Print out error messages for debugging

superglue_rails/test/acceptance/superglue_installation_acceptance.rb

@@ -40,15 +40,23 @@ def setup
   end
 
   def successfully(command, silent = false)
-    silencer = if silent
-      "1>/dev/null"
+    redirection = if silent
+      "1>/dev/null 2>&1"  # Redirect both stdout and stderr to /dev/null
     else
-      ""
+      "2>&1"             # Merge stderr with stdout
     end
 
-    return_value = system("#{command} #{silencer}")
+    # Execute the command with the specified redirection
+    output = `#{command} #{redirection}`
 
-    assert return_value
+    # Check the return status of the command
+    success = $?.success?
+
+    # Raise an error if the command execution was not successful
+    raise "Command '#{command}' failed with error: #{output}" unless success
+
+    # Return the combined output
+    output
   end
 
   def update_package_json
@@ -118,8 +126,8 @@ def test_installation
       FileUtils.rm_rf("testapp")
       generate_test_app_7 "testapp"
       Dir.chdir("testapp") do
-        successfully "bundle install"
         successfully "yarn add react react-dom @babel/preset-react"
+        successfully("bin/rails about")
 
         FileUtils.rm_f("public/index.html")
         install_superglue