1 files changed, 8 insertions, 0 deletions
diff --git a/vnext/src/components/__tests__/MessageInput-test.js b/vnext/src/components/__tests__/MessageInput-test.js
index 65ec383d..1cf89ebf 100644
--- a/vnext/src/components/__tests__/MessageInput-test.js
+++ b/vnext/src/components/__tests__/MessageInput-test.js
@@ -14,6 +14,14 @@ const testMessage = {
     timestamp: new Date().toISOString()
 };
 
+window.matchMedia = window.matchMedia || function() {
+    return {
+        matches : false,
+        addListener : function() {},
+        removeListener: function() {}
+    };
+};
+
 it('Gives immediate focus on to textarea on load', () => {
     const wrapper = mount(<MessageInput data={testMessage} onSend={() => { }} />);
     const textareaRef = wrapper.instance().textarea;