From c7081e6be4c3743c072a5dfa12c1a0e3192059ca Mon Sep 17 00:00:00 2001
From: William Ferreira da Silva <williamfdasilva@gmail.com>
Date: Wed, 28 May 2025 21:43:41 -0300
Subject: [PATCH 1/2] fix(test): update decompress: false test to match actual
 parsing error

---
 test/routes-decompress.test.js | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/test/routes-decompress.test.js b/test/routes-decompress.test.js
index 2da799a..517559e 100644
--- a/test/routes-decompress.test.js
+++ b/test/routes-decompress.test.js
@@ -185,9 +185,8 @@ describe('When using routes `decompress` settings :', async () => {
     equal(response.statusCode, 400)
     t.assert.deepEqual(response.json(), {
       statusCode: 400,
-      code: 'FST_ERR_CTP_INVALID_CONTENT_LENGTH',
       error: 'Bad Request',
-      message: 'Request body size did not match Content-Length'
+      message: response.json().message
     })
   })
 

From e6cd513e6a4712466d98688cf6b07325075ca6df Mon Sep 17 00:00:00 2001
From: William Ferreira da Silva <williamfdasilva@gmail.com>
Date: Thu, 29 May 2025 08:53:36 -0300
Subject: [PATCH 2/2] test: fix route decompress error handling and add
 coverage for FST_ERR_CTP_INVALID_CONTENT_LENGTH

---
 test/routes-decompress.test.js | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/test/routes-decompress.test.js b/test/routes-decompress.test.js
index 517559e..971f8e3 100644
--- a/test/routes-decompress.test.js
+++ b/test/routes-decompress.test.js
@@ -182,11 +182,37 @@ describe('When using routes `decompress` settings :', async () => {
     })
     equal(usedCustomGlobal, false)
 
+    equal(response.statusCode, 400)
+    t.assert.match(response.json().message, /is not valid JSON/)
+  })
+
+  test('it should return FST_ERR_CTP_INVALID_CONTENT_LENGTH when Content-Length mismatches payload', async (t) => {
+    t.plan(2)
+    const equal = t.assert.equal
+
+    const fastify = Fastify()
+    await fastify.register(compressPlugin)
+
+    fastify.post('/length', (request, reply) => {
+      reply.send({ ok: true })
+    })
+
+    const response = await fastify.inject({
+      url: '/length',
+      method: 'POST',
+      headers: {
+        'content-type': 'application/json',
+        'content-length': '100',
+      },
+      payload: JSON.stringify({ hello: 'world' })
+    })
+
     equal(response.statusCode, 400)
     t.assert.deepEqual(response.json(), {
       statusCode: 400,
+      code: 'FST_ERR_CTP_INVALID_CONTENT_LENGTH',
       error: 'Bad Request',
-      message: response.json().message
+      message: 'Request body size did not match Content-Length'
     })
   })