Add unit tests to this project to help ensure stability

package.json

@@ -7,8 +7,8 @@
     "build": "rimraf dist && tsc",
     "lint": "eslint \"src/**\"",
     "watch": "tsc --watch",
-    "test": "nyc mocha \"src/**/*spec.ts\"",
-    "test:nocover": "mocha \"src/**/*.spec.ts\"",
+    "test": "NODE_OPTIONS='--import tsx' nyc mocha \"src/**/*spec.ts\"",
+    "test:nocover": "NODE_OPTIONS='--import tsx' mocha \"src/**/*.spec.ts\"",
     "package": "npm run build && npm pack"
   },
   "repository": {
@@ -34,6 +34,7 @@
   },
   "devDependencies": {
     "@types/chai": "^4.2.22",
+    "@types/chai-as-promised": "^8.0.2",
     "@types/dateformat": "~3",
     "@types/debounce": "^1.2.1",
     "@types/decompress": "^4.2.4",
@@ -50,6 +51,7 @@
     "@typescript-eslint/eslint-plugin": "^5.27.0",
     "@typescript-eslint/parser": "^5.27.0",
     "chai": "^4.3.4",
+    "chai-as-promised": "^8.0.2",
     "eslint": "^8.1.0",
     "eslint-plugin-no-only-tests": "^2.6.0",
     "mocha": "^11.1.0",
@@ -61,10 +63,6 @@
     "typescript": "^4.7.2"
   },
   "mocha": {
-    "require": [
-      "source-map-support/register",
-      "ts-node/register"
-    ],
     "watchFiles": [
       "src/**/*"
     ],
@@ -81,10 +79,6 @@
     "extension": [
       ".ts"
     ],
-    "require": [
-      "ts-node/register",
-      "source-map-support/register"
-    ],
     "reporter": [
       "text-summary",
       "html"

src/ProjectManager.spec.ts

@@ -0,0 +1,136 @@
+/* eslint-disable camelcase */
+import { expect } from 'chai';
+import * as chai from 'chai';
+import chaiAsPromised from 'chai-as-promised';
+import { createSandbox } from 'sinon';
+import { ProjectManager, Project, ProjectDependency } from './ProjectManager';
+import { utils } from './utils';
+
+chai.use(chaiAsPromised);
+
+const sinon = createSandbox();
+
+describe('ProjectManager', () => {
+    beforeEach(() => {
+        sinon.restore();
+        // Reset the singleton instance
+        (ProjectManager as any).instance = undefined;
+    });
+
+    afterEach(() => {
+        sinon.restore();
+    });
+
+    describe('getPreviousVersion', () => {
+        it('returns the previous release version', () => {
+            let tags = [
+                'v1.0.0',
+                'v0.9.0',
+                'v0.8.0'
+            ];
+            sinon.stub(utils, 'executeCommandWithOutput').callsFake((cmd: string) => {
+                if (cmd === `git tag --merged HEAD`) {
+                    return tags.join('\n');
+                }
+                return '';
+            });
+
+            expect(ProjectManager.getPreviousVersion('1.0.1', '')).to.equal('1.0.0');
+            expect(ProjectManager.getPreviousVersion('0.9.1', '')).to.equal('0.9.0');
+            expect(ProjectManager.getPreviousVersion('0.8.9', '')).to.equal('0.8.0');
+            expect(ProjectManager.getPreviousVersion('0.1.0', '')).to.equal(undefined);
+        });
+
+        it('handles prerelease versions', () => {
+            sinon.stub(utils, 'executeCommandWithOutput').callsFake((cmd: string) => {
+                if (cmd === `git tag --merged HEAD`) {
+                    return tags.join('\n');
+                }
+                return '';
+            });
+
+            let tags = [
+                'v0.9.9',
+                'v0.9.0',
+                'v0.8.0'
+            ];
+            expect(ProjectManager.getPreviousVersion('1.0.0-alpha.0', '')).to.equal('0.9.9');
+
+            tags = [
+                'v1.0.0-alpha.0',
+                'v1.0.0',
+                'v0.9.0',
+                'v0.8.0'
+            ];
+            expect(ProjectManager.getPreviousVersion('1.0.0-alpha.1', '')).to.equal('1.0.0-alpha.0');
+
+            tags = [
+                'v0.9.2',
+                'v0.9.1',
+                'v0.9.0',
+                'v1.0.0-alpha.0',
+                'v0.9.0',
+                'v0.8.0'
+            ];
+            expect(ProjectManager.getPreviousVersion('1.0.0-alpha.1', '')).to.equal('1.0.0-alpha.0');
+        });
+
+        it('returns undefined when no previous version exists', () => {
+            sinon.stub(utils, 'executeCommandWithOutput').returns('');
+
+            expect(ProjectManager.getPreviousVersion('1.0.0', '')).to.equal(undefined);
+        });
+    });
+
+    describe('getProject', () => {
+        it('returns undefined for unknown project', () => {
+            const result = ProjectManager.getProject('unknown-project');
+
+            expect(result).to.be.undefined;
+        });
+    });
+
+    describe('Project class', () => {
+        it('initializes with correct default values', () => {
+            const project = new Project('test', '@test/project', 'https://github.com/test/repo');
+
+            expect(project.name).to.equal('test');
+            expect(project.npmName).to.equal('@test/project');
+            expect(project.repositoryUrl).to.equal('https://github.com/test/repo');
+            expect(project.version).to.equal('');
+            expect(project.dependencies).to.deep.equal([]);
+            expect(project.devDependencies).to.deep.equal([]);
+            expect(project.changes).to.deep.equal([]);
+        });
+    });
+
+    describe('ProjectDependency class', () => {
+        it('initializes with correct values', () => {
+            const dep = new ProjectDependency('pkg', 'repo', '1.0.0', '1.1.0', 'https://github.com/test/repo');
+
+            expect(dep.name).to.equal('pkg');
+            expect(dep.repoName).to.equal('repo');
+            expect(dep.previousReleaseVersion).to.equal('1.0.0');
+            expect(dep.newVersion).to.equal('1.1.0');
+            expect(dep.repositoryUrl).to.equal('https://github.com/test/repo');
+        });
+
+        it('hasChanged returns truthy when versions differ', () => {
+            const dep = new ProjectDependency('pkg', 'repo', '1.0.0', '1.1.0', 'https://github.com/test/repo');
+
+            expect(dep.hasChanged()).to.be.ok;
+        });
+
+        it('hasChanged returns falsy when versions are the same', () => {
+            const dep = new ProjectDependency('pkg', 'repo', '1.0.0', '1.0.0', 'https://github.com/test/repo');
+
+            expect(dep.hasChanged()).to.not.be.ok;
+        });
+
+        it('hasChanged returns falsy for invalid semver', () => {
+            const dep = new ProjectDependency('pkg', 'repo', 'invalid', '1.0.0', 'https://github.com/test/repo');
+
+            expect(dep.hasChanged()).to.not.be.ok;
+        });
+    });
+});