diff --git a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_test.html b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_test.html
index 65d81bf..104c0c2 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_test.html
+++ b/polygerrit-ui/app/elements/diff/gr-diff-host/gr-diff-host_test.html
@@ -305,6 +305,7 @@
 
       // Stub the network calls into requests that never resolve.
       sandbox.stub(element, '_getDiff', () => new Promise(() => {}));
+      element.patchRange = {};
 
       element.reload();
       assert.isTrue(cancelStub.called);
@@ -368,6 +369,7 @@
             (changeNum, basePatchNum, patchNum, path, onErr) => {
               onErr(error);
             });
+        element.patchRange = {};
         return element.reload().then(() => {
           assert.isTrue(onErrStub.calledOnce);
         });
@@ -725,6 +727,7 @@
 
     test('delegates cancel()', () => {
       const stub = sandbox.stub(element.$.diff, 'cancel');
+      element.patchRange = {};
       element.reload();
       assert.isTrue(stub.calledOnce);
       assert.equal(stub.lastCall.args.length, 0);
@@ -1243,9 +1246,11 @@
 
       const l = document.createElement('div');
       l.setAttribute('comment-side', 'left');
+      l.setAttribute('line-num', 'FILE');
 
       const r = document.createElement('div');
       r.setAttribute('comment-side', 'right');
+      r.setAttribute('line-num', 'FILE');
 
       const threadEls = [l, r];
       assert.deepEqual(element._filterThreadElsForLocation(threadEls, line),
diff --git a/polygerrit-ui/app/test/index.html b/polygerrit-ui/app/test/index.html
index 6cdac42..f5a64dc 100644
--- a/polygerrit-ui/app/test/index.html
+++ b/polygerrit-ui/app/test/index.html
@@ -111,8 +111,7 @@
     'diff/gr-diff-cursor/gr-diff-cursor_test.html',
     'diff/gr-diff-highlight/gr-annotation_test.html',
     'diff/gr-diff-highlight/gr-diff-highlight_test.html',
-    // TODO: uncomment file & fix tests. The file was missed in this list for a long time.
-    // 'diff/gr-diff-host/gr-diff-host_test.html',
+    'diff/gr-diff-host/gr-diff-host_test.html',
     'diff/gr-diff-mode-selector/gr-diff-mode-selector_test.html',
     'diff/gr-diff-processor/gr-diff-processor_test.html',
     'diff/gr-diff-selection/gr-diff-selection_test.html',