--- a/tests/src/approve.test.ts
+++ b/tests/src/approve.test.ts
@@ -24,7 +24,6 @@
 } from './util/helpers';
 
 chai.use(chaiAsPromised);
-const expect = chai.expect;
 
 describe('Integration Test approve(spender, collection_id, item_id, amount):', () => {
   let alice: IKeyringPair;
--- a/tests/src/inflation.test.ts
+++ b/tests/src/inflation.test.ts
@@ -25,7 +25,7 @@
       const totalActualInflation = blockInflation * YEAR / blockInterval;
 
       const tolerance = 0.00001; // Relative difference per year between theoretical and actual inflation
-      let expectedInflation = totalExpectedInflation / totalActualInflation - 1n;
+      const expectedInflation = totalExpectedInflation / totalActualInflation - 1n;
 
       expect(Math.abs(Number(expectedInflation))).to.be.lessThanOrEqual(tolerance);
     });