Merge pull request #264 from zaccolley/patch-1

Improved error message if results are unexpected

Author: NickColley

__tests__/index.test.js

@@ -218,7 +218,9 @@ describe("jest-axe", () => {
       const matcherFunction = toHaveNoViolations.toHaveNoViolations;
       expect(() => {
         matcherFunction({});
-      }).toThrow("No violations found in aXe results object");
+      }).toThrow(
+        "Unexpected aXe results object. No violations property found.\nDid you change the `reporter` in your aXe configuration?"
+      );
     });
 
     it("returns pass as true when no violations are present", () => {

index.js

@@ -123,7 +123,9 @@ function filterViolations(violations, impactLevels) {
 const toHaveNoViolations = {
   toHaveNoViolations(results) {
     if (typeof results.violations === "undefined") {
-      throw new Error("No violations found in aXe results object");
+      throw new Error(
+        "Unexpected aXe results object. No violations property found.\nDid you change the `reporter` in your aXe configuration?"
+      );
     }
 
     const violations = filterViolations(