Add columns

test/models/column_test.rb

@@ -0,0 +1,9 @@
+require "test_helper"
+
+class ColumnTest < ActiveSupport::TestCase
+  test "creates column with default color when color not provided" do
+    column = collections(:writebook).columns.create!(name: "New Column")
+
+    assert_equal Card::DEFAULT_COLOR, column.color
+  end
+end