test: include unset body check

Added a check for unset body on the test "should ignore JSON empty body"

Author: fernando7jr

test.ts

@@ -31,6 +31,7 @@ test('should ignore JSON empty body', async () => {
     res.end(JSON.stringify({ok: true}));
   })
 
+  // Empty string body
   await makeFetch(server)('/', {
     body: '',
     method: 'POST',
@@ -39,6 +40,15 @@ test('should ignore JSON empty body', async () => {
       'Content-Type': 'application/json',
     },
   }).expect(200, { ok: true })
+
+  // Unset body
+  await makeFetch(server)('/', {
+    method: 'POST',
+    headers: {
+      Accept: 'application/json',
+      'Content-Type': 'application/json',
+    },
+  }).expect(200, { ok: true })
 })
 
 test('should parse json body with no content-type headers', async () => {