7 function testFd(input, errObj) {  argument
8   assert.throws(() => fs.fchown(input), errObj);
9   assert.throws(() => fs.fchownSync(input), errObj);
12 function testUid(input, errObj) {  argument
13   assert.throws(() => fs.fchown(1, input), errObj);
14   assert.throws(() => fs.fchownSync(1, input), errObj);
17 function testGid(input, errObj) {  argument
18   assert.throws(() => fs.fchown(1, 1, input), errObj);
19   assert.throws(() => fs.fchownSync(1, 1, input), errObj);
23   const errObj = {  variable
28   testFd(input, errObj);
29   testUid(input, errObj);
30   testGid(input, errObj);
34   const errObj = {  variable
40   testFd(input, errObj);
41   errObj.message = errObj.message.replace('fd', 'uid');
42   testUid(input, errObj);
43   errObj.message = errObj.message.replace('uid', 'gid');
44   testGid(input, errObj);
48   const errObj = {  variable
54   testFd(input, errObj);
55   errObj.message = 'The value of "uid" is out of range. It must be >= -1 && ' +
57   testUid(input, errObj);
58   errObj.message = errObj.message.replace('uid', 'gid');
59   testGid(input, errObj);