Add command to filter by tag

test/models/command/filter_by_tag_test.rb

@@ -0,0 +1,15 @@
+require "test_helper"
+
+class Command::FilterByCardTest < ActionDispatch::IntegrationTest
+  include CommandTestHelper
+
+  setup do
+    @tag = tags(:web)
+  end
+
+  test "redirects to the cards index filtering by cards" do
+    result = execute_command "##{@tag.title}"
+
+    assert_equal cards_path(indexed_by: "newest", tag_ids: [ @tag.id ]), result.url
+  end
+end