Add autocorrect for Style/UnlessElse

spec/ameba/rule/style/unless_else_spec.cr

@@ -13,7 +13,7 @@ module Ameba::Rule::Style
     end
 
     it "fails if unless has else" do
-      expect_issue subject, <<-CRYSTAL
+      source = expect_issue subject, <<-CRYSTAL
         unless something
         # ^^^^^^^^^^^^^^ error: Favour if over unless with else
           :one
@@ -21,6 +21,14 @@ module Ameba::Rule::Style
           :two
         end
         CRYSTAL
+
+      expect_correction source, <<-CRYSTAL
+        if something
+          :two
+        else
+          :one
+        end
+        CRYSTAL
     end
 
     it "reports rule, pos and message" do

spec/ameba/source_spec.cr

@@ -46,5 +46,22 @@ module Ameba
         s.matches_path?("new_source.cr").should be_false
       end
     end
+
+    describe "#pos" do
+      it "works" do
+        s = Source.new <<-EOS
+          foo
+          bar
+          fizz
+          buzz
+          EOS
+        loc = Crystal::Location.new("", 2, 1)
+        end_loc = Crystal::Location.new("", 3, 4)
+        s.code[s.pos(loc)...s.pos(end_loc, end: true)].should eq <<-EOS
+          bar
+          fizz
+          EOS
+      end
+    end
   end
 end