test: add test for gitStashPop throwing

test/gitWorkflow.spec.js

@@ -3,7 +3,7 @@
 import path from 'path'
 import tmp from 'tmp'
 import execa from 'execa'
-import { execGit } from '../src/gitWorkflow'
+import { execGit, gitStashPop } from '../src/gitWorkflow'
 
 tmp.setGracefulCleanup()
 
@@ -32,4 +32,12 @@ describe('gitWorkflow', () => {
       })
     })
   })
+
+  describe('gitStashPop', () => {
+    it('should throw when workingTree is null', () => {
+      expect(gitStashPop()).rejects.toThrowErrorMatchingInlineSnapshot(
+        `"Trying to restore from stash but could not find working copy stash."`
+      )
+    })
+  })
 })