FEATURE: Add site setting and wizard step to set base font (#10250)

Co-authored-by: Neil Lalonde <neillalonde@gmail.com>

spec/components/wizard/step_updater_spec.rb

@@ -167,6 +167,16 @@ describe Wizard::StepUpdater do
     end
   end
 
+  context "fonts step" do
+    it "updates the font" do
+      updater = wizard.create_updater('fonts', font_previews: 'open_sans')
+      updater.update
+      expect(updater.success?).to eq(true)
+      expect(wizard.completed_steps?('fonts')).to eq(true)
+      expect(SiteSetting.base_font).to eq('open_sans')
+    end
+  end
+
   context "colors step" do
     context "with an existing color scheme" do
       fab!(:color_scheme) { Fabricate(:color_scheme, name: 'existing', via_wizard: true) }

spec/components/wizard/wizard_builder_spec.rb

@@ -41,6 +41,15 @@ describe Wizard::Builder do
     expect(invites_step.disabled).to be_truthy
   end
 
+  context 'fonts step' do
+    let(:fonts_step) { wizard.steps.find { |s| s.id == 'fonts' } }
+    let(:field) { fonts_step.fields.first }
+
+    it 'should set the right font' do
+      expect(field.choices.size).to eq(DiscourseFonts.fonts.size)
+    end
+  end
+
   context 'logos step' do
     let(:logos_step) { wizard.steps.find { |s| s.id == 'logos' } }