start on some tests

app/test/unit/git/worktree-test.ts

@@ -0,0 +1,29 @@
+import { setupEmptyRepository } from '../../helpers/repositories'
+import { listWorktrees } from '../../../src/lib/git/worktree'
+
+describe('git/worktree', () => {
+  describe('list', () => {
+    describe('for an unborn repository', () => {
+      it('returns one entry', async () => {
+        const repository = await setupEmptyRepository()
+        const result = await listWorktrees(repository)
+        expect(result).toHaveLength(1)
+      })
+
+      it('contains the head and path of the main repository', async () => {
+        const repository = await setupEmptyRepository()
+        const { path } = repository
+        const result = await listWorktrees(repository)
+        const first = result[0]
+        expect(first.head).toBe('0000000000000000000000000000000000000000')
+
+        // You might be wondering why this isn't a `.toBe` comparsion.
+        // Well, on macOS the path emitted by Git may start with a `/private`
+        // which is super-annoying and also different to what NodeJS returns,
+        // so we need to manage and reconcile these two cases
+        const endsWith = first.path.endsWith(path)
+        expect(endsWith).toBe(true)
+      })
+    })
+  })
+})