diff --git a/tests/unit/resources/methods.test.ts b/tests/unit/resources/methods.test.ts
index 69940336..a3b95809 100644
--- a/tests/unit/resources/methods.test.ts
+++ b/tests/unit/resources/methods.test.ts
@@ -22,7 +22,7 @@ describe('methods', () => {
     mock.onGet(`/methods/${methodId}`).reply(200, response._embedded.methods[0], {});
     mock.onGet('/methods/foo').reply(500, error, {});
 
-    it('should return a method instance', () => 
+    it('should return a method instance', () =>
       methods.get(methodId).then(result => {
         expect(result).toMatchSnapshot();
       }));
@@ -35,19 +35,19 @@ describe('methods', () => {
       });
     });
 
-    it('should throw an error for non-existent IDs', () => 
+    it('should throw an error for non-existent IDs', () =>
       methods
         .get('foo')
         .then(result => expect(result).toBeUndefined())
         .catch(err => {
           expect(err).toBeInstanceOf(ApiError);
-          expect(err.getMessage()).toEqual(error.detail);
+          expect(err.message).toEqual(error.detail);
         }));
 
     it('should return an error with a callback for non-existent IDs', done => {
       methods.get('foo', {}, (err: any, result) => {
         expect(err).toBeInstanceOf(ApiError);
-        expect(err.getMessage()).toEqual(error.detail);
+        expect(err.message).toEqual(error.detail);
         expect(result).toBeUndefined();
         done();
       });