Test registration idempotency (Tests matrix-org/synapse#649)

tests/11register.pl

@@ -67,3 +67,76 @@
          }),
       )
    };
+
+test "registration is idempotent",
+   requires => [ $main::API_CLIENTS[0] ],
+
+   do => sub {
+      my ( $http ) = @_;
+
+      my $session;
+      my $user_id;
+
+      # Start a session
+      $http->do_request_json(
+         method => "POST",
+         uri    => "/r0/register",
+
+         content => {
+            password => "s3kr1t",
+         },
+      )->main::expect_http_401->then( sub {
+         my ( $response ) = @_;
+
+         my $body = decode_json $response->content;
+
+         assert_json_keys( $body, qw( session ));
+
+         $session = $body->{session};
+
+         # Now register a user
+         $http->do_request_json(
+            method => "POST",
+            uri    => "/r0/register",
+
+            content => {
+               password => "s3kr1t",
+               auth     => {
+                  session => $session,
+                  type    => "m.login.dummy",
+               }
+            },
+         );
+      })->then( sub {
+         my ( $body ) = @_;
+
+         # check that worked okay...
+         assert_json_keys( $body, qw( user_id home_server access_token refresh_token ));
+
+         $user_id = $body->{user_id};
+
+         # now try to register again with the same session
+         $http->do_request_json(
+            method => "POST",
+            uri    => "/r0/register",
+
+            content => {
+               password => "s3kr1t",
+               auth     => {
+                  session => $session,
+                  type    => "m.login.dummy",
+               }
+            },
+         );
+      })->then( sub {
+         my ( $body ) = @_;
+
+         # we should have got an equivalent response
+         # (ie. success, and the same user id)
+         assert_json_keys( $body, qw( user_id home_server access_token refresh_token ));
+
+         assert_eq( $body->{user_id}, $user_id );
+
+         Future->done( 1 );
+      });
+   };