Add tests

test/controllers/columns/left_positions_controller_test.rb

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+require "test_helper"
+
+class Columns::LeftPositionsControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    sign_in_as :kevin
+  end
+
+  test "move column left" do
+    collection = collections(:writebook)
+    columns = collection.columns.sorted.to_a
+
+    column_a = columns[0]
+    column_b = columns[1]
+    original_position_a = column_a.position
+    original_position_b = column_b.position
+
+    post column_left_position_path(column_b), as: :turbo_stream
+    assert_response :success
+
+    assert_equal original_position_b, column_a.reload.position
+    assert_equal original_position_a, column_b.reload.position
+  end
+end

test/controllers/columns/right_positions_controller_test.rb

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+require "test_helper"
+
+class Columns::RightPositionsControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    sign_in_as :kevin
+  end
+
+  test "move column right" do
+    collection = collections(:writebook)
+    columns = collection.columns.sorted.to_a
+
+    column_a = columns[0]
+    column_b = columns[1]
+    original_position_a = column_a.position
+    original_position_b = column_b.position
+
+    post column_right_position_path(column_a), as: :turbo_stream
+    assert_response :success
+
+    assert_equal original_position_b, column_a.reload.position
+    assert_equal original_position_a, column_b.reload.position
+  end
+end