Add test coverage for for InertiaRailsContrib::GeneratorsHelper#guess_the_default_framework

Author: brodienguyen

spec/generators/generators_helper_spec.rb

@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+require 'thor'
+require_relative '../../lib/inertia_rails/generators/helper'
+
+RSpec.describe InertiaRails::Generators::Helper, type: :helper do
+  describe '#guess_the_default_framework' do
+    let(:package_json_path) { Pathname.new(File.expand_path("spec/fixtures/package_json_files/#{fixture_file_name}", Dir.pwd)) }
+
+    shared_examples 'framework detection' do |file_name, expected_framework|
+      let(:fixture_file_name) { file_name }
+
+      it "returns #{expected_framework.inspect} when inspect \"#{file_name}\"" do
+        expect(described_class.guess_the_default_framework(package_json_path)).to eq(expected_framework)
+      end
+    end
+
+    it_behaves_like 'framework detection', 'react_package.json', 'react'
+    it_behaves_like 'framework detection', 'svelte5_caret_package.json', 'svelte'
+    it_behaves_like 'framework detection', 'svelte5_exact_package.json', 'svelte'
+    it_behaves_like 'framework detection', 'svelte5_tilde_package.json', 'svelte'
+    it_behaves_like 'framework detection', 'svelte4_package.json', 'svelte4'
+    it_behaves_like 'framework detection', 'vue_package.json', 'vue'
+
+    # Handle exception
+    context 'when framework cannot be determined' do
+      let(:fixture_file_name) { 'empty_package.json' }
+
+      it 'raises an error' do
+        allow(described_class).to receive(:exit) # Prevent `exit` from terminating the test
+        expect(Thor::Shell::Basic).to receive_message_chain(:new, :say_error)
+          .with('Could not determine the Inertia.js framework you are using.')
+        described_class.guess_the_default_framework(package_json_path)
+      end
+    end
+  end
+end