Extract sorbet_syntax_check!

lib/tapioca/helpers/sorbet_helper.rb

@@ -22,6 +22,25 @@ def sorbet(*sorbet_args)
       SPOOM_CONTEXT.srb(sorbet_args.join(" "), sorbet_bin: sorbet_path)
     end
 
+    #: (String, rbi_mode: bool) { (String stderr) -> void } -> void
+    def sorbet_syntax_check!(source, rbi_mode:, &on_failure)
+      quoted_source = "\"#{source}\""
+
+      result = if rbi_mode
+        # --e-rbi cannot be used on its own, so we pass a dummy value like `-e ""`
+        sorbet("--no-config", "--stop-after=parser", "-e", '""', "--e-rbi", quoted_source)
+      else
+        sorbet("--no-config", "--stop-after=parser", "-e", quoted_source)
+      end
+
+      unless result.status
+        stderr = result.err #: as !nil
+        on_failure.call(stderr)
+      end
+
+      nil
+    end
+
     #: -> String
     def sorbet_path
       sorbet_path = ENV.fetch(SORBET_EXE_PATH_ENV_VAR, SORBET_BIN)

lib/tapioca/helpers/test/dsl_compiler.rb

@@ -94,20 +94,14 @@ def rbi_for(constant_name, compiler_options: {})
             compiler.decorate
 
             rbi = Tapioca::DEFAULT_RBI_FORMATTER.print_file(file)
-            result = sorbet(
-              "--no-config",
-              "--stop-after=parser",
-              "-e",
-              "\"#{rbi}\"",
-            )
 
-            unless result.status
+            sorbet_syntax_check!(rbi, rbi_mode: true) do |stderr|
               raise(SyntaxError, <<~MSG)
                 Expected generated RBI file for `#{constant_name}` to not have any parsing errors.
 
                 Got these parsing errors:
 
-                #{result.err}
+                #{stderr}
               MSG
             end