Prevent subspecs from specifying scheme configuration

CHANGELOG.md

@@ -7,6 +7,7 @@
 * DSL for `scheme` support.  
   [Dimitris Koutsogiorgas](https://github.com/dnkoutso)
   [#7577](https://github.com/CocoaPods/CocoaPods/issues/7577)
+  [#479](https://github.com/CocoaPods/Core/pull/479)
 
 * Replace `test_only` attribute option with `spec_types`.  
   [Dimitris Koutsogiorgas](https://github.com/dnkoutso)

lib/cocoapods-core/specification/linter.rb

@@ -418,6 +418,9 @@ def _validate_script_phases(s)
       # Performs validation related to the `scheme` attribute.
       #
       def _validate_scheme(s)
+        if consumer.spec.subspec? && consumer.spec.library_specification?
+          results.add_error('scheme', 'Scheme configuration is not currently supported for subspecs.')
+        end
         if s.key?(:launch_arguments) && !s[:launch_arguments].is_a?(Array)
           results.add_error('scheme', 'Expected an array for key `launch_arguments`.')
         end

spec/specification/linter_spec.rb

@@ -610,6 +610,13 @@ def result_should_include(*values)
 
       #------------------#
 
+      it 'fails if a subspec specifies a scheme' do
+        @subspec.scheme = { :launch_arguments => ['Arg1'] }
+        result_should_include('scheme', 'Scheme configuration is not currently supported for subspecs.')
+      end
+
+      #------------------#
+
       it 'fails a specification with a subspec with a module map' do
         @subspec.module_map = 'subspec.modulemap'
         result_should_include('module_map', 'can\'t set', 'for subspecs')