Add test for delayResponse

Author: ctimmerm

src/index.js

@@ -22,7 +22,10 @@ function adapter() {
         config: config
       }, this.delayResponse);
     } else {
-      utils.settle(resolve, reject, { status: 404, config: config }, this.delayResponse);
+      utils.settle(resolve, reject, {
+        status: 404,
+        config: config
+      }, this.delayResponse);
     }
   }.bind(this);
 }
@@ -41,7 +44,9 @@ function MockAdapter(axiosInstance, options) {
   if (axiosInstance) {
     this.axiosInstance = axiosInstance;
     this.originalAdapter = axiosInstance.defaults.adapter;
-    this.delayResponse = options && options.delayResponse > 0 ? options.delayResponse : null;
+    this.delayResponse = options && options.delayResponse > 0
+      ? options.delayResponse
+      : null;
     axiosInstance.defaults.adapter = adapter.call(this);
   }
 }

test/basics.spec.js

@@ -229,4 +229,16 @@ describe('MockAdapter basics', function() {
     expect(mock.handlers['patch'].length).to.equal(1);
     expect(mock.handlers['post'].length).to.equal(2);
   });
+
+  it('allows to delay responses', function(done) {
+    mock = new MockAdapter(instance, { delayResponse: 1 });
+
+    mock.onGet('/foo').reply(200);
+
+    instance.get('/foo')
+      .then(function(response) {
+        expect(response.status).to.equal(200);
+        done();
+      });
+  });
 });