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/setup-notifications-jobset.pl

@@ -0,0 +1,56 @@
+use LWP::UserAgent;
+use JSON;
+
+my $ua = LWP::UserAgent->new;
+$ua->cookie_jar({});
+
+sub request_json {
+    my ($opts) = @_;
+    my $req = HTTP::Request->new;
+    $req->method($opts->{method} or "GET");
+    $req->uri("http://localhost:3000$opts->{uri}");
+    $req->header(Accept => "application/json");
+    $req->header(Referer => "http://localhost:3000/") if $opts->{method} eq "POST";
+    $req->content(encode_json($opts->{data})) if defined $opts->{data};
+    my $res = $ua->request($req);
+    print $res->as_string();
+    return $res;
+}
+
+my $result = request_json({
+  uri => "/login",
+  method => "POST",
+  data => {
+    username => "root",
+    password => "foobar"
+  }
+});
+
+$result = request_json({
+  uri => '/project/sample',
+  method => 'PUT',
+  data => {
+    displayname => "Sample",
+    enabled => "1",
+    visible => "1",
+  }
+});
+
+$result = request_json({
+  uri => '/jobset/sample/default',
+  method => 'PUT',
+  data => {
+    nixexprpath => "default.nix",
+    nixexprinput => "my-src",
+    inputs => {
+      "my-src" => {
+        type => "path",
+        value => "/run/jobset"
+      }
+    },
+    enabled => "1",
+    visible => "1",
+    checkinterval => "5",
+    keepnr => 1
+  }
+});