Fix .gitignore: stop tracking ignored files

backend/lib/openzeppelin-contracts/test/access/Ownable.test.js

@@ -0,0 +1,59 @@
+const { constants, expectEvent, expectRevert } = require('@openzeppelin/test-helpers');
+const { ZERO_ADDRESS } = constants;
+
+const { expect } = require('chai');
+
+const Ownable = artifacts.require('$Ownable');
+
+contract('Ownable', function (accounts) {
+  const [owner, other] = accounts;
+
+  beforeEach(async function () {
+    this.ownable = await Ownable.new({ from: owner });
+  });
+
+  it('has an owner', async function () {
+    expect(await this.ownable.owner()).to.equal(owner);
+  });
+
+  describe('transfer ownership', function () {
+    it('changes owner after transfer', async function () {
+      const receipt = await this.ownable.transferOwnership(other, { from: owner });
+      expectEvent(receipt, 'OwnershipTransferred');
+
+      expect(await this.ownable.owner()).to.equal(other);
+    });
+
+    it('prevents non-owners from transferring', async function () {
+      await expectRevert(this.ownable.transferOwnership(other, { from: other }), 'Ownable: caller is not the owner');
+    });
+
+    it('guards ownership against stuck state', async function () {
+      await expectRevert(
+        this.ownable.transferOwnership(ZERO_ADDRESS, { from: owner }),
+        'Ownable: new owner is the zero address',
+      );
+    });
+  });
+
+  describe('renounce ownership', function () {
+    it('loses ownership after renouncement', async function () {
+      const receipt = await this.ownable.renounceOwnership({ from: owner });
+      expectEvent(receipt, 'OwnershipTransferred');
+
+      expect(await this.ownable.owner()).to.equal(ZERO_ADDRESS);
+    });
+
+    it('prevents non-owners from renouncement', async function () {
+      await expectRevert(this.ownable.renounceOwnership({ from: other }), 'Ownable: caller is not the owner');
+    });
+
+    it('allows to recover access using the internal _transferOwnership', async function () {
+      await this.ownable.renounceOwnership({ from: owner });
+      const receipt = await this.ownable.$_transferOwnership(other);
+      expectEvent(receipt, 'OwnershipTransferred');
+
+      expect(await this.ownable.owner()).to.equal(other);
+    });
+  });
+});