test: remove dead throwingTag setup and duplicate throw stub

for.spec kept throwingTag registration after #713 removed its test. Reuse ThrowingTag in liquid.spec instead of IntendedRenderErrorTag.

Co-authored-by: Cursor <[email protected]>

test/integration/liquid/liquid.spec.ts

@@ -1,7 +1,7 @@
 import { Liquid, Context, isFalsy } from '../../../src'
 import { mock, restore } from '../../stub/mockfs'
 import { drainStream } from '../../stub/stream'
-import { IntendedRenderErrorTag } from '../../stub/tags'
+import { ThrowingTag } from '../../stub/tags'
 import { resolve } from 'path'
 
 describe('Liquid', function () {
@@ -232,7 +232,7 @@ describe('Liquid', function () {
         '/root/error.html': 'A{%throwingTag%}B'
       })
       engine = new Liquid({ root: ['/root/'] })
-      engine.registerTag('throwingTag', IntendedRenderErrorTag)
+      engine.registerTag('throwingTag', ThrowingTag)
     })
     afterEach(restore)
     it('should render a simple value', async () => {
@@ -241,7 +241,7 @@ describe('Liquid', function () {
     })
     it('should throw RenderError when tag throws', async () => {
       const stream = await engine.renderFileToNodeStream('error.html')
-      expect(drainStream(stream)).rejects.toThrow(/intended render error/)
+      expect(drainStream(stream)).rejects.toThrow(/intended error/)
     })
   })
   describe('#analyze', () => {