1 files changed, 13 insertions, 0 deletions
diff --git a/frontend/jest.setup.js b/frontend/jest.setup.js
index 82edfc9..1783f17 100644
--- a/frontend/jest.setup.js
+++ b/frontend/jest.setup.js
@@ -2,3 +2,16 @@ import { configure } from 'enzyme';
 import Adapter from 'enzyme-adapter-react-16';
 
 configure({ adapter: new Adapter() });
+
+expect.extend({
+  toBeCalledWithVariables(received, argument) {
+    const receivedVariables = received.mock.calls[0][0].variables;
+    const pass = this.equals(receivedVariables, argument);
+    const message = () =>
+      `expected ${this.utils.printExpected(argument)} to match ${this.utils.printReceived(
+        receivedVariables
+      )}`;
+
+    return { message, pass };
+  },
+});