Create test-data-feed.js

projects/oracle-nexus/tests/unit-tests/test-data-feed.js

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+const { expect } = require('chai');
+const { ethers } = require('hardhat');
+
+describe('DataFeed', () => {
+  let dataFeed;
+  let dataSource1;
+  let dataSource2;
+
+  beforeEach(async () => {
+    [dataSource1, dataSource2] = await ethers.getSigners();
+    const DataFeed = await ethers.getContractFactory('DataFeed');
+    dataFeed = await DataFeed.deploy();
+    await dataFeed.deployed();
+  });
+
+  it('should deploy DataFeed contract', async () => {
+    expect(dataFeed.address).to.not.be.undefined;
+  });
+
+  it('should allow data sources to push data', async () => {
+    await dataFeed.connect(dataSource1).pushData('0x123456');
+    expect(await dataFeed.getLatestData()).to.equal('0x123456');
+    await dataFeed.connect(dataSource2).pushData('0x789012');
+    expect(await dataFeed.getLatestData()).to.equal('0x789012');
+  });
+
+  it('should allow data sources to be added and removed', async () => {
+    await dataFeed.connect(dataSource1).addDataSource();
+    expect(await dataFeed.getDataSources()).to.include(dataSource1.address);
+    await dataFeed.connect(dataSource1).removeDataSource();
+    expect(await dataFeed.getDataSources()).to.not.include(dataSource1.address);
+  });
+
+  it('should allow historical data to be retrieved', async () => {
+    await dataFeed.connect(dataSource1).pushData('0x123456');
+    await dataFeed.connect(dataSource2).pushData('0x789012');
+    expect(await dataFeed.getHistoricalData(1)).to.equal('0x123456');
+  });
+});