Add Braintree to the installer as a payment method option

Closes solidusio#4749.

core/lib/generators/solidus/install/app_templates/payment_method/braintree.rb

@@ -0,0 +1,6 @@
+unless Bundler.locked_gems.dependencies['solidus_braintree']
+  version = @selected_frontend == 'classic' ? "--version='~> 1.2'" : "--git='https://github.com/solidusio/solidus_braintree' --branch='master'"
+  bundle_command "add solidus_braintree #{version}"
+end
+
+generate 'solidus_braintree:install'

core/lib/generators/solidus/install/install_generator.rb

@@ -32,6 +32,7 @@ class InstallGenerator < Rails::Generators::AppBase
     PAYMENT_METHODS = %w[
       paypal
       bolt
+      braintree
       none
     ]
 
@@ -322,10 +323,12 @@ def detect_authentication_to_install
     def detect_payment_method_to_install
       return 'paypal' if Bundler.locked_gems.dependencies['solidus_paypal_commerce_platform']
       return 'bolt' if Bundler.locked_gems.dependencies['solidus_bolt']
+      return 'braintree' if Bundler.locked_gems.dependencies['solidus_braintree']
 
       payment_methods_hash = {
         'paypal' => "- [#{set_color 'paypal', :bold}] Install `solidus_paypal_commerce_platform` (#{set_color :default, :bold}).",
         'bolt' => "- [#{set_color 'bolt', :bold}] Install `solidus_bolt`.",
+        'braintree' => "- [#{set_color 'braintree', :bold}] Install `solidus_braintree`.",
         'none' => "- [#{set_color 'none', :bold}] Skip installing a payment method.",
       }
 

core/spec/generators/solidus/install/install_generator_spec.rb

@@ -106,10 +106,11 @@
         generator.prepare_options
 
         expect(questions.size).to eq(1)
-        expect(questions.first[:limited_to]).to eq(['paypal', 'bolt', 'none'])
+        expect(questions.first[:limited_to]).to eq(['paypal', 'bolt', 'braintree', 'none'])
         expect(questions.first[:default]).to eq('paypal')
         expect(strip_ansi questions.first[:desc]).to include('[paypal]')
         expect(strip_ansi questions.first[:desc]).to include('[bolt]')
+        expect(strip_ansi questions.first[:desc]).to include('[braintree]')
         expect(strip_ansi questions.first[:desc]).to include('[none]')
       end
 
@@ -121,10 +122,11 @@
         generator.prepare_options
 
         expect(questions.size).to eq(1)
-        expect(questions.first[:limited_to]).to eq(['paypal', 'none'])
+        expect(questions.first[:limited_to]).to eq(['paypal', 'braintree', 'none'])
         expect(questions.first[:default]).to eq('paypal')
         expect(strip_ansi questions.first[:desc]).to include('[paypal]')
         expect(strip_ansi questions.first[:desc]).not_to include('[bolt]')
+        expect(strip_ansi questions.first[:desc]).to include('[braintree]')
         expect(strip_ansi questions.first[:desc]).to include('[none]')
       end
     end