Fix SpecStyle to not receive Prism events (#71)

* Calling super will still register for events

The parent class TestDiscovery also registers SpecStyle for Prism event. While handling the events it tries to access a nil variable when entering a class or module and thus completely break code analysis of normal ruby files.

* Added a test to verify expected SpecStyle patch behavior

* Added integration test to verify parsing of a simple ruby file

The improperly patched SpecStyle would fail when the Ruby LSP was
handling a 'textDocument/foldingRange' message (probably others too)
for a source while with module and class blocks as it was still
receiving events from Prism (which we do not want) for the RSpec
addon.

Author: elmuerte

lib/ruby_lsp/ruby_lsp_rspec/spec_style_patch.rb

@@ -7,7 +7,7 @@ module Listeners
     class SpecStyle
       #: (ResponseBuilders::TestCollection, GlobalState, Prism::Dispatcher, URI::Generic) -> void
       def initialize(response_builder, global_state, dispatcher, uri)
-        super
+        # nop
       end
     end
   end

spec/code_lens_spec.rb

@@ -43,6 +43,37 @@
           expect(response[6].data).to eq({ kind: "run_test", arguments: [uri.to_standardized_path, "./spec/fake_spec.rb:1::./spec/fake_spec.rb:2::./spec/fake_spec.rb:3"] })
         end
       end
+
+      it "processes an ordinairy ruby file with module and class blocks" do
+        source = <<~RUBY
+          module RubyLspRSpecTests
+            class ExampleClass
+              def dummy
+                # Test case to verify issue #71
+              end
+            end
+          end
+        RUBY
+
+        with_server(source) do |server, uri|
+          allow(server.global_state).to receive(:enabled_feature?).with(:fullTestDiscovery).and_return(true)
+
+          server.process_message(
+            {
+              id: 1,
+              method: "textDocument/foldingRange",
+              params: {
+                textDocument: { uri: uri },
+                position: { line: 0, character: 0 },
+              },
+            },
+          )
+
+          response = pop_result(server).response
+          expect(response.count).to eq(3)
+          # We are happy if processing the source did not bail with an error
+        end
+      end
     end
 
     context "without full test discovery" do

spec/spec_style_patch_spec.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+RSpec.describe RubyLsp::Listeners::SpecStyle do
+  describe "spec_style_patch" do
+    it "disables initialization" do
+      RubyLsp::Listeners::SpecStyle.new(double("response_builder"), double("global_state"), double("dispatcher"), double("uri"))
+    end
+  end
+end