Test all features

Add cases for attribute highlight on and off, block syntax by lang
and emmet-vim group names, OnChangeVueSyntax(), matchit, .wpy,
initial_indent as syntax and tag.syntax, and syntax after reloading.

Also check indenting a file after removing all indent with
g:test_flatten, which fails before the end tag fix as closing tags at
column 0 were taken as block end tags.

test/cases/example.vim

@@ -13,3 +13,28 @@ let g:vim_vue_plugin_config = {
       \'foldexpr': 1,
       \'full_syntax': ['scss', 'less'],
       \}
+
+" Block tag, syntax by lang="..." or the first in config, and block group
+" with css prefix for emmet-vim
+function! Check()
+  call ExpectBlock('div.set', 'template', 'pug', 'pugTemplateBlock')
+  call ExpectBlock('<template></template>', 'template', 'html', 'htmlTemplateBlock')
+  call ExpectBlock('export default', 'script', 'javascript', 'javascriptScriptBlock')
+  call ExpectBlock('import Vue', 'script', 'typescript', 'typescriptScriptBlock')
+  call ExpectBlock('# Assignment', 'script', 'coffee', 'coffeeScriptBlock')
+  call ExpectBlock('p {', 'style', 'css', 'cssStyleBlock')
+  call ExpectBlock('$a: 100px', 'style', 'scss', 'cssScssStyleBlock')
+  call ExpectBlock('$w: 128px', 'style', 'sass', 'sassStyleBlock')
+  call ExpectBlock('@list: 10 12', 'style', 'less', 'cssLessStyleBlock')
+  call ExpectBlock("@import 'vendor'", 'style', 'stylus', 'cssStylusStyleBlock')
+  call ExpectBlock('"requiresAuth"', 'route', 'json', 'jsonRouteBlock')
+  call ExpectBlock('# This is', 'docs', 'markdown', 'markdownDocsBlock')
+  call ExpectBlock('en:', 'i18n', 'yaml', 'yamlI18nBlock')
+  call ExpectBlock('"en"', 'i18n', 'json', 'jsonI18nBlock')
+
+  " Syntax from a sync point, as after jumping to the end
+  silent edit!
+  normal! G
+  call search('"en"', 'bW')
+  call ExpectEqual(GetVueSyntax(), 'json', 'syntax at the end after reload')
+endfunction