Fix for #410

Author: bmacheski

src/directives/formly-field.js

@@ -653,11 +653,11 @@ function formlyField($http, $q, $compile, $templateCache, $interpolate, formlyCo
   }
 
   function runApiCheckForType(apiCheck, apiCheckInstance, apiCheckFunction, apiCheckOptions, options) {
-    /* eslint complexity:[2, 8] */
+    /* eslint complexity:[2, 9] */
     if (!apiCheck) {
       return;
     }
-    const instance = apiCheckInstance || formlyApiCheck;
+    const instance = apiCheckInstance || formlyConfig.extras.apiCheckInstance || formlyApiCheck;
     if (instance.config.disabled || apiCheckFactory.globalConfig.disabled) {
       return;
     }

src/directives/formly-field.test.js

@@ -732,7 +732,7 @@ describe('formly-field', function() {
         });
       });
 
-      describe.skip(`formlyConfig.extras.apiCheckInstance`, () => {
+      describe(`formlyConfig.extras.apiCheckInstance`, () => {
         it(`should default to this instance when specified and no specific type instance is specified`, () => {
           const globalApiCheckInstance = apiCheck({
             output: {prefix: 'custom-api-check'}