test:add tests to ensure objects are not modified

tests/got/test_reply_body.js

@@ -116,20 +116,20 @@ describe('`reply()` body', () => {
     scope.done()
   })
 
-  it('does not modify the original used for response', async () => {
-    const patchBody = { id: 1234 }
+  it('does not modify the object used for response', async () => {
+    const patchBody = { number: 1234 }
+    const form = new FormData()
+    form.append('number', 1234)
+
     const scope = nock('http://example.test')
       .patch('/', patchBody)
       .reply(200, patchBody)
 
-    const { statusCode, headers, body } = await got.patch(
-      'http://example.test/',
-      { body: JSON.stringify(patchBody) },
-    )
+    await got.patch('http://example.test/', {
+      form,
+    })
 
-    expect(statusCode).to.equal(200)
-    expect(headers).to.include({ 'content-type': 'application/json' })
-    expect(body).to.be.a('string').and.equal(JSON.stringify(patchBody))
+    expect(patchBody.number).to.be.a('number').and.equal(1234)
     scope.done()
   })
 })

tests/test_common.js

@@ -71,6 +71,18 @@ describe('Body Match', () => {
       const result = matchBody({}, { number: 1 }, '{"number": "1"}')
       expect(result).to.equal(false)
     })
+
+    it('should not modify the original spec object', () => {
+      const spec = { number: 1 }
+      matchBody(
+        {
+          headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+        },
+        spec,
+        '',
+      )
+      expect(spec).to.deep.equal({ number: 1 })
+    })
   })
 })