update elements and fix some bugs

lib/src/prism/tests/languages/latex/keyword_feature.test

Index: lib/src/prism/tests/languages/latex/keyword_feature.test
diff --git a/lib/src/prism/tests/languages/latex/keyword_feature.test b/lib/src/prism/tests/languages/latex/keyword_feature.test
new file mode 100644
index 0000000000000000000000000000000000000000..7a1b86f9defcb9b21947a8f81495558f5566fde1
--- /dev/null
+++ b/lib/src/prism/tests/languages/latex/keyword_feature.test
@@ -0,0 +1,32 @@
+\begin{foobar}
+\end{foobar}
+\ref{foobar}
+\cite{foobar}
+\label{foobar}
+\usepackage{foobar}
+\documentclass[11px,twoside,a4paper]{foobar}
+
+----------------------------------------------------
+
+[
+	["function", "\\begin"], ["punctuation", "{"],
+	["keyword", "foobar"], ["punctuation", "}"],
+	["function", "\\end"], ["punctuation", "{"],
+	["keyword", "foobar"], ["punctuation", "}"],
+	["function", "\\ref"], ["punctuation", "{"],
+	["keyword", "foobar"], ["punctuation", "}"],
+	["function", "\\cite"], ["punctuation", "{"],
+	["keyword", "foobar"], ["punctuation", "}"],
+	["function", "\\label"], ["punctuation", "{"],
+	["keyword", "foobar"], ["punctuation", "}"],
+	["function", "\\usepackage"], ["punctuation", "{"],
+	["keyword", "foobar"], ["punctuation", "}"],
+	["function", "\\documentclass"],
+	["punctuation", "["], "11px,twoside,a4paper", ["punctuation", "]"],
+	["punctuation", "{"],
+	["keyword", "foobar"], ["punctuation", "}"]
+]
+
+----------------------------------------------------
+
+Checks for keywords.