Index: trunk/test/unit/org/openstreetmap/josm/actions/AlignInLineActionTest.java
===================================================================
--- trunk/test/unit/org/openstreetmap/josm/actions/AlignInLineActionTest.java	(revision 10343)
+++ trunk/test/unit/org/openstreetmap/josm/actions/AlignInLineActionTest.java	(revision 10347)
@@ -3,4 +3,5 @@
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
 
 import org.junit.BeforeClass;
@@ -8,4 +9,6 @@
 import org.openstreetmap.josm.JOSMFixture;
 import org.openstreetmap.josm.Main;
+import org.openstreetmap.josm.actions.AlignInLineAction.InvalidSelection;
+import org.openstreetmap.josm.actions.AlignInLineAction.Line;
 import org.openstreetmap.josm.data.coor.EastNorth;
 import org.openstreetmap.josm.data.coor.LatLon;
@@ -189,3 +192,37 @@
         assertEquals("Wrong y coordinate.", y, coordinate.getY(), LatLon.MAX_SERVER_PRECISION);
     }
+
+    /**
+     * Test that a {@link Line} can be constructed with nodes of different coordinates.
+     * @throws InvalidSelection never
+     */
+    @Test
+    public void testLineDifferentCoordinates() throws InvalidSelection {
+        assertNotNull(new Line(new Node(new EastNorth(0, 1)),
+                               new Node(new EastNorth(0, 2))));
+        assertNotNull(new Line(new Node(new EastNorth(0, 1)),
+                               new Node(new EastNorth(1, 1))));
+        assertNotNull(new Line(new Node(new EastNorth(0, 1)),
+                               new Node(new EastNorth(0+1e-150, 1+1e-150))));
+    }
+
+    /**
+     * Test that a {@link Line} cannot be constructed with nodes of same coordinates.
+     * @throws InvalidSelection always
+     */
+    @Test(expected = InvalidSelection.class)
+    public void testLineSameCoordinates1() throws InvalidSelection {
+        new Line(new Node(new EastNorth(0, 1)),
+                 new Node(new EastNorth(0, 1)));
+    }
+
+    /**
+     * Test that a {@link Line} cannot be constructed with nodes of same coordinates.
+     * @throws InvalidSelection always
+     */
+    @Test(expected = InvalidSelection.class)
+    public void testLineSameCoordinates2() throws InvalidSelection {
+        new Line(new Node(new EastNorth(0, 1)),
+                 new Node(new EastNorth(0+1e-175, 1+1e-175)));
+    }
 }