add setter.js test file

test/unit/Distributor/setters.js

@@ -0,0 +1,61 @@
+const { web3, accounts } = require('hardhat');
+const { expectRevert } = require('@openzeppelin/test-helpers');
+const { assert } = require('chai');
+const { hex } = require('../utils').helpers;
+const { toBN } = web3.utils;
+
+const [, treasury, coverHolder, newTreasury, nonOwner] = accounts;
+
+describe('buyCover', function () {
+
+  it('allows setting new treasury address by owner', async function () {
+    const { distributor } = this.contracts;
+
+    await distributor.setTreasury(newTreasury);
+
+    const currentTreasury = await distributor.treasury();
+    assert.equal(newTreasury, currentTreasury);
+  });
+
+  it('rejects setting new treasury to 0', async function () {
+    const { distributor } = this.contracts;
+
+    await expectRevert(
+      distributor.setTreasury('0x0000000000000000000000000000000000000000'),
+      'Distributor: treasury address is 0',
+    );
+  });
+
+  it('disallows setting the fee percentage by non-owner', async function () {
+    const { distributor } = this.contracts;
+
+    await expectRevert(
+      distributor.setTreasury(newTreasury, { from: nonOwner }),
+      'Ownable: caller is not the owner',
+    );
+  });
+
+  it('allows setting the fee percentage by owner', async function () {
+    const { distributor } = this.contracts;
+
+    const newFeePercentage = '20000';
+
+    await distributor.setFeePercentage(newFeePercentage);
+
+    const storedFeePercentage = await distributor.feePercentage();
+    assert(storedFeePercentage.toString(), newFeePercentage);
+  });
+
+  it('disallows setting the fee percentage by non-owner', async function () {
+    const { distributor } = this.contracts;
+
+    const newFeePercentage = '20000';
+
+    await expectRevert(
+      distributor.setFeePercentage(newFeePercentage, {
+        from: nonOwner,
+      }),
+      'Ownable: caller is not the owner',
+    );
+  });
+});