Expand node version file support to include lts based codenames

__tests__/node-version-file.test.ts

@@ -0,0 +1,88 @@
+import * as nv from '../src/node-version';
+import * as nvf from '../src/node-version-file';
+
+let nodeTestDist = require('./data/node-dist-index.json');
+
+describe('node-version-file', () => {
+  let getVersionsFromDist: jest.SpyInstance;
+
+  beforeEach(() => {
+    // @actions/core
+    console.log('::stop-commands::stoptoken'); // Disable executing of runner commands when running tests in actions
+
+    getVersionsFromDist = jest.spyOn(nv, 'getVersionsFromDist');
+
+    // gets
+    getVersionsFromDist.mockImplementation(() => <nv.INodeVersion>nodeTestDist);
+  });
+
+  afterEach(() => {
+    jest.resetAllMocks();
+    jest.clearAllMocks();
+    //jest.restoreAllMocks();
+  });
+
+  afterAll(async () => {
+    console.log('::stoptoken::'); // Re-enable executing of runner commands when running tests in actions
+  }, 100000);
+
+  //--------------------------------------------------
+  // Manifest find tests
+  //--------------------------------------------------
+  describe('parseNodeVersionFile', () => {
+    it('without `v` prefix', async () => {
+      // Arrange
+      const versionSpec = '12';
+
+      // Act
+      const result = await nvf.parseNodeVersionFile(versionSpec);
+
+      // Assert
+      expect(result).toBe(versionSpec);
+    });
+
+    it('lts/*', async () => {
+      // Arrange
+      const versionSpec = 'lts/*';
+
+      // Act
+      const result = await nvf.parseNodeVersionFile(versionSpec);
+
+      // Assert
+      expect(result).toMatch(/^\d+\.\d+\.\d+$/);
+    });
+
+    it('lts/erbium', async () => {
+      // Arrange
+      const versionSpec = 'lts/*';
+
+      // Act
+      const result = await nvf.parseNodeVersionFile(versionSpec);
+
+      // Assert
+      expect(result).toMatch(/\d\.\d\.\d/);
+    });
+
+    it('partial syntax like 12', async () => {
+      // Arrange
+      const versionSpec = '12';
+
+      // Act
+      const result = await nvf.parseNodeVersionFile(versionSpec);
+
+      // Assert
+      expect(result).toBe(versionSpec);
+    });
+
+    it('partial syntax like 12.16', async () => {
+      // Arrange
+      const versionSpec = '12.16';
+
+      // Act
+      const result = await nvf.parseNodeVersionFile(versionSpec);
+
+      // Assert
+      expect(result).toBe(versionSpec);
+    });
+  });
+});