TriggerOnOffenceExample.java

package example;

import app.zoftwhere.bolt.Runner;
import java.io.PrintStream;

/**
 * This example shows how to handle failures or errors with the asserter consumer.
 *
 * <p>The program triggers an offence as the word "world" is expected to be with an upper case 'W'
 *
 * @author Osmund
 * @version 11.6.0
 * @since 5.0.0
 */
public class TriggerOnOffenceExample {

  public static void main(String[] args) {
    run(System.err);
  }

  static void run(PrintStream err) {
    Runner.newRunner()
        .run(
            (scanner, out) -> {
              out.println("test:");
              out.print("Hello world!");
            })
        .input()
        .expected("test:", "Hello World!")
        .onOffence(
            result -> {
              // Check if error (throwable/exception was thrown)
              if (result.error().isPresent()) {
                throw result.error().get();
              }

              // If offending index is -1, then it must be the output lengths.
              if (result.offendingIndex() == -1) {
                err.println("Program output does not meet expectation.");
                err.printf("Program outputted %d lines.%n", result.output().length);
                err.printf("Expected outputted is %d lines.%n", result.expected().length);
                return;
              }

              // Otherwise it must be a comparison flag.
              int index = result.offendingIndex();
              err.println("Program output does not meet expectation.");
              err.printf("Output line number: %d%n", index + 1);
              err.printf("Program output: %s%n", result.output()[index]);
              err.printf("Expected output: %s%n", result.expected()[index]);
            });
  }
}