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package com.oracle.truffle.llvm.test.alpha;

import static org.junit.Assert.assertEquals;
import org.junit.Test;
import com.oracle.truffle.llvm.pipe.CaptureOutput;
import java.io.IOException;

public class CaptureOutputTest {

    @Test
    public void testOutputCapturing() throws IOException {
        String string = "Testoutput";
        String captured;
        try (CaptureOutput out = new CaptureOutput()) {
            System.out.print(string);
            captured = out.getResult();
        }
        System.out.println("MUST NOT BE IN CAPTURE");
        assertEquals(string, captured);
    }

    @Test
    public void testOutputCapturing2() throws IOException {
        String string = "Does it work again?";
        String captured;
        try (CaptureOutput out = new CaptureOutput()) {
            System.out.print(string);
            captured = out.getResult();
        }
        System.out.println("MUST NOT BE IN CAPTURE");
        assertEquals(string, captured);
    }

    @Test
    public void testNothingHappens() throws IOException {
        for (int i = 0; i < 3; i++) {
            try (CaptureOutput out = new CaptureOutput()) {
                // do nothing
            }
        }
    }

    @Test
    public void testBigOutput() throws IOException {
        StringBuilder result = new StringBuilder();
        String capture;
        try (CaptureOutput out = new CaptureOutput()) {
            for (int i = 0; i < 9000; i++) {
                String line = String.format("line %04d\n", i);
                System.out.print(line);
                result.append(line);
            }
            capture = out.getResult();
        }

        assertEquals(result.toString(), capture);
    }
}