Attempts at fixing custom proptypes

proptypes.diff

diff --git a/packages/brigade-core/src/test/types/BrigadePropTypes_spec.js b/packages/brigade-core/src/test/types/BrigadePropTypes_spec.js
index 06a395a..26d3749 100644
--- a/packages/brigade-core/src/test/types/BrigadePropTypes_spec.js
+++ b/packages/brigade-core/src/test/types/BrigadePropTypes_spec.js
@@ -7,30 +7,34 @@ import BrigadePropTypes from '../../types/BrigadePropTypes';
 
 function typeCheckFail(declaration, value, message) {
   const props = { testProp: value };
-  const error = declaration(
-    props,
-    'testProp',
-    'testComponent',
-    'prop',
-    'testProp'
-  );
-  expect(error instanceof Error).toEqual(true);
-  expect(error.message).toEqual(message);
+  const error = PropTypes.checkPropTypes({
+    testProp: declaration,
+  }, props, 'prop', 'testComponent');
+  expect(console.error.mock.calls.length).toBe(1);
+  expect(console.error.mock.calls[0][0]).toBe(`Warning: Failed prop type: ${message}`);
+  console.error.mockReset();
 }
 
 
 function typeCheckPass(declaration, value) {
   const props = { testProp: value };
-  const error = declaration(
-    props,
-    'testProp',
-    'testComponent',
-    'prop',
-  );
-  expect(error instanceof Error).toEqual(false);
+  PropTypes.checkPropTypes({
+    testProp: declaration,
+  }, props, 'prop', 'testComponent');
+  console.log(console.error.mock.calls);
+  expect(console.error.mock.calls.length).toBe(0);
+  console.error.mockReset();
 }
 
 describe('BrigadePropTypes', () => {
+  beforeEach(() => {
+    //console.error = jest.fn();
+  });
+
+  afterEach(() => {
+    console.error.mockReset();
+  });
+
   describe('createDateOrDateStringTypeChecker', () => {
     it('should not warn when value is a valid Date representation', () => {
       typeCheckPass(BrigadePropTypes.DateOrDateString, new Date());
@@ -89,7 +93,7 @@ describe('BrigadePropTypes', () => {
   });
 
   describe('createJSONArrayOfTypeChecker', () => {
-    it('should not warn for valid json-array of', () => {
+    it.only('should not warn for valid json-array of', () => {
       typeCheckPass(BrigadePropTypes.jsonArrayOf(PropTypes.number), '[1,2,3]');
     });