Test that clear buffer is false

When changing restrictions, we don't need to clear the buffers. This tests
checks that when we change the config to change the ABR restrictions,
we do not clear the buffers.

Change-Id: I04e360c7fdfa008d7ae9a8050974bcd28f1d3388
Closes: #1009

test/player_unit.js

@@ -809,6 +809,43 @@ describe('Player', function() {
       .catch(fail)
       .then(done);
     });
+
+    it('does not clear buffers when restrictions change', function(done) {
+      var smallBandwidth = 200000;
+      var largeBandwidth = 1000000;
+
+      var smallDelay = 0.5;
+      var doNotClear = false;
+
+      var smallBandwidthSettings = {
+        abr: {restrictions: {maxBandwidth: smallBandwidth}}
+      };
+
+      var largeBandwidthSettings = {
+        abr: {restrictions: {maxBandwidth: largeBandwidth}}
+      };
+
+      var parser = new shaka.test.FakeManifestParser(manifest);
+      var factory = function() { return parser; };
+
+      var switchVariantSpy = spyOn(player, 'switchVariant_');
+
+      player.configure(smallBandwidthSettings);
+
+      player.load('', 0, factory)
+          .then(function() {
+            player.configure(largeBandwidthSettings);
+            // Delay to ensure that the switch would have been called.
+            return shaka.test.Util.delay(smallDelay);
+          })
+          .then(function() {
+            expect(switchVariantSpy).toHaveBeenCalledWith(
+                /* variant */ jasmine.anything(),
+                doNotClear);
+          })
+          .catch(fail)
+          .then(done);
+    });
   });
 
   describe('AbrManager', function() {