Add command to close cards

https://3.basecamp.com/2914079/buckets/37331921/todos/8620236700

test/models/command/assign_test.rb

@@ -17,7 +17,7 @@ class Command::AssignTest < ActionDispatch::IntegrationTest
     assert_includes @card.assignees, users(:kevin)
   end
 
-  test "assigns card on cards' index page" do
+  test "assigns cards on cards' index page" do
     execute_command "/assign @kevin @david", context_url: collection_cards_url(@card.collection)
 
     cards(:logo, :text, :layout).each do |card|

test/models/command/close_test.rb

@@ -0,0 +1,51 @@
+require "test_helper"
+
+class Command::CloseTest < ActionDispatch::IntegrationTest
+  include CommandTestHelper
+
+  setup do
+    Current.session = sessions(:david)
+    @card = cards(:text)
+  end
+
+  test "closes card on perma" do
+    assert_changes -> { @card.reload.closed? }, from: false, to: true do
+      execute_command "/close", context_url: collection_card_url(@card.collection, @card)
+    end
+
+    assert_equal Closure::Reason.default, @card.closure.reason
+    assert_equal users(:david), @card.closed_by
+  end
+
+  test "closes card on perma with reason" do
+    assert_changes -> { @card.reload.closed? }, from: false, to: true do
+      execute_command "/close Not now", context_url: collection_card_url(@card.collection, @card)
+    end
+
+    assert_equal users(:david), @card.closed_by
+    assert_equal "Not now", @card.closure.reason
+  end
+
+  test "closes cards on cards' index page" do
+    cards_to_check = cards(:logo, :text, :layout)
+    cards_to_check.each(&:reopen)
+
+    execute_command "/close", context_url: collection_cards_url(@card.collection)
+
+    cards_to_check.each { it.reload.closed? }
+  end
+
+  test "undo closing" do
+    cards_to_check = cards(:logo, :text, :layout)
+    cards_to_check.each(&:reopen)
+
+    command = parse_command "/close", context_url: collection_cards_url(@card.collection)
+    command.execute
+
+    cards_to_check.each { it.reload.closed? }
+
+    command.undo
+
+    cards_to_check.each { it.reload.open? }
+  end
+end