git.delta.rocks / unique-network / refs/commits / a4faf27db0a8

--- /dev/null
+++ b/tests/src/inflation.test.ts
@@ -0,0 +1,58 @@
+// Copyright 2019-2022 Unique Network (Gibraltar) Ltd.
+// This file is part of Unique Network.
+
+// Unique Network is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Unique Network is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
+
+import {IKeyringPair} from '@polkadot/types/types';
+import {expect, itSub, usingPlaygrounds} from './util/playgrounds';
+
+// todo:playgrounds requires sudo, look into on the later stage
+describe('integration test: Inflation', () => {
+  let superuser: IKeyringPair;
+
+  before(async () => {
+    await usingPlaygrounds(async (_, privateKey) => {
+      superuser = privateKey('//Alice');
+    });
+  });
+  
+  itSub('First year inflation is 10%', async ({helper}) => {
+    // Make sure non-sudo can't start inflation
+    const [bob] = await helper.arrange.createAccounts([10n], superuser);
+
+    await expect(helper.executeExtrinsic(bob, 'api.tx.inflation.startInflation', [1])).to.be.rejectedWith(/BadOrigin/);
+
+    // Make sure superuser can't start inflation without explicit sudo
+    await expect(helper.executeExtrinsic(superuser, 'api.tx.inflation.startInflation', [1])).to.be.rejectedWith(/BadOrigin/);
+
+    // Start inflation on relay block 1 (Alice is sudo)
+    const tx = helper.constructApiCall('api.tx.inflation.startInflation', [1]);
+    await expect(helper.executeExtrinsic(superuser, 'api.tx.sudo.sudo', [tx])).to.not.be.rejected;
+
+    const blockInterval = (helper.api!.consts.inflation.inflationBlockInterval as any).toBigInt();
+    const totalIssuanceStart = ((await helper.api!.query.inflation.startingYearTotalIssuance()) as any).toBigInt();
+    const blockInflation = (await helper.api!.query.inflation.blockInflation() as any).toBigInt();
+
+    const YEAR = 5259600n;  // 6-second block. Blocks in one year
+    // const YEAR = 2629800n; // 12-second block. Blocks in one year
+
+    const totalExpectedInflation = totalIssuanceStart / 10n;
+    const totalActualInflation = blockInflation * YEAR / blockInterval;
+
+    const tolerance = 0.00001; // Relative difference per year between theoretical and actual inflation
+    const expectedInflation = totalExpectedInflation / totalActualInflation - 1n;
+
+    expect(Math.abs(Number(expectedInflation))).to.be.lessThanOrEqual(tolerance);
+  });
+});