add unit tests

test/unit/specs/services/version/version.service.spec.js

@@ -0,0 +1,11 @@
+import { extractCommit } from 'src/services/version/version.service.js'
+
+describe('extractCommit', () => {
+  it('return short commit hash following "-g" characters', () => {
+    expect(extractCommit('1.0.0-45-g5e7aeebc')).to.eql('5e7aeebc')
+  })
+
+  it('return short commit hash without branch name', () => {
+    expect(extractCommit('1.0.0-45-g5e7aeebc-branch')).to.eql('5e7aeebc')
+  })
+})