--- /dev/null	2018-07-05 11:42:45.438466534 -0700
+++ new/test/jdk/java/awt/Color/AlphaColorTest.java	2018-07-26 12:33:11.856524258 -0700
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2018, 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
+ * @key headful
+ * @bug 8204931
+ * @summary test alpha colors are blended with background.
+ */
+
+import java.awt.Color;
+import java.awt.Component;
+import java.awt.Dimension;
+import java.awt.Frame;
+import java.awt.Graphics;
+import java.awt.Robot;
+import javax.swing.SwingUtilities;
+
+public class AlphaColorTest extends Component {
+
+    private Color color;
+
+    public AlphaColorTest(Color c) {
+       this.color = c;
+    }
+
+    public void paint(Graphics g) {
+        g.setColor(color);
+        g.fillRect(0, 0, getSize().width, getSize().height);
+    }
+
+    public Dimension getPreferredSize() {
+        return getSize();
+    }
+
+    public Dimension getSize() {
+        return new Dimension(200, 200);
+    }
+
+    public static void main(String args[]) throws Exception {
+        SwingUtilities.invokeAndWait(() -> createAndShowGUI());
+        Robot robot = new Robot();
+        robot.delay(5000);
+        robot.waitForIdle();
+        Color c = robot.getPixelColor(frame.getX() + 100, frame.getY() + 100);
+        int red = c.getRed();
+        frame.dispose();
+        // Should be 126-128, but be tolerant of gamma correction.
+        if (red < 122 || red > 132) {
+            throw new RuntimeException("Color is not as expected. Got " + c);
+        }
+     }
+
+    static Frame frame;
+    private static void createAndShowGUI() {
+        frame = new Frame("Alpha Color Test");
+        frame.setBackground(Color.black);
+        Color color = new Color(255, 255, 255, 127);
+        frame.add("Center", new AlphaColorTest(color));
+        frame.pack();
+        frame.setVisible(true);
+    }
+}