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Run only one subtest with Test::More

Apply this patch to Test/More.pm, version 1.302075:

807d806
<     return if exists $ENV{SUBTEST} && $ENV{SUBTEST} ne $_[0];

Here's that patch again, in unified format:

$ diff -u Test/More.pm{,.orig}
--- Test/More.pm      2017-07-27 13:23:56.000000000 +0100
+++ Test/More.pm.orig 2017-07-27 13:19:00.000000000 +0100
@@ -804,7 +804,6 @@

 sub subtest {
     my $tb = Test::More->builder;
+    return if exists $ENV{SUBTEST} && $ENV{SUBTEST} ne $_[0];
     return $tb->subtest(@_);
 }

Run the test like this:

SUBTEST="put name of subtest here" /usr/bin/prove -v test_file.t