Clarify expectation on XML indentation in AnLocalizeLibsAction spec

Author: mokagio

spec/an_localize_libs_action_spec.rb

@@ -26,24 +26,28 @@
         ]
       )
 
-      # Notice the extra indentation in the library strings. The action doesn't
-      # modify the app's strings content indentation, but it applies its own
-      # standard to the values read from the given library strings
       expected = <<~XML
         <string name="a_string">test from app</string>
-          <string name="a_lib1_string">test from lib 1</string>
-          <string name="a_lib2_string">test from lib 2</string>
+        <string name="a_lib1_string">test from lib 1</string>
+        <string name="a_lib2_string">test from lib 2</string>
       XML
       expect(File.read(app_strings_path)).to eq(android_xml_with_content(expected))
     end
   end
 end
 
 def android_xml_with_content(content)
+  # Under the hood, the code hardcodes the generated XML indentation as 4
+  # spaces. Let's "force" it to be the same in here for consistency.
+  #
+  # See
+  # https://github.com/wordpress-mobile/release-toolkit/blob/da405f2c5ca90d696857ba2ad01da2753daa60dc/lib/fastlane/plugin/wpmreleasetoolkit/helper/android/android_localize_helper.rb#L67
+  default_indentation = ' ' * 4
+
   # I couldn't find a way to interpolate a multiline string preserving its
   # indentation in the heredoc below, so I hacked the following transformation
   # of the input that adds the desired indentation to all lines.
-  indented_content = content.chomp.lines.map { |l| "  #{l}" }.join
+  indented_content = content.chomp.lines.map { |l| "#{default_indentation}#{l}" }.join
 
   return <<~XML
     <?xml version="1.0" encoding="UTF-8"?>