test: improve assert message for debugging

[Trott]

Checklist

• tests and code linting passes
• the commit message follows commit guidelines

Affected core subsystem(s)

test

Description of change

Previously, the assertion changed in this commit would print the same
message no matter which of the four test cases failed. The assert has
been changed so that it will indicate which test case failed.

Refs: #6577

[addaleax]

LGTM

[santigimeno]

LGTM

[jasnell]

LGTM

[mcollina]

LGTM

[mcollina]

@Trott while you are at it, you should update the allocation of the buffers to the new method, like what was done for the ipv4 equivalent: https://github.com/nodejs/node/blob/master/test/parallel/test-dgram-send-default-host.js#L9-L12

[JacksonTian]

LGTM

[mcollina]

I think the commit message needs to be a little more explicative
Il giorno gio 5 mag 2016 alle 11:44 Jackson Tian notifications@github.com
ha scritto:

LGTM

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#6581 (comment)

[cjihrig]

LGTM

[jasnell]

CI: https://ci.nodejs.org/job/node-test-pull-request/2528/

[addaleax]

If @Trott is okay with that, this should probably be not be landed in favour of #6607. This PR served its purpose well enough. :)

[jasnell]

SGTM

[Trott]

If @Trott is okay with that, this should probably be not be landed in favour of #6607.

I agree. Closing this one.