Add view test for header

spec/views/header_spec.rb

@@ -0,0 +1,34 @@
+require 'rails_helper'
+
+RSpec.describe 'header', type: :view do
+  let(:board1) { FactoryBot.create(:board) }
+  let(:board2) { FactoryBot.create(:board) }
+
+  def render_header
+    render partial: 'layouts/header'
+  end
+
+  it 'renders a logo' do
+    render_header
+
+    expect(rendered).to have_selector('.navbar-brand')
+  end
+
+  it 'renders a link for each board' do
+    @boards = [board1, board2]
+
+    render_header
+
+    expect(rendered).to have_content(board1.name)
+    expect(rendered).to have_content(board2.name)
+  end
+
+  it 'applies "active" class to the active board link' do
+    @boards = [board1, board2]
+    @board = board1 # active board is board1
+
+    render_header
+
+    expect(rendered).to have_selector('.active', count: 1)
+  end
+end