--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/utilities/UnionAssumptionTest.java	Fri Dec 13 15:53:30 2013 +0000
@@ -0,0 +1,119 @@
+/*
+ * 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.
+ */
+package com.oracle.truffle.api.test.utilities;
+
+import static org.junit.Assert.*;
+
+import org.junit.*;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.nodes.*;
+import com.oracle.truffle.api.utilities.*;
+
+public class UnionAssumptionTest {
+
+    @Test
+    public void testIsValid() {
+        final Assumption first = Truffle.getRuntime().createAssumption("first");
+        final Assumption second = Truffle.getRuntime().createAssumption("second");
+        final UnionAssumption union = new UnionAssumption(first, second);
+        assertTrue(union.isValid());
+    }
+
+    @Test
+    public void testCheck() throws InvalidAssumptionException {
+        final Assumption first = Truffle.getRuntime().createAssumption("first");
+        final Assumption second = Truffle.getRuntime().createAssumption("second");
+        final UnionAssumption union = new UnionAssumption(first, second);
+        union.check();
+    }
+
+    @Test
+    public void testFirstInvalidateIsValid() {
+        final Assumption first = Truffle.getRuntime().createAssumption("first");
+        final Assumption second = Truffle.getRuntime().createAssumption("second");
+        final UnionAssumption union = new UnionAssumption(first, second);
+
+        first.invalidate();
+
+        assertFalse(union.isValid());
+    }
+
+    @Test(expected = InvalidAssumptionException.class)
+    public void testFirstInvalidateCheck() throws InvalidAssumptionException {
+        final Assumption first = Truffle.getRuntime().createAssumption("first");
+        final Assumption second = Truffle.getRuntime().createAssumption("second");
+        final UnionAssumption union = new UnionAssumption(first, second);
+
+        first.invalidate();
+
+        union.check();
+    }
+
+    @Test
+    public void testSecondInvalidateIsValid() {
+        final Assumption first = Truffle.getRuntime().createAssumption("first");
+        final Assumption second = Truffle.getRuntime().createAssumption("second");
+        final UnionAssumption union = new UnionAssumption(first, second);
+
+        second.invalidate();
+
+        assertFalse(union.isValid());
+    }
+
+    @Test(expected = InvalidAssumptionException.class)
+    public void testSecondInvalidateCheck() throws InvalidAssumptionException {
+        final Assumption first = Truffle.getRuntime().createAssumption("first");
+        final Assumption second = Truffle.getRuntime().createAssumption("second");
+        final UnionAssumption union = new UnionAssumption(first, second);
+
+        second.invalidate();
+
+        union.check();
+    }
+
+    @Test
+    public void testBothInvalidateIsValid() {
+        final Assumption first = Truffle.getRuntime().createAssumption("first");
+        final Assumption second = Truffle.getRuntime().createAssumption("second");
+        final UnionAssumption union = new UnionAssumption(first, second);
+
+        first.invalidate();
+        second.invalidate();
+
+        assertFalse(union.isValid());
+    }
+
+    @Test(expected = InvalidAssumptionException.class)
+    public void testBothInvalidateCheck() throws InvalidAssumptionException {
+        final Assumption first = Truffle.getRuntime().createAssumption("first");
+        final Assumption second = Truffle.getRuntime().createAssumption("second");
+        final UnionAssumption union = new UnionAssumption(first, second);
+
+        first.invalidate();
+        second.invalidate();
+
+        union.check();
+    }
+
+}