BAEL-13505 Move articles out of core java - part 2

core-java-modules/core-java-os/src/main/java/com/baeldung/printscreen/Screenshot.java

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+package com.baeldung.printscreen;
+
+import javax.imageio.ImageIO;
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.io.File;
+
+public class Screenshot {
+
+    private final String path;
+
+    public Screenshot(String path) {
+        this.path = path;
+    }
+
+    public void getScreenshot(int timeToWait) throws Exception {
+        Rectangle rectangle = new Rectangle(Toolkit.getDefaultToolkit()
+            .getScreenSize());
+        Robot robot = new Robot();
+        BufferedImage img = robot.createScreenCapture(rectangle);
+        ImageIO.write(img, "jpg", new File(path));
+    }
+}

core-java-modules/core-java-os/src/main/java/com/baeldung/system/DetectOS.java

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+package com.baeldung.system;
+
+import org.apache.commons.lang3.SystemUtils;
+
+public class DetectOS {
+
+    public String getOperatingSystem() {
+        String os = System.getProperty("os.name");
+        System.out.println("Using System Property: " + os);
+        return os;
+    }
+
+    public String getOperatingSystemSystemUtils() {
+        String os = SystemUtils.OS_NAME;
+        System.out.println("Using SystemUtils: " + os);
+        return os;
+    }
+}

core-java-modules/core-java-os/src/test/java/com/baeldung/grep/GrepWithUnix4JIntegrationTest.java

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+package com.baeldung.grep;
+
+import java.io.File;
+import java.util.List;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.unix4j.Unix4j;
+import static org.unix4j.Unix4j.*;
+import static org.junit.Assert.assertEquals;
+import org.unix4j.line.Line;
+import static org.unix4j.unix.Grep.*;
+import static org.unix4j.unix.cut.CutOption.*;
+
+public class GrepWithUnix4JIntegrationTest {
+
+    private File fileToGrep;
+
+    @Before
+    public void init() {
+        final String separator = File.separator;
+        final String filePath = String.join(separator, new String[] { "src", "test", "resources", "dictionary.in" });
+        fileToGrep = new File(filePath);
+    }
+
+    @Test
+    public void whenGrepWithSimpleString_thenCorrect() {
+        int expectedLineCount = 4;
+
+        // grep "NINETEEN" dictionary.txt
+        List<Line> lines = Unix4j.grep("NINETEEN", fileToGrep).toLineList();
+
+        assertEquals(expectedLineCount, lines.size());
+    }
+
+    @Test
+    public void whenInverseGrepWithSimpleString_thenCorrect() {
+        int expectedLineCount = 178687;
+
+        // grep -v "NINETEEN" dictionary.txt
+        List<Line> lines = grep(Options.v, "NINETEEN", fileToGrep).toLineList();
+
+        assertEquals(expectedLineCount, lines.size());
+    }
+
+    @Test
+    public void whenGrepWithRegex_thenCorrect() {
+        int expectedLineCount = 151;
+
+        // grep -c ".*?NINE.*?" dictionary.txt
+        String patternCount = grep(Options.c, ".*?NINE.*?", fileToGrep).cut(fields, ":", 1).toStringResult();
+
+        assertEquals(expectedLineCount, Integer.parseInt(patternCount));
+    }
+}

core-java-modules/core-java-os/src/test/java/com/baeldung/printscreen/ScreenshotLiveTest.java

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+package com.baeldung.printscreen;
+
+import org.junit.After;
+import org.junit.Test;
+
+import java.io.File;
+
+import static org.junit.Assert.assertTrue;
+
+public class ScreenshotLiveTest {
+
+    private Screenshot screenshot = new Screenshot("Screenshot.jpg");
+    private File file = new File("Screenshot.jpg");
+
+    @Test
+    public void testGetScreenshot() throws Exception {
+        screenshot.getScreenshot(2000);
+        assertTrue(file.exists());
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        file.delete();
+    }
+}

core-java-modules/core-java-os/src/test/java/com/baeldung/shell/JavaProcessUnitIntegrationTest.java

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+package com.baeldung.java.shell;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.*;
+import java.util.concurrent.Executors;
+import java.util.function.Consumer;
+
+public class JavaProcessUnitIntegrationTest {
+    private static final boolean IS_WINDOWS = System.getProperty("os.name").toLowerCase().startsWith("windows");
+
+    private static class StreamGobbler implements Runnable {
+        private InputStream inputStream;
+        private Consumer<String> consumer;
+
+        public StreamGobbler(InputStream inputStream, Consumer<String> consumer) {
+            this.inputStream = inputStream;
+            this.consumer = consumer;
+        }
+
+        @Override
+        public void run() {
+            new BufferedReader(new InputStreamReader(inputStream)).lines().forEach(consumer);
+        }
+    }
+
+    private Consumer<String> consumer = Assert::assertNotNull;
+
+    private String homeDirectory = System.getProperty("user.home");
+
+    @Test
+    public void givenProcess_whenCreatingViaRuntime_shouldSucceed() throws Exception {
+        Process process;
+        if (IS_WINDOWS) {
+            process = Runtime.getRuntime().exec(String.format("cmd.exe /c dir %s", homeDirectory));
+        } else {
+            process = Runtime.getRuntime().exec(String.format("sh -c ls %s", homeDirectory));
+        }
+        StreamGobbler streamGobbler = new StreamGobbler(process.getInputStream(), consumer);
+        Executors.newSingleThreadExecutor().submit(streamGobbler);
+        int exitCode = process.waitFor();
+        Assert.assertEquals(0, exitCode);
+    }
+
+    @Test
+    public void givenProcess_whenCreatingViaProcessBuilder_shouldSucceed() throws Exception {
+        ProcessBuilder builder = new ProcessBuilder();
+        if (IS_WINDOWS) {
+            builder.command("cmd.exe", "/c", "dir");
+        } else {
+            builder.command("sh", "-c", "ls");
+        }
+        builder.directory(new File(homeDirectory));
+        Process process = builder.start();
+        StreamGobbler streamGobbler = new StreamGobbler(process.getInputStream(), consumer);
+        Executors.newSingleThreadExecutor().submit(streamGobbler);
+        int exitCode = process.waitFor();
+        Assert.assertEquals(0, exitCode);
+    }
+}

core-java-modules/core-java-os/src/test/java/com/baeldung/system/WhenDetectingOSUnitTest.java

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+package com.baeldung.system;
+
+import org.junit.Assert;
+import org.junit.Ignore;
+import org.junit.Test;
+
+@Ignore
+public class WhenDetectingOSUnitTest {
+
+    private DetectOS os = new DetectOS();
+
+    @Test
+    public void whenUsingSystemProperty_shouldReturnOS() {
+        String expected = "Windows 10";
+        String actual = os.getOperatingSystem();
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void whenUsingSystemUtils_shouldReturnOS() {
+        String expected = "Windows 10";
+        String actual = os.getOperatingSystemSystemUtils();
+        Assert.assertEquals(expected, actual);
+    }
+}