8024500: Missing API coverage for java.util.function.BiFunction andThen

Reviewed-by: mduigou, alanb

test/java/util/Collections/SingletonIterator.java

+/*
+ * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @run testng SingletonIterator
+ */
+
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+import java.util.concurrent.atomic.AtomicInteger;
+import org.testng.annotations.Test;
+
+import static org.testng.Assert.assertEquals;
+import static org.testng.Assert.assertFalse;
+import static org.testng.Assert.fail;
+
+@Test(groups = "unit")
+public class SingletonIterator {
+    public void testForEachRemaining() {
+        Iterator<String> it = Collections.singleton("TheOne").iterator();
+        AtomicInteger cnt = new AtomicInteger(0);
+
+        it.forEachRemaining(s -> {
+            assertEquals("TheOne", s);
+            cnt.incrementAndGet();
+        });
+
+        assertEquals(cnt.get(), 1);
+        assertFalse(it.hasNext());
+
+        try {
+            String str = it.next();
+            fail("Should throw NoSuchElementException at end");
+        } catch (NoSuchElementException ex) {
+            // ignore;
+        }
+    }
+}

test/java/util/function/BiFunction/BiFunctionTest.java

+/*
+ * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8024500
+ * @run testng BiFunctionTest
+ */
+
+import java.util.function.BiFunction;
+import java.util.function.Function;
+import org.testng.annotations.Test;
+
+import static org.testng.Assert.assertEquals;
+import static org.testng.Assert.fail;
+
+@Test(groups = "unit")
+public class BiFunctionTest {
+    static class Quote {
+        double unit_price;
+
+        Quote(double price) {
+            unit_price = price;
+        }
+    };
+
+    static class Order {
+        int quantity;
+
+        Order(int quantity) {
+            this.quantity = quantity;
+        }
+    };
+
+    BiFunction<Quote, Order, Double> estimate = (quote, order) -> {
+        if (quote.unit_price < 0) {
+            throw new IllegalArgumentException("quote");
+        }
+
+        if (order.quantity < 0) {
+            throw new IllegalArgumentException("order");
+        }
+
+        return quote.unit_price * order.quantity;
+    };
+
+    Function<Double, Long> creditcheck = total -> {
+        if (total > 100.00) {
+            throw new RuntimeException("overlimit");
+        }
+        return total.longValue();
+    };
+
+    public void testAndThen() {
+        try {
+            BiFunction<Quote, Order, Long> checkout = estimate.andThen(null);
+            fail("Null argument should throw NPE");
+        } catch (NullPointerException npe) {
+            // ignore
+        }
+
+        BiFunction<Quote, Order, Long> checkout = estimate.andThen(creditcheck);
+        try {
+            checkout.apply(new Quote(20.0), new Order(-1));
+            fail("First function delivers exception");
+        } catch (IllegalArgumentException e) {
+            assertEquals(e.getMessage(), "order");
+        }
+
+        try {
+            checkout.apply(new Quote(20.0), new Order(10));
+            fail("Second function delivers exception");
+        } catch (RuntimeException e) {
+            assertEquals(e.getMessage(), "overlimit");
+        }
+
+        assertEquals(49, checkout.apply(new Quote(24.99), new Order(2)).longValue());
+        assertEquals(50, checkout.apply(new Quote(25), new Order(2)).longValue());
+    }
+}