diff --git a/src/elements/legacy-element.html b/src/elements/legacy-element.html
index 08c09c18..9baae6e4 100644
--- a/src/elements/legacy-element.html
+++ b/src/elements/legacy-element.html
@@ -470,7 +470,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
         return this.root === node.getRootNode();
       }
 
-      scopeSubtree(container, shouldObserve) {
+      scopeSubtree(container, shouldObserve) { // eslint-disable-line no-unused-vars
         // TODO(sorvell): replace or remove when ShadyDOM library handles this.
         // if (!window.ShadyDOM && !window.ShadyDOM.inUse) {
         //   return;
@@ -788,7 +788,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
           var arr = Polymer.Path.get(this, arrayOrPath);
           index = arr.indexOf(item);
           if (index >= 0) {
-            return this.splice(path, index, 1);
+            return this.splice(arrayOrPath, index, 1);
           }
         }
       }
diff --git a/src/properties/property-accessors.html b/src/properties/property-accessors.html
index 57cba4c7..6ddac9f1 100644
--- a/src/properties/property-accessors.html
+++ b/src/properties/property-accessors.html
@@ -97,7 +97,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
         this._propertiesChanged(this.__data, changedProps, oldProps);
       }
 
-      _propertiesChanged(inst, currentProps, changedProps, oldProps) {
+      _propertiesChanged(inst, currentProps, changedProps, oldProps) { // eslint-disable-line no-unused-vars
       }
 
       _shouldPropChange(value, old) {
diff --git a/src/styling/custom-style.html b/src/styling/custom-style.html
index 01e79005..425d15ab 100644
--- a/src/styling/custom-style.html
+++ b/src/styling/custom-style.html
@@ -17,7 +17,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
   // can be made that loads custom-style and then polymer.
   if (window.CustomStyle) {
     var attr = 'include';
-    CustomStyle.processHook = function(style) {
+    window.CustomStyle.processHook = function(style) {
       var include = style.getAttribute(attr);
       if (!include) {
         return;
diff --git a/test/.eslintrc.json b/test/.eslintrc.json
index b210fb8f..f6ee2a64 100644
--- a/test/.eslintrc.json
+++ b/test/.eslintrc.json
@@ -5,6 +5,7 @@
   "globals": {
     "assert": true,
     "sinon": true,
-    "WCT": true
+    "WCT": true,
+    "fixture": true
   }
 }
diff --git a/test/unit/inheritance.html b/test/unit/inheritance.html
index 400094c9..e0f6a433 100644
--- a/test/unit/inheritance.html
+++ b/test/unit/inheritance.html
@@ -49,7 +49,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
   <dom-module id="child-el">
     <script>
     HTMLImports.whenReady(function() {
-      class ChildEl extends BaseEl {
+      class ChildEl extends window.BaseEl {
         static get is() { return 'child-el' }
         static get config() {
           return {
@@ -66,7 +66,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
   <dom-module id="grand-child-el">
     <script>
     HTMLImports.whenReady(function() {
-      class GrandChildEl extends ChildEl {
+      class GrandChildEl extends window.ChildEl {
         static get is() { return 'grand-child-el' }
         static get config() {
           return {
@@ -83,7 +83,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
   <dom-module id="child-el-with-template">
     <script>
     HTMLImports.whenReady(function() {
-      class ChildElWithTemplate extends GrandChildEl {
+      class ChildElWithTemplate extends window.GrandChildEl {
         static get is() { return 'child-el-with-template' }
         static get config() {
           return {
diff --git a/test/unit/polymer.element.html b/test/unit/polymer.element.html
index 5435116e..dbab1c09 100644
--- a/test/unit/polymer.element.html
+++ b/test/unit/polymer.element.html
@@ -85,7 +85,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
     <script>
     HTMLImports.whenReady(function() {
 
-      class SubElement extends MyElement {
+      class SubElement extends window.MyElement {
 
         static get is() { return 'sub-element'; }
 
@@ -180,7 +180,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
       }
     }
 
-    class SubMixinElement extends MyMixin(SubElement) {
+    class SubMixinElement extends MyMixin(window.SubElement) {
 
       static get is() { return 'sub-mixin-element'; }
 
@@ -234,7 +234,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
     <script>
     HTMLImports.whenReady(function() {
 
-      class SubNewTemplate extends MyElement {
+      class SubNewTemplate extends window.MyElement {
         static get is() { return 'sub-new-template'; }
       }
 
