[Sweep Rules] Create unit test for new business logic in regionController.js and Hierarchy.js

backend/test/Hierarchy.test.js

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+// backend/test/Hierarchy.test.js
+
+// Import necessary modules and functions
+const { getSiblings } = require('../models/Hierarchy');
+
+// Test cases for getSiblings function
+describe('getSiblings', () => {
+  // Test case for when there are siblings
+  test('should return an array of sibling hierarchies when there are siblings', () => {
+    // Create a mock hierarchy
+    const hierarchy = { id: 1, name: 'Hierarchy A' };
+
+    // Mock the Hierarchy.findOne method to return the mock hierarchy
+    Hierarchy.findOne = jest.fn().mockResolvedValue(hierarchy);
+
+    // Call the getSiblings function
+    const siblings = getSiblings(1);
+
+    // Assert that the result is an array of sibling hierarchies
+    expect(Array.isArray(siblings)).toBe(true);
+    expect(siblings).toHaveLength(2);
+    expect(siblings).toContainEqual({ id: 2, name: 'Hierarchy B' });
+    expect(siblings).toContainEqual({ id: 3, name: 'Hierarchy C' });
+  });
+
+  // Test case for when there are no siblings
+  test('should return an empty array when there are no siblings', () => {
+    // Mock the Hierarchy.findOne method to return null
+    Hierarchy.findOne = jest.fn().mockResolvedValue(null);
+
+    // Call the getSiblings function
+    const siblings = getSiblings(4);
+
+    // Assert that the result is an empty array
+    expect(Array.isArray(siblings)).toBe(true);
+    expect(siblings).toHaveLength(0);
+  });
+});

backend/test/package.json

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+{
+  "name": "backend-test",
+  "version": "1.0.0",
+  "description": "Unit tests for the backend",
+  "scripts": {
+    "test": "jest regionController.test.js Hierarchy.test.js"
+  },
+  "devDependencies": {
+    "jest": "^27.0.6"
+  }
+}

backend/test/regionController.test.js

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+// backend/test/regionController.test.js
+
+// Import necessary modules and functions
+const { getSiblings } = require('../controllers/regionController');
+const { Region } = require('../models/Region');
+
+// Test cases for getSiblings function
+describe('getSiblings', () => {
+  // Test case for when the region exists
+  test('should return an array of sibling regions when the region exists', () => {
+    // Create a mock region
+    const region = new Region({ name: 'Region A' });
+
+    // Mock the Region.findOne method to return the mock region
+    Region.findOne = jest.fn().mockResolvedValue(region);
+
+    // Call the getSiblings function
+    const siblings = getSiblings('Region A');
+
+    // Assert that the result is an array of sibling regions
+    expect(Array.isArray(siblings)).toBe(true);
+    expect(siblings).toHaveLength(2);
+    expect(siblings).toContainEqual({ name: 'Region B' });
+    expect(siblings).toContainEqual({ name: 'Region C' });
+  });
+
+  // Test case for when the region does not exist
+  test('should return an empty array when the region does not exist', () => {
+    // Mock the Region.findOne method to return null
+    Region.findOne = jest.fn().mockResolvedValue(null);
+
+    // Call the getSiblings function
+    const siblings = getSiblings('Region D');
+
+    // Assert that the result is an empty array
+    expect(Array.isArray(siblings)).toBe(true);
+    expect(siblings).toHaveLength(0);
+  });
+});