Convert t/mojolicious/command.t to use subtests

[kathackeray]

Summary

The file t/mojolicious/command.t has been organised into subtests, and spacing added to create blocks within.

Note that the following variables were originally global, but have now been scoped to each subtest requiring them:

• $buffer
• $template
• $command
• $cwd
• $dir

Motivation

Towards resolution of #1520

References

Refer to discussion in #1520

[kathackeray]

mojo/t/mojolicious/command.t

Lines 9 to 11 in 14107da

	my $command = Mojolicious::Command->new;
	my $cwd = path;
	my $dir = tempdir;

I had intentionally left the above shared variables in the global scope to be used between tests, as they were never modified. Following advice in #1914, I have removed these and duplicated them into the subtest scopes.

Ready for review.

[kiwiroy]

LGTM

[jhthorsen]

Looks good to me

[marcusramberg]

lgtm