Add a clear command to clear filters

test/models/command/clear_filters_test.rb

@@ -0,0 +1,15 @@
+require "test_helper"
+
+class Command::FilterTest < ActionDispatch::IntegrationTest
+  include CommandTestHelper
+
+  setup do
+    Current.session = sessions(:david)
+  end
+
+  test "clear the filters keeping the selected collections" do
+    result = execute_command "/clear", context_url: "?card_ids%5B%5D=1&card_ids%5B%5D=2&collection_ids%5B%5D=#{collections(:writebook).id}&indexed_by=newest&terms%5B%5D=jorge"
+
+    assert_equal cards_path(indexed_by: "newest", collection_ids: [ collections(:writebook).id ]), result.url
+  end
+end