diff --git a/__tests__/utils.test.ts b/__tests__/utils.test.ts
new file mode 100644
index 0000000..851a2cb
--- /dev/null
+++ b/__tests__/utils.test.ts
@@ -0,0 +1,25 @@
+import {describe, test, expect} from '@jest/globals'
+import {extractVersion} from '../src/utils'
+
+// shows how the runner will run a javascript action with env / stdout protocol
+describe('extractVersion', () => {
+  test('should return the version if the branch convention is valid', () => {
+    expect(extractVersion('hotfix/1.2.3')).toBe('1.2.3')
+    expect(extractVersion('hotfix/v1.2.3')).toBe('1.2.3')
+    expect(extractVersion('hotfix/ktx/v1.2.3')).toBe('1.2.3')
+
+    expect(extractVersion('release/1.2.3')).toBe('1.2.3')
+    expect(extractVersion('release/v1.2.3')).toBe('1.2.3')
+    expect(extractVersion('release/ktx/v1.2.3')).toBe('1.2.3')
+  })
+
+  test('Should return an empty string if the branch convention is invalid', () => {
+    expect(extractVersion('v1.2.3')).toBe('')
+    expect(extractVersion('1.2.3')).toBe('')
+    expect(extractVersion('unknown/1.2.3')).toBe('')
+    expect(extractVersion('hotfixx/1.2.3')).toBe('')
+    expect(extractVersion('hotfixx/v1.2.3')).toBe('')
+    expect(extractVersion('releases/1.2.3')).toBe('')
+    expect(extractVersion('releases/v1.2.3')).toBe('')
+  })
+})