diff --git a/packages/liveui/liveui_tests.js b/packages/liveui/liveui_tests.js
index 1ba76bf8f9..a16ef38ac2 100644
--- a/packages/liveui/liveui_tests.js
+++ b/packages/liveui/liveui_tests.js
@@ -1215,128 +1215,6 @@ Tinytest.add("liveui - basic chunk matching", function(test) {
   test.equal(buf, "off0,off1".split(','));
 });
 
-
-Tinytest.add("liveui - constant chunk", function(test) {
-
-  var R, div;
-
-  // top-level { constant: true }
-
-  R = ReactiveVar(0);
-  var ranges = [];
-  div = OnscreenDiv(Meteor.ui.render(function() {
-    R.get(); // create dependency
-    return '<b/><i/><u/>';
-  }, {
-    constant: true,
-    onscreen: function(start, end, range) {
-      ranges.push(range);
-    }
-  }));
-
-  var nodes = _.toArray(div.node().childNodes);
-  test.equal(nodes.length, 3);
-  Meteor.flush();
-  test.equal(ranges.length, 1);
-  R.set(1);
-  Meteor.flush();
-  test.equal(ranges.length, 2);
-  test.isTrue(ranges[0] === ranges[1]);
-  var nodes2 = _.toArray(div.node().childNodes);
-  test.equal(nodes2.length, 3);
-  test.isTrue(nodes[0] === nodes2[0]);
-  test.isTrue(nodes[1] === nodes2[1]);
-  test.isTrue(nodes[2] === nodes2[2]);
-  div.kill();
-  Meteor.flush();
-  test.equal(R.numListeners(), 0);
-
-  // non-top-level
-
-  // run test with and without branch
-  _.each([null, 'foo'], function(brnch) {
-    // run test with node before or after, or neither or both
-    _.each([false, true], function(nodeBefore) {
-      _.each([false, true], function(nodeAfter) {
-        var hasSpan = true;
-        var isConstant = true;
-
-        R = ReactiveVar('foo');
-        div = OnscreenDiv(Meteor.ui.render(function() {
-          R.get(); // create unconditional dependency
-          return (nodeBefore ? R.get() : '') +
-            Meteor.ui.chunk(function() {
-              return hasSpan ? '<span>stuff</span>' :
-                'blah';
-            }, { branch: brnch, constant: isConstant }) +
-            (nodeAfter ? R.get() : '');
-        }));
-
-        var span = div.node().getElementsByTagName('span')[0];
-        hasSpan = false;
-
-        test.equal(div.text(),
-                   (nodeBefore ? 'foo' : '')+
-                   'stuff'+
-                   (nodeAfter ? 'foo' : ''));
-
-        R.set('bar');
-        Meteor.flush();
-
-        // only absence of branch should cause the constant
-        // chunk to be re-rendered
-        test.equal(div.text(),
-                   (nodeBefore ? 'bar' : '')+
-                   (brnch ? 'stuff' : 'blah')+
-                   (nodeAfter ? 'bar' : ''));
-
-        R.set('baz');
-        Meteor.flush();
-
-        // should be repeatable (liveranges not damaged)
-        test.equal(div.text(),
-                   (nodeBefore ? 'baz' : '')+
-                   (brnch ? 'stuff' : 'blah')+
-                   (nodeAfter ? 'baz' : ''));
-
-        isConstant = false; // no longer constant:true!
-        R.set('qux');
-        Meteor.flush();
-        test.equal(div.text(),
-                   (nodeBefore ? 'qux' : '')+
-                   'blah'+
-                   (nodeAfter ? 'qux' : ''));
-
-        // turn constant back on
-        isConstant = true;
-        hasSpan = true;
-        R.set('popsicle');
-        Meteor.flush();
-        // we don't get the span, instead old "blah" is preserved
-        test.equal(div.text(),
-                   (nodeBefore ? 'popsicle' : '')+
-                   (brnch ? 'blah' : 'stuff')+
-                   (nodeAfter ? 'popsicle' : ''));
-
-        isConstant = false;
-        R.set('hi');
-        Meteor.flush();
-        // now we get the span!
-        test.equal(div.text(),
-                   (nodeBefore ? 'hi' : '')+
-                   'stuff'+
-                   (nodeAfter ? 'hi' : ''));
-
-        div.kill();
-        Meteor.flush();
-      });
-    });
-  });
-
-
-});
-
-
 Tinytest.add("liveui - branch keys", function(test) {
 
   var R, div;
diff --git a/packages/spark/spark.js b/packages/spark/spark.js
index e1a1bd356a..f643b3a9df 100644
--- a/packages/spark/spark.js
+++ b/packages/spark/spark.js
@@ -553,7 +553,7 @@ var computePreservations = function (oldRange, newRange) {
       preservations.push({
         type: "region",
         fromStart: from.firstNode(), fromEnd: from.lastNode(),
-        newRange: newRange
+        newRange: to
       });
 
