Basic lucius test cases at rules charset

[isao-takejib]

Related #48

• Fix css.tmLanguage.json so that @charset can be tested even if it contains a header line for testing.
• However, if there is a blank line, the test will fail. (Changes)
  • fail

    // SYNTAX TEST "source.yesod.lucius" "at-charset"
    
    @charset "utf-8";
    // <-  meta.at-rule.charset.css keyword.control.at-rule.charset.css punctuation.definition.keyword.css
    // <~-------  meta.at-rule.charset.css keyword.control.at-rule.charset.css
    // <~~~~~~~~~-  meta.at-rule.charset.css string.quoted.double.css punctuation.definition.string.begin.css
    // <~~~~~~~~~~-----  meta.at-rule.charset.css string.quoted.double.css
    // <~~~~~~~~~~~~~~~-  meta.at-rule.charset.css string.quoted.double.css punctuation.definition.string.end.css
    // <~~~~~~~~~~~~~~~~-  meta.at-rule.charset.css punctuation.terminator.rule.css
    

  • success

    // SYNTAX TEST "source.yesod.lucius" "at-charset"
    @charset "utf-8";
    // <-  meta.at-rule.charset.css keyword.control.at-rule.charset.css punctuation.definition.keyword.css
    // <~-------  meta.at-rule.charset.css keyword.control.at-rule.charset.css
    // <~~~~~~~~~-  meta.at-rule.charset.css string.quoted.double.css punctuation.definition.string.begin.css
    // <~~~~~~~~~~-----  meta.at-rule.charset.css string.quoted.double.css
    // <~~~~~~~~~~~~~~~-  meta.at-rule.charset.css string.quoted.double.css punctuation.definition.string.end.css
    // <~~~~~~~~~~~~~~~~-  meta.at-rule.charset.css punctuation.terminator.rule.css
    

[isao-takejib]

// SYNTAX TEST "source.yesod.lucius" "at-charset"

@charset "utf-8";
// <-  meta.at-rule.charset.css keyword.control.at-rule.charset.css punctuation.definition.keyword.css
// <~-------  meta.at-rule.charset.css keyword.control.at-rule.charset.css
// <~~~~~~~~~-  meta.at-rule.charset.css string.quoted.double.css punctuation.definition.string.begin.css
// <~~~~~~~~~~-----  meta.at-rule.charset.css string.quoted.double.css
// <~~~~~~~~~~~~~~~-  meta.at-rule.charset.css string.quoted.double.css punctuation.definition.string.end.css
// <~~~~~~~~~~~~~~~~-  meta.at-rule.charset.css punctuation.terminator.rule.css

The reasons why the test cases were failing are as follows.

• The test starts from the next line of the header line. In the example above, the test starts from the second blank line.
• However, the test fails because there is a string (a newline character) preceding the @charset.

Therefore, the test failure in this example is a correct behavior.