Latest tag with any prefix + tests (#1188)

lib/version.spec.js

@@ -0,0 +1,38 @@
+'use strict';
+
+const assert = require('assert');
+const {latest} = require('./version');
+
+describe('latest', function () {
+  it('should handle semver compatible versions', function () {
+    assert.equal(latest(['1.0.0', '1.0.2', '1.0.1']), '1.0.2');
+    assert.equal(latest(['1.0.0', '2.0.0', '3.0.0']), '3.0.0');
+    assert.equal(latest(['0.0.1', '0.0.10', '0.0.2', '0.0.20']), '0.0.20');
+  });
+
+  it('should handle versions with and without prefix', function () {
+    assert.equal(latest(['1.0.0', 'v1.0.2', 'r1.0.1', 'release-2.0.0']), 'release-2.0.0');
+    assert.equal(latest(['1.0.0', 'v2.0.0', 'r1.0.1', 'release-1.0.3']), 'v2.0.0');
+    assert.equal(latest(['2.0.0', 'v1.0.3', 'r1.0.1', 'release-1.0.3']), '2.0.0');
+    assert.equal(latest(['1.0.0', 'v1.0.2', 'r2.0.0', 'release-1.0.3']), 'r2.0.0');
+  });
+
+  it('should handle simple dotted versions', function () {
+    assert.equal(latest(['0.1', '0.3', '0.2']), '0.3');
+    assert.equal(latest(['0.1', '0.5', '0.12', '0.21']), '0.21');
+    assert.equal(latest(['1.0', '2.0', '3.0']), '3.0');
+  });
+
+  it('should handle versions with "v" prefix', function () {
+    assert.equal(latest(['v1.0.0', 'v1.0.2', 'v1.0.1']), 'v1.0.2');
+    assert.equal(latest(['v1.0.0', 'v3.0.0', 'v2.0.0']), 'v3.0.0');
+  });
+
+  it('should handle versions with "-release" prefix', function () {
+    assert.equal(latest(['release-1.0.0', 'release-1.0.2', 'release-1.0.20', 'release-1.0.3']), 'release-1.0.20');
+  });
+
+  it('should handle simple (one number) versions', function () {
+    assert.equal(latest(['2', '10', '1']), '10');
+  });
+});