 2n;
 
-      defaultSchedule.scheduleData.cliffInPeriods = 2n;
+      defaultSchedule.scheduleData.cliffInPeriods = 3n;
 
       await vesting.createSchedule(defaultSchedule);
 
       expect(await vesting.vestingCalculation(scheduleId, vestingAmount, vestingStartTime, timestampUpTo)).to.be.equal(
         0,
       );
     });
+
+    it("should return correct tokens amount right after cliff period is over", async () => {
+      let vestingStartTime = BigInt(await time.latest());
+      let timestampUpTo = vestingStartTime + secondsInPeriod * 3n + 1n;
+
+      const newCliffInPeriods = 3n;
+      const someVestingAmount = wei(120_000);
+      const expectedAmount = (someVestingAmount / durationInPeriods) * newCliffInPeriods;
+
+      defaultSchedule.scheduleData.cliffInPeriods = newCliffInPeriods;
+      defaultSchedule.exponent = 1;
+
+      await vesting.createSchedule(defaultSchedule);
+
+      expect(
+        await vesting.vestingCalculation(scheduleId, someVestingAmount, vestingStartTime, timestampUpTo),
+      ).to.be.equal(expectedAmount);
+    });
   });
 });