Add tests for MultiSpan

- sass/sass-spec#1825

spec/sass_compile_spec.rb

@@ -283,6 +283,18 @@
               end
           end
         end
+
+        it 'with multi-span errors' do
+          sandbox do |dir|
+            url = dir.url('foo.scss')
+            expect { described_class.compile_string('@use "sass:math"; @use "sass:math"', url: url) }
+              .to raise_error do |error|
+                expect(error).to be_a(Sass::CompileError)
+                expect(error.span.start.line).to eq(0)
+                expect(error.span.url).to eq(url)
+              end
+          end
+        end
       end
 
       it 'throws an error for an unrecognized style' do

spec/sass_logger_spec.rb

@@ -11,6 +11,27 @@
     expect(stdio.err).not_to be_empty
   end
 
+  describe 'deprecation warning' do
+    # Regression test for sass/dart-sass#1790
+    it 'passes the message and span to the logger' do
+      described_class.compile_string(
+        '
+        @mixin foo {@warn heck}
+        @include foo;
+        ',
+        logger: {
+          warn: lambda { |message, span:|
+            expect(message).to eq('only valid for nesting')
+            expect(span.start.line).to be(0)
+            expect(span.start.column).to be(0)
+            expect(span.end.line).to be(0)
+            expect(span.end.line).to be(4)
+          }
+        }
+      )
+    end
+  end
+
   describe 'with @warn' do
     it 'passes the message and stack trace to the logger' do
       described_class.compile_string(