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diff --git a/component/src/test/java/com/yahoo/component/VersionSpecificationTestCase.java b/component/src/test/java/com/yahoo/component/VersionSpecificationTestCase.java
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+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.component;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * @author bratseth
+ */
+public class VersionSpecificationTestCase {
+
+    @Test
+    public void testPrimitiveCreation() {
+        VersionSpecification version=new VersionSpecification(1,2,3,"qualifier");
+        assertEquals(1, (int)version.getSpecifiedMajor());
+        assertEquals(2, (int)version.getSpecifiedMinor());
+        assertEquals(3, (int)version.getSpecifiedMicro());
+        assertEquals("qualifier",version.getSpecifiedQualifier());
+        assertEquals(1, version.getMajor());
+        assertEquals(2, version.getMinor());
+        assertEquals(3, version.getMicro());
+        assertEquals("qualifier",version.getQualifier());
+    }
+
+    @Test
+    public void testUnderspecifiedPrimitiveCreation() {
+        VersionSpecification version=new VersionSpecification(1);
+        assertEquals(1,(int)version.getSpecifiedMajor());
+        assertEquals(null,version.getSpecifiedMinor());
+        assertEquals(null,version.getSpecifiedMicro());
+        assertEquals(null,version.getSpecifiedQualifier());
+        assertEquals(1, version.getMajor());
+        assertEquals(0, version.getMinor());
+        assertEquals(0, version.getMicro());
+        assertEquals("",version.getQualifier());
+    }
+
+    @Test
+    public void testStringCreation() {
+        VersionSpecification version=new VersionSpecification("1.2.3.qualifier");
+        assertEquals(1,(int)version.getSpecifiedMajor());
+        assertEquals(2,(int)version.getSpecifiedMinor());
+        assertEquals(3,(int)version.getSpecifiedMicro());
+        assertEquals("qualifier",version.getSpecifiedQualifier());
+    }
+
+    @Test
+    public void testUnderspecifiedStringCreation() {
+        VersionSpecification version=new VersionSpecification("1");
+        assertEquals(1,(int)version.getSpecifiedMajor());
+        assertEquals(null,version.getSpecifiedMinor());
+        assertEquals(null,version.getSpecifiedMicro());
+        assertEquals(null,version.getSpecifiedQualifier());
+        assertEquals(1, version.getMajor());
+        assertEquals(0, version.getMinor());
+        assertEquals(0, version.getMicro());
+        assertEquals("",version.getQualifier());
+    }
+
+    @Test
+    public void testEquality() {
+        assertEquals(new VersionSpecification(),VersionSpecification.emptyVersionSpecification);
+        assertEquals(new VersionSpecification(),new VersionSpecification(""));
+        assertEquals(new VersionSpecification(1),new VersionSpecification("1"));
+        assertEquals(new VersionSpecification(1,2),new VersionSpecification("1.2"));
+        assertEquals(new VersionSpecification(1,2,3),new VersionSpecification("1.2.3"));
+        assertEquals(new VersionSpecification(1,2,3,"qualifier"),new VersionSpecification("1.2.3.qualifier"));
+    }
+
+    @Test
+    public void testToString() {
+        assertEquals("",new VersionSpecification().toString());
+        assertEquals("1",new VersionSpecification(1).toString());
+        assertEquals("1.2",new VersionSpecification(1,2).toString());
+        assertEquals("1.2.3",new VersionSpecification(1,2,3).toString());
+        assertEquals("1.2.3.qualifier",new VersionSpecification(1,2,3,"qualifier").toString());
+    }
+
+    @Test
+    public void testMatches() {
+        assertTrue(new VersionSpecification("").matches(new Version("1")));
+        assertTrue(new VersionSpecification("1").matches(new Version("1")));
+        assertFalse(new VersionSpecification("1").matches(new Version("2")));
+        assertTrue(new VersionSpecification("").matches(new Version("1.2.3")));
+        assertFalse(new VersionSpecification("").matches(new Version("1.2.3.qualifier"))); // qualifier requires exact match
+
+        assertTrue(new VersionSpecification("1.2").matches(new Version("1.2")));
+        assertTrue(new VersionSpecification("1").matches(new Version("1.2")));
+        assertFalse(new VersionSpecification("1.2").matches(new Version("1.3")));
+        assertFalse(new VersionSpecification("1.2").matches(new Version("2")));
+
+        assertTrue(new VersionSpecification("1.2.3").matches(new Version("1.2.3")));
+        assertTrue(new VersionSpecification("1.2").matches(new Version("1.2.3")));
+        assertTrue(new VersionSpecification("1").matches(new Version("1.2.3")));
+        assertFalse(new VersionSpecification("1.2.3").matches(new Version("1.2.4")));
+        assertFalse(new VersionSpecification("1.3").matches(new Version("1.2.3")));
+        assertFalse(new VersionSpecification("2").matches(new Version("1.2.3")));
+
+        assertTrue(new VersionSpecification("1.2.3.qualifier").matches(new Version("1.2.3.qualifier")));
+        assertFalse(new VersionSpecification("1.2.3.qualifier1").matches(new Version("1.2.3.qualifier2")));
+        assertFalse(new VersionSpecification("1.2.3.qualifier").matches(new Version("1.2.3")));
+        assertFalse(new VersionSpecification("1.2.3.qualifier").matches(new Version("1.2")));
+        assertFalse(new VersionSpecification("1.2.3.qualifier").matches(new Version("1")));
+        assertFalse(new VersionSpecification("1.2.3.qualifier").matches(new Version("")));
+
+        assertFalse(new VersionSpecification(1, null, null, null).matches(new Version("1.2.3.qualifier")));
+        assertFalse(new VersionSpecification(1, 2, 0, "qualifier").matches(new Version("1.2.3.qualifier")));
+        assertFalse(new VersionSpecification(1, 2, 3).matches(new Version("1.2.3.qualifier")));
+    }
+
+    @Test
+    public void testOrder() {
+        assertTrue(new VersionSpecification("1.2.3").compareTo(new VersionSpecification("1.2.3"))==0);
+        assertTrue(new VersionSpecification("1.2.3").compareTo(new VersionSpecification("1.2.4"))<0);
+        assertTrue(new VersionSpecification("1.2.3").compareTo(new VersionSpecification("1.2.2"))>0);
+
+        assertTrue(new VersionSpecification("1.2.3").compareTo(new VersionSpecification("2"))<0);
+        assertTrue(new VersionSpecification("1.2.3").compareTo(new VersionSpecification("1.3"))<0);
+
+        assertTrue(new VersionSpecification("1.0.0").compareTo(new VersionSpecification("1"))==0);
+    }
+
+    @Test
+    public void testValidIntersect() {
+        VersionSpecification mostSpecific = new VersionSpecification(4, 2, 1);
+        VersionSpecification leastSpecific = new VersionSpecification(4, 2);
+
+        assertEquals(mostSpecific,
+                mostSpecific.intersect(leastSpecific));
+        assertEquals(mostSpecific,
+                leastSpecific.intersect(mostSpecific));
+    }
+
+    @Test(expected=RuntimeException.class)
+    public void testInvalidIntersect() {
+        new VersionSpecification(4, 1).intersect(
+                new VersionSpecification(4, 2));
+    }
+}