Show options when a test fails when running specs

examples/nested-jsbeautifyrc/.jsbeautifyrc

@@ -18,7 +18,6 @@
     indent_char: " "
     indent_size: 2
     preserve_newlines: true
-    # newline_between_rules: true
   js:
     indent_size: 2
     indent_char: " "

spec/beautify-languages-spec.coffee

@@ -183,8 +183,15 @@ describe "BeautifyLanguages", ->
                               newStr=expectedContents
                               oldHeader="beautified"
                               newHeader="expected"
-                              diff = JsDiff.createPatch(fileName, oldStr, newStr, oldHeader, newHeader)
+                              diff = JsDiff.createPatch(fileName, oldStr, \
-                              expect(text).toEqual(expectedContents, "Beautifier output does not match expected output:\n"+diff)
+                                newStr, oldHeader, newHeader)
+                              opts = beautifier.getOptions(allOptions, \
+                                grammarName, testFileName)
+                              expect(text).toEqual(expectedContents, \
+                                "Beautifier output does not match expected \
+                                output:\n#{diff}\n\n\
+                                With options:\n\
+                                #{JSON.stringify(opts, undefined, 4)}")
                           # All done!
                           beautifyCompleted = true
 

src/beautifiers/index.coffee

@@ -289,6 +289,22 @@ module.exports = class Beautifiers extends EventEmitter
             _.contains(beautifier.languages, language)
         )
 
+    getOptions : (allOptions, grammar, filePath) ->
+        # Get language
+        fileExtension = path.extname(filePath)
+        # Remove prefix "." (period) in fileExtension
+        fileExtension = fileExtension.substr(1)
+        languages = @languages.getLanguages({grammar, extension: fileExtension})
+        logger.verbose(languages, grammar, fileExtension)
+        # Check if unsupported language
+        if languages.length < 1
+            return null
+        else
+            # TODO: select appropriate language
+            language = languages[0]
+            # Options for Language
+            options = @getOptions([language.namespace]\
+                .concat(language.fallback or []), allOptions) or {}
 
     beautify : (text, allOptions, grammar, filePath, {onSave} = {}) ->
         return Promise.all(allOptions)