Fix output file truncation bug

Remove incorrect code that stripped the last 2 bytes from the output file.
The original comment said 'Strip double line break' but this was actually
removing the final '>' character and newline from the closing tag.

Changes:
- Fixed Main.java to write complete file content
- Added try-with-resources for FileOutputStream to fix resource leak
- Added integration test with closing_tag_input.xml and closing_tag_expected.xml

Author: mdzyuba

src/main/java/com/bytehamster/androidxmlformatter/Main.java

@@ -69,8 +69,9 @@ public static void main(String[] args) throws Exception {
             ByteArrayOutputStream stream = new ByteArrayOutputStream();
             outputter.output(doc, stream);
             byte[] content = stream.toByteArray();
-            new FileOutputStream(filename)
-                    .write(content, 0, content.length - 2); // Strip double line break
+            try (FileOutputStream fos = new FileOutputStream(filename)) {
+                fos.write(content, 0, content.length);
+            }
         }
     }
 }

src/test/java/com/bytehamster/androidxmlformatter/IntegrationTest.java

@@ -194,6 +194,22 @@ void testNamespaceSort() throws Exception {
         );
     }
 
+    // === Closing Tag Preservation Test ===
+
+    @Test
+    @DisplayName("Closing tag: verify closing tag is not truncated")
+    void testClosingTagNotTruncated() throws Exception {
+        assertFormattedOutputMatches(
+                "closing_tag",
+                4, // indention
+                4, // attribute indention
+                new String[] { "android" }, // namespace order
+                new String[] { "id", "layout_width", "layout_height" }, // attribute order
+                false, // attribute sort
+                false // namespace sort
+        );
+    }
+
     // === Combined Options Test ===
 
     @Test

src/test/resources/integration/closing_tag_expected.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <Button
+        android:id="@+id/button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+
+</LinearLayout>

src/test/resources/integration/closing_tag_input.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_height="match_parent"
+    android:layout_width="match_parent">
+
+    <Button
+        android:id="@+id/button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+
+</LinearLayout>