feat(test): allow gno test to default to the current directory

[Nemanya8]

This PR resolves #3420 by enhancing the gno test command.
The command now assumes the current directory (.) as the default path when no directory is specified, aligning its behavior with go test.

Changes to CI:

• Removed the no_args test.
• Added new tests to cover the following scenarios:
  • Valid test execution.
  • Valid file-based test.
  • Test with flags.
  • Empty directory.
  • Empty test file.

This PR is a repost of #3429 with a cleaner commit history.

CC @notJoon @moul

[Gno2D2]

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[notJoon]

LGTM 👍

remove: review/triage flag

[thehowl]

Could you make it work by simply putting args as []string{"."} when it's empty? The current approach, verifying paths, looks a bit hacky.

[Nemanya8]

Putting args as []string{"."} when it's empty works for simple cases like gno test, but it falls apart once you add flags, because args won't be empty anymore.

I also have to check if ./... is in args, since when you run a command with ./... and no matching packages are found, the paths end up with a length of 0. That would incorrectly make it look like there are no path args, which is a false positive.

So while verifying paths might seem a bit clunky, it’s necessary to handle all these edge cases properly.

[thehowl]

I'd say this and the following test (valid_test) are redundant, I would remove them

[Nemanya8]

I removed those two tests.