diff --git a/.eslintrc.tests.json b/.eslintrc.tests.json
index 8b30046a0a..c4d31bc257 100644
--- a/.eslintrc.tests.json
+++ b/.eslintrc.tests.json
@@ -19,7 +19,6 @@
     "max-len": 0,
     "space-unary-ops": 0,
     "no-unused-vars": 0,
-    "no-unused-expressions": 0,
     "no-underscore-dangle": 0,
     "no-shadow": 0,
     "padded-blocks": 0,
diff --git a/tests/javascript/mochaTestHelper.js b/tests/javascript/mochaTestHelper.js
index 10e3b833af..81e1d99386 100644
--- a/tests/javascript/mochaTestHelper.js
+++ b/tests/javascript/mochaTestHelper.js
@@ -236,4 +236,4 @@ global.templates = {
   textInsertion: Handlebars.compile(jQuery('#newsletter_editor_template_text_widget').html()),
   textBlockSettings: Handlebars.compile(jQuery('#newsletter_editor_template_text_settings').html())
 };
-global.window.templates = global.templates;
\ No newline at end of file
+global.window.templates = global.templates;
diff --git a/tests/javascript/newsletter_editor/blocks/automatedLatestContent.spec.js b/tests/javascript/newsletter_editor/blocks/automatedLatestContent.spec.js
index 60486caae1..4e2a87de27 100644
--- a/tests/javascript/newsletter_editor/blocks/automatedLatestContent.spec.js
+++ b/tests/javascript/newsletter_editor/blocks/automatedLatestContent.spec.js
@@ -307,7 +307,7 @@ define([
       });
 
       it('listens to the event', function () {
-        expect(onStub).to.have.been.calledOnce;
+        expect(onStub).to.have.been.callCount(1);
         expect(onStub).to.have.been.calledWith('replaceAllButtonStyles', sinon.match.func);
       });
 
@@ -321,7 +321,7 @@ define([
           }
         };
         callback(data);
-        expect(model.set).to.have.been.calledOnce;
+        expect(model.set).to.have.been.callCount(1);
         expect(model.set).to.have.been.calledWithMatch(sinon.match.has('readMoreButton', data));
       });
     });
diff --git a/tests/javascript/newsletter_editor/blocks/button.spec.js b/tests/javascript/newsletter_editor/blocks/button.spec.js
index 0a595d6fd5..8b74b868c6 100644
--- a/tests/javascript/newsletter_editor/blocks/button.spec.js
+++ b/tests/javascript/newsletter_editor/blocks/button.spec.js
@@ -276,7 +276,7 @@ define([
       });
 
       it('listens to the event', function () {
-        expect(onStub).to.have.been.calledOnce;
+        expect(onStub).to.have.been.callCount(1);
         expect(onStub).to.have.been.calledWith('replaceAllButtonStyles', sinon.match.func);
       });
 
@@ -290,7 +290,7 @@ define([
           }
         };
         callback(data);
-        expect(model.set).to.have.been.calledOnce;
+        expect(model.set).to.have.been.callCount(1);
         expect(model.set).to.have.been.calledWithExactly(data);
       });
     });
diff --git a/tests/javascript/newsletter_editor/blocks/posts.spec.js b/tests/javascript/newsletter_editor/blocks/posts.spec.js
index 3318940900..2b191fc648 100644
--- a/tests/javascript/newsletter_editor/blocks/posts.spec.js
+++ b/tests/javascript/newsletter_editor/blocks/posts.spec.js
@@ -254,8 +254,8 @@ define([
         stub.restore();
         spy.restore();
 
-        expect(spy.withArgs('loadingMorePosts').calledOnce).to.be.true;
-        expect(spy.withArgs('morePostsLoaded').calledOnce).to.be.true;
+        expect(spy.withArgs('loadingMorePosts').calledOnce).to.be.true;// eslint-disable-line no-unused-expressions
+        expect(spy.withArgs('morePostsLoaded').calledOnce).to.be.true;// eslint-disable-line no-unused-expressions
         expect(model.get('_availablePosts').length).to.equal(3);
       });
     });
diff --git a/tests/javascript/newsletter_editor/components/save.spec.js b/tests/javascript/newsletter_editor/components/save.spec.js
index 7a45fe536d..dd192d38f5 100644
--- a/tests/javascript/newsletter_editor/components/save.spec.js
+++ b/tests/javascript/newsletter_editor/components/save.spec.js
@@ -33,7 +33,8 @@ define([
           }
         });
         module.save();
-        expect(spy.withArgs('beforeEditorSave').calledOnce).to.be.true;
+        expect(spy).to.have.callCount(1);
+        expect(spy).to.have.been.calledWith('beforeEditorSave');
       });
 
       it('triggers afterEditorSave event', function() {
@@ -54,7 +55,7 @@ define([
         });
         promise.resolve({ success: true });
         module.save();
-        expect(spy.withArgs('afterEditorSave').calledOnce).to.be.true;
+        expect(spy.withArgs('afterEditorSave').calledOnce).to.be.true;// eslint-disable-line no-unused-expressions
       });
 
       it('sends newsletter json to server for saving', function() {
@@ -188,7 +189,8 @@ define([
           view.render();
 
           view.$('.mailpoet_save_next').click();
-          expect(spy.withArgs('beforeEditorSave').calledOnce).to.be.true;
+          expect(spy).to.have.callCount(1);
+          expect(spy).to.have.been.calledWith('beforeEditorSave');
         });
 
       });