diff --git a/src/io/nayuki/fastqrcodegen/QrCodeGeneratorWorker.java b/src/io/nayuki/fastqrcodegen/QrCodeGeneratorWorker.java
new file mode 100644
index 0000000..cd04eb5
--- /dev/null
+++ b/src/io/nayuki/fastqrcodegen/QrCodeGeneratorWorker.java
@@ -0,0 +1,103 @@
+/* 
+ * QR Code generator test worker
+ * 
+ * This program reads data and encoding parameters from standard input and writes
+ * QR Code bitmaps to standard output. The I/O format is one integer per line.
+ * Run with no command line arguments. The program is intended for automated
+ * batch testing of end-to-end functionality of this QR Code generator library.
+ * 
+ * Copyright (c) Project Nayuki. (MIT License)
+ * https://www.nayuki.io/
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ * - The above copyright notice and this permission notice shall be included in
+ *   all copies or substantial portions of the Software.
+ * - The Software is provided "as is", without warranty of any kind, express or
+ *   implied, including but not limited to the warranties of merchantability,
+ *   fitness for a particular purpose and noninfringement. In no event shall the
+ *   authors or copyright holders be liable for any claim, damages or other
+ *   liability, whether in an action of contract, tort or otherwise, arising from,
+ *   out of or in connection with the Software or the use or other dealings in the
+ *   Software.
+ */
+
+package io.nayuki.fastqrcodegen;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Scanner;
+
+
+public final class QrCodeGeneratorWorker {
+	
+	public static void main(String[] args) {
+		// Set up input stream and start loop
+		try (Scanner input = new Scanner(System.in, "US-ASCII")) {
+			input.useDelimiter("\r\n|\n|\r");
+			while (processCase(input));
+		}
+	}
+	
+	
+	private static boolean processCase(Scanner input) {
+		// Read data length or exit
+		int length = input.nextInt();
+		if (length == -1)
+			return false;
+		if (length > Short.MAX_VALUE)
+			throw new RuntimeException();
+		
+		// Read data bytes
+		boolean isAscii = true;
+		byte[] data = new byte[length];
+		for (int i = 0; i < data.length; i++) {
+			int b = input.nextInt();
+			if (b < 0 || b > 255)
+				throw new RuntimeException();
+			data[i] = (byte)b;
+			isAscii &= b < 128;
+		}
+		
+		// Read encoding parameters
+		int errCorLvl  = input.nextInt();
+		int minVersion = input.nextInt();
+		int maxVersion = input.nextInt();
+		int mask       = input.nextInt();
+		int boostEcl   = input.nextInt();
+		if (!(0 <= errCorLvl && errCorLvl <= 3) || !(-1 <= mask && mask <= 7) || (boostEcl >>> 1) != 0
+				|| !(QrCode.MIN_VERSION <= minVersion && minVersion <= maxVersion && maxVersion <= QrCode.MAX_VERSION))
+			throw new RuntimeException();
+		
+		// Make segments for encoding
+		List<QrSegment> segs;
+		if (isAscii)
+			segs = QrSegment.makeSegments(new String(data, StandardCharsets.US_ASCII));
+		else
+			segs = Arrays.asList(QrSegment.makeBytes(data));
+		
+		
+		try {  // Try to make QR Code symbol
+			QrCode qr = QrCode.encodeSegments(segs, QrCode.Ecc.values()[errCorLvl], minVersion, maxVersion, mask, boostEcl != 0);
+			// Print grid of modules
+			System.out.println(qr.version);
+			for (int y = 0; y < qr.size; y++) {
+				for (int x = 0; x < qr.size; x++)
+					System.out.println(qr.getModule(x, y) ? 1 : 0);
+			}
+			
+		} catch (IllegalArgumentException e) {
+			if (!e.getMessage().equals("Data too long"))
+				throw e;
+			System.out.println(-1);
+		}
+		System.out.flush();
+		return true;
+	}
+	
+}