tests: move to t, allow yath test from root

By moving the tests subdirectory to t, we gain the ability to run `yath
test` with no arguments from inside `nix develop` in the root of the
the repo.

(`nix develop` is necessary in order to set the proper env vars for
`yath` to find our test libraries.)

t/input-types/git-rev.t

@@ -0,0 +1,29 @@
+use strict;
+use Setup;
+use TestScmInput;
+
+my %ctx = test_init();
+
+require Hydra::Schema;
+require Hydra::Model::DB;
+
+use Test2::V0;
+
+my $db = Hydra::Model::DB->new;
+hydra_setup($db);
+
+# Tests the creation of a Hydra jobset using a git revision as input.
+testScmInput(
+  type => 'git',
+  name => 'git-rev',
+  expr => 'git-rev-input.nix',
+  uri => 'git-repo 7f60df502b96fd54bbfa64dd94b56d936a407701',
+  update => 'jobs/git-rev-update.sh',
+
+  # directories
+  datadir => $ctx{tmpdir},
+  testdir => $ctx{testdir},
+  jobsdir => $ctx{jobsdir},
+);
+
+done_testing;