update elements and fix some bugs

lib/src/prism/tests/languages/smarty/string_feature.test

Index: lib/src/prism/tests/languages/smarty/string_feature.test
diff --git a/lib/src/prism/tests/languages/smarty/string_feature.test b/lib/src/prism/tests/languages/smarty/string_feature.test
new file mode 100644
index 0000000000000000000000000000000000000000..31f6e79576b7fc9aad1fd4ad4043e7589185178b
--- /dev/null
+++ b/lib/src/prism/tests/languages/smarty/string_feature.test
@@ -0,0 +1,33 @@
+{""}
+{"fo\"obar"}
+{''}
+{'fo\'obar'}
+
+----------------------------------------------------
+
+[
+	["smarty", [
+		["delimiter", "{"],
+		["string", "\"\""],
+		["delimiter", "}"]
+	]],
+	["smarty", [
+		["delimiter", "{"],
+		["string", "\"fo\\\"obar\""],
+		["delimiter", "}"]
+	]],
+	["smarty", [
+		["delimiter", "{"],
+		["string", "''"],
+		["delimiter", "}"]
+	]],
+	["smarty", [
+		["delimiter", "{"],
+		["string", "'fo\\'obar'"],
+		["delimiter", "}"]
+	]]
+]
+
+----------------------------------------------------
+
+Checks for strings.