Tests: restructure to more closely mirror the sources

t/ had lots of directories and files mirroring src/lib/Hydra. This moves
those files under t/Hydra

t/Hydra/Event.t

@@ -0,0 +1,23 @@
+use strict;
+use warnings;
+use Hydra::Event;
+
+use Test2::V0;
+use Test2::Tools::Exception;
+
+subtest "Event: new event" => sub {
+    my $event = Hydra::Event->new_event("build_started", "19");
+    is($event->{'payload'}, "19");
+    is($event->{'channel_name'}, "build_started");
+    is($event->{'event'}->{'build_id'}, 19);
+};
+
+subtest "Payload type: bogus" => sub {
+    like(
+        dies { Hydra::Event::parse_payload("bogus", "") },
+        qr/Invalid channel name/,
+        "bogus channel"
+    );
+};
+
+done_testing;