2 files changed, 22 insertions, 2 deletions
diff --git a/nuldoc-src/xml.ts b/nuldoc-src/xml.ts
index 13ec5d6..87c2b71 100644
--- a/nuldoc-src/xml.ts
+++ b/nuldoc-src/xml.ts
@@ -2,7 +2,10 @@ import { Element, Node, Text } from "./dom.ts";
 import { XmlParseError } from "./errors.ts";
 
 export async function parseXmlFile(filePath: string): Promise<Element> {
-  const source = await Deno.readTextFile(filePath);
+  return parseXmlString(await Deno.readTextFile(filePath));
+}
+
+export function parseXmlString(source: string): Element {
   return parse({ source: source, index: 0 });
 }
 
@@ -200,7 +203,7 @@ function expect(p: Parser, expected: string) {
   }
   if (actual !== expected) {
     throw new XmlParseError(
-      `[parse.expect] expected ${expected}, but actually got ${actual}`,
+      `[parse.expect] expected ${expected}, but actually got ${actual} (pos: ${p.index})`,
     );
   }
 }
diff --git a/nuldoc-src/xml_test.ts b/nuldoc-src/xml_test.ts
new file mode 100644
index 0000000..28e1597
--- /dev/null
+++ b/nuldoc-src/xml_test.ts
@@ -0,0 +1,17 @@
+import { assertEquals } from "std/testing/asserts.ts";
+import { parseXmlString } from "./xml.ts";
+
+Deno.test("Parse XML", () => {
+  assertEquals(
+    "__root__",
+    parseXmlString(
+      `<?xml version="1.0" encoding="UTF-8"?>
+<hoge>
+  <piyo>
+    <!-- comment -->
+  </piyo>
+</hoge>
+`,
+    ).name,
+  );
+});