Add Java 19 test class ... (#19)

- Virtual Threads
- Pattern Matching for Switch

Author: mperor

README.md

@@ -30,5 +30,6 @@ This project includes unit tests for key functionalities introduced in each Java
 - [Java 16](src/test/java/pl/mperor/lab/java/Java16.java)
 - [Java 17](src/test/java/pl/mperor/lab/java/Java17.java)
 - [Java 18](src/test/java/pl/mperor/lab/java/Java18.java)
+- [Java 19](src/test/java/pl/mperor/lab/java/Java19.java)
 
 For detailed examples and tests of each feature, please refer to the individual source files linked above.

src/test/java/pl/mperor/lab/java/Java19.java

@@ -0,0 +1,40 @@
+package pl.mperor.lab.java;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import pl.mperor.lab.TestUtils;
+import pl.mperor.lab.TestUtils.ReadableOut;
+
+/**
+ * Java 19 (September 2022)
+ */
+public class Java19 {
+
+    @Test
+    public void testRecordPatternDeconstruct() {
+        record Point(int x, int y) {}
+        record LineSegment(Point start, Point end) {}
+        Object obj = new LineSegment(new Point(0,1), new Point(1, 2));
+
+        if(obj instanceof LineSegment(Point(int x, int y), Point end)) {
+            Assertions.assertEquals(0, x);
+            Assertions.assertEquals(1, y);
+            Assertions.assertEquals(new Point (1,2), end);
+        }
+    }
+
+    @Test
+    public void testVirtualThreads() throws InterruptedException {
+        ReadableOut out = TestUtils.setTempSystemOut();
+        Thread virtualThread = Thread.startVirtualThread(() ->
+                System.out.print("Hello from Virtual Thread!")
+        );
+        virtualThread.join();
+        TestUtils.resetSystemOut();
+
+        Assertions.assertTrue(virtualThread.isDaemon() && virtualThread.isVirtual());
+        Assertions.assertEquals(Thread.NORM_PRIORITY, virtualThread.getPriority());
+        Assertions.assertEquals("Hello from Virtual Thread!", out.all());
+    }
+
+}