Failing unit test in Windows (TestLookupLocalPTR)

[Albert S]

Hello Gophers,

I'm running unit test in my local windows machine (Windows 11 Pro) and I get a test failure for TestLookupLocalPtr using my locally compiled Go 1.25 

here is the test command that I run
PS C:\Users\grand\projects\go\src\net> ../../bin/go test -v ./...

=== RUN   TestLookupLocalPTR
    lookup_windows_test.go:174: different results 192.168.1.56: exp:["host.docker.internal."] got:["gateway.docker.internal.","host.docker.internal."]

Upon checking the unit test, it looks like it's testing whether LookupAddr and lookupPTR retuns the same result

I believe LookupAddr is getting the DNSs by calling Windows API and looking at the  C:\Windows\System32\drivers\etc\hosts

my hosts file indeed has 2 entries for the IP:

# Added by Docker Desktop
192.168.1.56 host.docker.internal
192.168.1.56 gateway.docker.internal

while lookupPTR implementation seems to rely on the output from ping
essentially it's this ping command ping -n -1 -a <addr> and doing a regex matching `(?m)^Pinging\s+([a-zA-Z0-9.\-]+)\s+\[.*$`

I tested the ping command in my windows

(base) C:\Users\grand>ping -n 1 -a 192.168.1.56

Pinging host.docker.internal [192.168.1.56] with 32 bytes of data:
Reply from 192.168.1.56: bytes=32 time<1ms TTL=128

Ping statistics for 192.168.1.56:
    Packets: Sent = 1, Received = 1, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms

And it only produces 1 result

I was about to open an issue in Github, however, I have limited background knowledge for this and I would like some inputs whether this is an issue in the unit test or is an issue in the implementation of some of the functions

Let me know should you require more info

Thank you for your inputs!

[Mark Geisert]

I don't know about the Go aspects of your issue, but in the hosts file it is customary to list the IP address once and the corresponding host and its aliases all on the same line.  There should be a <tab> character between the IP address and the host name(s), and spaces between the names.

HTH,

..mark