--- /dev/null	2018-12-17 06:09:15.256999270 +0100
+++ new/test/jdk/java/util/HashMap/WhiteBoxResizeTest.java	2018-12-17 07:25:16.508960309 +0100
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
+ *
+ * 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.
+ */
+
+import org.testng.annotations.Test;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+import java.lang.invoke.VarHandle;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.stream.IntStream;
+
+import static java.util.stream.Collectors.toMap;
+import static org.testng.Assert.assertEquals;
+
+/*
+ * @test
+ * @bug 8210280
+ * @modules java.base/java.util:open
+ * @summary White box tests for HashMap internals around table resize
+ * @run testng WhiteBoxResizeTest
+ */
+public class WhiteBoxResizeTest {
+    final MethodHandle TABLE_SIZE_FOR;
+    final VarHandle THRESHOLD;
+    final VarHandle TABLE;
+
+    public WhiteBoxResizeTest() throws ReflectiveOperationException {
+        Class<?> mClass = HashMap.class;
+        String nodeClassName = mClass.getName() + "$Node";
+        Class<?> nodeArrayClass = Class.forName("[L" + nodeClassName + ";");
+        MethodHandles.Lookup lookup = MethodHandles.privateLookupIn(mClass, MethodHandles.lookup());
+        TABLE = lookup.findVarHandle(mClass, "table", nodeArrayClass);
+        this.TABLE_SIZE_FOR = lookup.findStatic(
+                mClass, "tableSizeFor",
+                MethodType.methodType(int.class, int.class));
+        this.THRESHOLD = lookup.findVarHandle(mClass, "threshold", int.class);
+    }
+
+    int tableSizeFor(int n) {
+        try {
+            return (int) TABLE_SIZE_FOR.invoke(n);
+        } catch (Throwable t) { throw new AssertionError(t); }
+    }
+
+    @Test
+    public void testTableSizeFor() {
+        assertEquals(tableSizeFor(0), 1);
+        assertEquals(tableSizeFor(1), 1);
+        assertEquals(tableSizeFor(2), 2);
+        assertEquals(tableSizeFor(3), 4);
+        assertEquals(tableSizeFor(15), 16);
+        assertEquals(tableSizeFor(16), 16);
+        assertEquals(tableSizeFor(17), 32);
+        int maxSize = 1 << 30;
+        assertEquals(tableSizeFor(maxSize - 1), maxSize);
+        assertEquals(tableSizeFor(maxSize), maxSize);
+        assertEquals(tableSizeFor(maxSize + 1), maxSize);
+        assertEquals(tableSizeFor(Integer.MAX_VALUE), maxSize);
+    }
+
+    @Test
+    public void putAllCapacityTest() {
+        var map = new HashMap<Integer, Integer>();
+        map.put(1, 1);
+        map.putAll(IntStream.range(0, 64).boxed().collect(toMap(i -> i, i -> i)));
+
+        int capacity = ((Object[]) TABLE.get(map)).length;
+        assertEquals(capacity, 128);
+    }
+}