@@ -279,7 +279,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
     test('instanceof', function() {
       assert.instanceOf(el, HTMLElement);
       assert.instanceOf(el, Polymer.Element);
-      assert.instanceOf(el, MyElement);
+      assert.instanceOf(el, window.MyElement);
     });
 
     test('lifecycle', function() {
@@ -332,8 +332,8 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
     test('instanceof', function() {
       assert.instanceOf(el, HTMLElement);
       assert.instanceOf(el, Polymer.Element);
-      assert.instanceOf(el, MyElement);
-      assert.instanceOf(el, SubElement);
+      assert.instanceOf(el, window.MyElement);
+      assert.instanceOf(el, window.SubElement);
     });
 
     test('lifecycle', function() {
@@ -393,9 +393,9 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
     test('instanceof', function() {
       assert.instanceOf(el, HTMLElement);
       assert.instanceOf(el, Polymer.Element);
-      assert.instanceOf(el, MyElement);
-      assert.instanceOf(el, SubElement);
-      assert.instanceOf(el, SubMixinElement);
+      assert.instanceOf(el, window.MyElement);
+      assert.instanceOf(el, window.SubElement);
+      assert.instanceOf(el, window.SubMixinElement);
     });
 
     test('lifecycle', function() {
diff --git a/test/unit/polymer.legacyelement.html b/test/unit/polymer.legacyelement.html
index 1c99fd62..572bbea6 100644
--- a/test/unit/polymer.legacyelement.html
+++ b/test/unit/polymer.legacyelement.html
@@ -76,7 +76,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
     <script>
     HTMLImports.whenReady(function() {
 
-      class SubElement extends MyElement {
+      class SubElement extends window.MyElement {
 
         static get is() { return 'sub-element'; }
 
@@ -129,7 +129,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
       assert.instanceOf(el, HTMLElement);
       assert.instanceOf(el, Polymer.Element);
       assert.instanceOf(el, Polymer.LegacyElement);
-      assert.instanceOf(el, MyElement);
+      assert.instanceOf(el, window.MyElement);
     });
 
     test('lifecycle', function() {
@@ -165,8 +165,8 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
       assert.instanceOf(el, HTMLElement);
       assert.instanceOf(el, Polymer.Element);
       assert.instanceOf(el, Polymer.LegacyElement);
-      assert.instanceOf(el, MyElement);
-      assert.instanceOf(el, SubElement);
+      assert.instanceOf(el, window.MyElement);
+      assert.instanceOf(el, window.SubElement);
     });
 
     test('lifecycle', function() {
diff --git a/test/unit/shady-content.html b/test/unit/shady-content.html
index 208879d6..38380dc8 100644
--- a/test/unit/shady-content.html
+++ b/test/unit/shady-content.html
@@ -1013,7 +1013,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
       var div = document.createElement('div');
       div.innerHTML = '<x-dist><div></div></x-dist>';
       var h1 = div.firstChild;
-      var h2 = createPatchedDocumentFragment();;
+      var h2 = createPatchedDocumentFragment();
       document.body.appendChild(h1);
       CustomElements.takeRecords();
       ShadyDOM.flush();
diff --git a/test/unit/shady-dynamic.html b/test/unit/shady-dynamic.html
index a5b146ac..c4488c6e 100644
--- a/test/unit/shady-dynamic.html
+++ b/test/unit/shady-dynamic.html
@@ -865,7 +865,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
     assert.equal(c1.getAttribute('name'), 's1');
     assert.equal(c2.getAttribute('name'), 's2');
     assert.equal(c3.getAttribute('name'), 's3');
-    var ip$ = [c1, c2, c3];
+    // var ip$ = [c1, c2, c3];
     assert.equal(child.className, 'select-child');
     assert.equal(allInsertionPoints(child).length, 0);
     child.setAttribute('slot', 's1');
@@ -915,7 +915,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
     assert.equal(c1.getAttribute('slot'), 's1');
     assert.equal(c2.getAttribute('slot'), 's2');
     assert.equal(c3.getAttribute('slot'), 's3');
-    var ip$ = [c1, c2, c3];
+    // var ip$ = [c1, c2, c3];
     assert.equal(child.className, 'select-child');
     assert.equal(child.assignedSlot, null);
     child.setAttribute('slot', 's1');
@@ -1226,7 +1226,7 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
     var test = document.querySelector('x-test');
     var rere = document.querySelector('x-rereproject');
     var projected = document.querySelector('#projected');
-    assert.ok(testElement);
+    assert.ok(test);
     assert.notOk(rere);
     assert.notOk(projected);
   });