Remove trend initialization from Series model to streamline value calculations.

Added initial pass at onboarding system tests.

test/system/onboardings_test.rb

@@ -0,0 +1,192 @@
+require "application_system_test_case"
+
+class OnboardingsTest < ApplicationSystemTestCase
+  setup do
+    @user = users(:family_admin)
+    @family = @user.family
+
+    # Reset onboarding state
+    @user.update!(set_onboarding_preferences_at: nil)
+
+    sign_in @user
+  end
+
+  test "can complete the full onboarding flow" do
+    # Start at the main onboarding page
+    visit onboarding_path
+
+    assert_text "Let's set up your account"
+    assert_button "Get started"
+
+    # Navigate to preferences
+    click_button "Get started"
+
+    assert_current_path preferences_onboarding_path
+    assert_text "Set your preferences"
+
+    # Test that the chart renders without errors (this would catch the Series bug)
+    assert_selector "[data-controller='time-series-chart']"
+
+    # Fill out preferences form
+    select "English", from: "user_family_attributes_locale"
+    select "United States Dollar (USD)", from: "user_family_attributes_currency"
+    select "MM/DD/YYYY", from: "user_family_attributes_date_format"
+    select "Light", from: "user_theme"
+
+    # Submit preferences
+    click_button "Continue"
+
+    # Should redirect to goals page
+    assert_current_path goals_onboarding_path
+    assert_text "What brings you to Maybe?"
+  end
+
+  test "preferences page renders chart without errors" do
+    visit preferences_onboarding_path
+
+    # This test specifically targets the Series model bug
+    # The chart should render without throwing JavaScript errors
+    assert_selector "[data-controller='time-series-chart']"
+    assert_selector "#previewChart"
+
+    # Verify the chart data is properly formatted JSON
+    chart_element = find("[data-controller='time-series-chart']")
+    chart_data = chart_element["data-time-series-chart-data-value"]
+
+    # Should be valid JSON
+    assert_nothing_raised do
+      JSON.parse(chart_data)
+    end
+
+    # Verify the preview example shows
+    assert_text "Example"
+    assert_text "$2,325.25"
+    assert_text "+$78.90"
+  end
+
+  test "can change currency and see preview update" do
+    visit preferences_onboarding_path
+
+    # Change currency
+    select "Euro (EUR)", from: "user_family_attributes_currency"
+
+    # The preview should update (this tests the JavaScript controller)
+    # Note: This would require the onboarding controller to handle currency changes
+    assert_text "Example"
+  end
+
+  test "can change date format and see preview update" do
+    visit preferences_onboarding_path
+
+    # Change date format
+    select "DD/MM/YYYY", from: "user_family_attributes_date_format"
+
+    # The preview should update
+    assert_text "Example"
+  end
+
+  test "can change theme" do
+    visit preferences_onboarding_path
+
+    # Change theme
+    select "Dark", from: "user_theme"
+
+    # Theme should be applied (this tests the JavaScript controller)
+    assert_text "Example"
+  end
+
+  test "preferences form validation" do
+    visit preferences_onboarding_path
+
+    # Clear required fields and try to submit
+    select "", from: "user_family_attributes_locale"
+    click_button "Continue"
+
+    # Should stay on preferences page with validation errors
+    assert_current_path preferences_onboarding_path
+  end
+
+  test "preferences form saves data correctly" do
+    visit preferences_onboarding_path
+
+    # Fill out form with specific values
+    select "Spanish", from: "user_family_attributes_locale"
+    select "Euro (EUR)", from: "user_family_attributes_currency"
+    select "DD/MM/YYYY", from: "user_family_attributes_date_format"
+    select "Dark", from: "user_theme"
+
+    click_button "Continue"
+
+    # Verify data was saved
+    @family.reload
+    @user.reload
+
+    assert_equal "es", @family.locale
+    assert_equal "EUR", @family.currency
+    assert_equal "DD/MM/YYYY", @family.date_format
+    assert_equal "dark", @user.theme
+    assert_not_nil @user.set_onboarding_preferences_at
+  end
+
+  test "goals page renders correctly" do
+    # Complete preferences first
+    @user.update!(set_onboarding_preferences_at: Time.current)
+
+    visit goals_onboarding_path
+
+    assert_text "What brings you to Maybe?"
+    assert_button "Continue"
+  end
+
+  test "trial page renders correctly" do
+    visit trial_onboarding_path
+
+    assert_text "trial" # Adjust based on actual content
+  end
+
+  test "navigation between onboarding steps" do
+    # Start at main onboarding
+    visit onboarding_path
+    click_button "Get started"
+
+    # Should be at preferences
+    assert_current_path preferences_onboarding_path
+
+    # Complete preferences
+    select "English", from: "user_family_attributes_locale"
+    select "United States Dollar (USD)", from: "user_family_attributes_currency"
+    select "MM/DD/YYYY", from: "user_family_attributes_date_format"
+    click_button "Continue"
+
+    # Should be at goals
+    assert_current_path goals_onboarding_path
+  end
+
+  test "onboarding nav shows correct steps" do
+    visit preferences_onboarding_path
+
+    # Check that navigation shows current step
+    assert_selector ".onboarding-nav" # Adjust selector based on actual implementation
+  end
+
+  test "logout option is available during onboarding" do
+    visit preferences_onboarding_path
+
+    # Should have logout option
+    assert_link "Sign out" # Adjust based on actual implementation
+  end
+
+  private
+
+    def sign_in(user)
+      visit new_session_path
+      within "form" do
+        fill_in "Email", with: user.email
+        fill_in "Password", with: user_password_test
+        click_on "Log in"
+      end
+
+      # Wait for successful login
+      assert_current_path root_path
+end
+end