added failing (and passing?) tests

spec/language_server/message/text_document/rename_spec.rb

@@ -24,4 +24,92 @@ class Foo
     rename.process
     expect(rename.result[:changes]['file:///file.rb'].length).to eq(2)
   end
+
+  it "renames an argument symbol from method signature" do
+    host = Solargraph::LanguageServer::Host.new
+    host.start
+    host.open('file:///file.rb', %(
+      class Example
+      def foo(bar)
+      bar += 1
+      return bar
+      end
+    	end
+    	), 1)
+    	rename = Solargraph::LanguageServer::Message::TextDocument::Rename.new(host, {
+      'id' => 1,
+      'method' => 'textDocument/rename',
+      'params' => {
+        'textDocument' => {
+          'uri' => 'file:///file.rb'
+        },
+        'position' => {
+          'line' => 2,
+          'character' => 14
+        },
+        'newName' => 'baz'
+      }
+    })
+    rename.process
+    expect(rename.result[:changes]['file:///file.rb'].length).to eq(3)
+  end
+
+  it "renames an argument symbol from method body" do
+    host = Solargraph::LanguageServer::Host.new
+    host.start
+    host.open('file:///file.rb', %(
+      class Example
+      def foo(bar)
+      bar += 1
+      return bar
+      end
+    	end
+    	), 1)
+    	rename = Solargraph::LanguageServer::Message::TextDocument::Rename.new(host, {
+      'id' => 1,
+      'method' => 'textDocument/rename',
+      'params' => {
+        'textDocument' => {
+          'uri' => 'file:///file.rb'
+        },
+        'position' => {
+          'line' => 3,
+          'character' => 6
+        },
+        'newName' => 'baz'
+      }
+    })
+    rename.process
+    expect(rename.result[:changes]['file:///file.rb'].length).to eq(3)
+  end
+
+  it "renames namespace symbol with proper range" do
+    host = Solargraph::LanguageServer::Host.new
+    host.start
+    host.open('file:///file.rb', %(
+      module Namespace; end
+      class Namespace::ExampleClass
+      end
+      obj = Namespace::ExampleClass.new
+    	), 1)
+    	rename = Solargraph::LanguageServer::Message::TextDocument::Rename.new(host, {
+      'id' => 1,
+      'method' => 'textDocument/rename',
+      'params' => {
+        'textDocument' => {
+          'uri' => 'file:///file.rb'
+        },
+        'position' => {
+          'line' => 2,
+          'character' => 12
+        },
+        'newName' => 'Nameplace'
+      }
+    })
+    rename.process
+    changes = rename.result[:changes]['file:///file.rb']
+    expect(changes.length).to eq(3)
+    expect(changes.first[:range][:start][:character]).to eq(13)
+    expect(changes.first[:range][:end][:character]).to eq(22)
+  end
 end