     _.each(to.preserve, function (nodeLabeler, selector) {
@@ -640,6 +640,7 @@ var notifyLandmarksRendered = function (range) {
         r.createCallback.call(r.state);
         r.created = true;
       }
+      // XXX should be render(start, end) ??
       r.renderCallback.call(r.state);
     }
   });
diff --git a/packages/spark/spark_tests.js b/packages/spark/spark_tests.js
index 1d3c520ebd..0b2a2944c8 100644
--- a/packages/spark/spark_tests.js
+++ b/packages/spark/spark_tests.js
@@ -1185,7 +1185,7 @@ var legacyLabels = {
 };
 
 
-Tinytest.add("spark - preserved nodes (diff/patch)", function(test) {
+Tinytest.add("spark - landmark preserve", function(test) {
 
   var rand;
 
@@ -1336,6 +1336,125 @@ Tinytest.add("spark - preserved nodes (diff/patch)", function(test) {
 
 });
 
+Tinytest.add("spark - landmark constant", function(test) {
 
+  var R, div;
+
+  // top-level { constant: true }
+
+  R = ReactiveVar(0);
+  var states = [];
+  div = OnscreenDiv(Meteor.render(function() {
+    R.get(); // create dependency
+    return Spark.createLandmark({
+      constant: true,
+      render: function() {
+        states.push(this);
+      }
+    }, '<b/><i/><u/>');
+  }));
+
+  var nodes = _.toArray(div.node().childNodes);
+  test.equal(nodes.length, 3);
+  Meteor.flush();
+  test.equal(states.length, 1);
+  R.set(1);
+  Meteor.flush();
+  test.equal(states.length, 2);
+  test.isTrue(states[0] === states[1]);
+  var nodes2 = _.toArray(div.node().childNodes);
+  test.equal(nodes2.length, 3);
+  test.isTrue(nodes[0] === nodes2[0]);
+  test.isTrue(nodes[1] === nodes2[1]);
+  test.isTrue(nodes[2] === nodes2[2]);
+  div.kill();
+  Meteor.flush();
+  test.equal(R.numListeners(), 0);
+
+  // non-top-level
+
+  var i = 1;
+  // run test with and without branch
+  _.each([false, true], function(matchLandmark) {
+    // run test with node before or after, or neither or both
+    _.each([false, true], function(nodeBefore) {
+      _.each([false, true], function(nodeAfter) {
+        var hasSpan = true;
+        var isConstant = true;
+
+        R = ReactiveVar('foo');
+        div = OnscreenDiv(Meteor.render(function() {
+          R.get(); // create unconditional dependency
+          var brnch = matchLandmark ? 'myBranch' : ('branch'+(++i));
+          return (nodeBefore ? R.get() : '') +
+            Spark.labelBranch(
+              brnch,
+              Spark.createLandmark({ constant: isConstant },
+                                   hasSpan ? '<span>stuff</span>' : 'blah')) +
+            (nodeAfter ? R.get() : '');
+        }));
+
+        var span = div.node().getElementsByTagName('span')[0];
+        hasSpan = false;
+
+        test.equal(div.text(),
+                   (nodeBefore ? 'foo' : '')+
+                   'stuff'+
+                   (nodeAfter ? 'foo' : ''));
+
+        R.set('bar');
+        Meteor.flush();
+
+        // only absence of branch should cause the constant
+        // chunk to be re-rendered
+        test.equal(div.text(),
+                   (nodeBefore ? 'bar' : '')+
+                   (matchLandmark ? 'stuff' : 'blah')+
+                   (nodeAfter ? 'bar' : ''));
+
+        R.set('baz');
+        Meteor.flush();
+
+        // should be repeatable (liveranges not damaged)
+        test.equal(div.text(),
+                   (nodeBefore ? 'baz' : '')+
+                   (matchLandmark ? 'stuff' : 'blah')+
+                   (nodeAfter ? 'baz' : ''));
+
+        isConstant = false; // no longer constant:true!
+        R.set('qux');
+        Meteor.flush();
+        test.equal(div.text(),
+                   (nodeBefore ? 'qux' : '')+
+                   'blah'+
+                   (nodeAfter ? 'qux' : ''));
+
+        // turn constant back on
+        isConstant = true;
+        hasSpan = true;
+        R.set('popsicle');
+        Meteor.flush();
+        // we don't get the span, instead old "blah" is preserved
+        test.equal(div.text(),
+                   (nodeBefore ? 'popsicle' : '')+
+                   (matchLandmark ? 'blah' : 'stuff')+
+                   (nodeAfter ? 'popsicle' : ''));
+
+        isConstant = false;
+        R.set('hi');
+        Meteor.flush();
+        // now we get the span!
+        test.equal(div.text(),
+                   (nodeBefore ? 'hi' : '')+
+                   'stuff'+
+                   (nodeAfter ? 'hi' : ''));
+
+        div.kill();
+        Meteor.flush();
+      });
+    });
+  });
+
+});
 
 })();