Improve error handling

test/specs/core/createError.spec.js

@@ -0,0 +1,11 @@
+var createError = require('../../../lib/core/createError');
+
+describe('core::createError', function() {
+  it('should create an Error with message, config, and code', function() {
+    var error = createError('Boom!', { foo: 'bar' }, 'ESOMETHING');
+    expect(error instanceof Error).toBe(true);
+    expect(error.message).toBe('Boom!');
+    expect(error.config).toEqual({ foo: 'bar' });
+    expect(error.code).toBe('ESOMETHING');
+  });
+});

test/specs/core/enhanceError.spec.js

@@ -0,0 +1,15 @@
+var enhanceError = require('../../../lib/core/enhanceError');
+
+describe('core::enhanceError', function() {
+  it('should add config and code to error', function() {
+    var error = new Error('Boom!');
+    enhanceError(error, { foo: 'bar' }, 'ESOMETHING');
+    expect(error.config).toEqual({ foo: 'bar' });
+    expect(error.code).toBe('ESOMETHING');
+  });
+
+  it('should return error', function() {
+    var error = new Error('Boom!');
+    expect(enhanceError(error, { foo: 'bar' }, 'ESOMETHING')).toBe(error);
+  });
+});

test/specs/core/settle.spec.js

@@ -58,7 +58,12 @@ describe('core::settle', function() {
     };
     settle(resolve, reject, response);
     expect(resolve).not.toHaveBeenCalled();
-    expect(reject).toHaveBeenCalledWith(response);
+    expect(reject).toHaveBeenCalled();
+    var reason = reject.calls.first().args[0];
+    expect(reason instanceof Error).toBe(true);
+    expect(reason.message).toBe('Request failed with status code 500');
+    expect(reason.config).toBe(response.config);
+    expect(reason.response).toBe(response);
   });
 
   it('should pass status to validateStatus', function() {