Add validation test for JEP 305: Pattern Matching for instanceof (bazel-contrib#999)

Author: Godin

org.jacoco.core.test.validation.java14/src/org/jacoco/core/test/validation/java14/InstanceofTest.java

@@ -0,0 +1,27 @@
+/*******************************************************************************
+ * Copyright (c) 2009, 2020 Mountainminds GmbH & Co. KG and Contributors
+ * This program and the accompanying materials are made available under
+ * the terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *    Evgeny Mandrikov - initial API and implementation
+ *
+ *******************************************************************************/
+package org.jacoco.core.test.validation.java14;
+
+import org.jacoco.core.test.validation.ValidationTestBase;
+import org.jacoco.core.test.validation.java14.targets.InstanceofTarget;
+
+/**
+ * Test of code coverage in {@link InstanceofTarget}.
+ */
+public class InstanceofTest extends ValidationTestBase {
+
+	public InstanceofTest() {
+		super(InstanceofTarget.class);
+	}
+
+}

org.jacoco.core.test.validation.java14/src/org/jacoco/core/test/validation/java14/targets/InstanceofTarget.java

@@ -0,0 +1,34 @@
+/*******************************************************************************
+ * Copyright (c) 2009, 2020 Mountainminds GmbH & Co. KG and Contributors
+ * This program and the accompanying materials are made available under
+ * the terms of the Eclipse Public License 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *    Evgeny Mandrikov - initial API and implementation
+ *
+ *******************************************************************************/
+package org.jacoco.core.test.validation.java14.targets;
+
+import static org.jacoco.core.test.validation.targets.Stubs.nop;
+
+/**
+ * This target exercises pattern matching for instanceof (JEP 305).
+ */
+public class InstanceofTarget {
+
+	private static void ifInstanceof(Object e) {
+		/* See https://bugs.openjdk.java.net/browse/JDK-8237528 */
+		if (e instanceof String s) { // assertFullyCovered(1, 3)
+			nop(s);
+		}
+	}
+
+	public static void main(String[] args) {
+		ifInstanceof(new Object());
+		ifInstanceof("string");
+	}
+
+}