fix(ext/fetch): `Body#bodyUsed` for static body (#16080)

This fixes a bug where `Body#bodyUsed` incorrectly returns `false`
for a body that has actually already been consumed, after `Body#body`
is called.

1 files changed, 10 insertions, 0 deletions

diff --git a/cli/tests/unit/response_test.ts b/cli/tests/unit/response_test.ts
index c46218b62..c2a230138 100644
--- a/cli/tests/unit/response_test.ts
+++ b/cli/tests/unit/response_test.ts
@@ -90,3 +90,13 @@ Deno.test(function customInspectFunction() {
   );
   assertStringIncludes(Deno.inspect(Response.prototype), "Response");
 });
+
+Deno.test(async function responseBodyUsed() {
+  const response = new Response("body");
+  assert(!response.bodyUsed);
+  await response.text();
+  assert(response.bodyUsed);
+  // .body getter is needed so we can test the faulty code path
+  response.body;
+  assert(response.bodyUsed);
+});