added tests for error handler constructor

test/unit/index.html

@@ -100,6 +100,7 @@
           'specs/vislib/index',
           'specs/vislib/vis',
           'specs/vislib/handler',
+          'specs/vislib/_error_handler',
           'specs/utils/diff_time_picker_vals',
           'specs/factories/events',
           'specs/index_patterns/_flatten_search_response',

test/unit/specs/vislib/_error_handler.js

@@ -0,0 +1,42 @@
+define(function (require) {
+
+  var angular = require('angular');
+  angular.module('ErrorHandlerFactory', ['kibana']);
+
+  describe('VisLib ErrorHandler Test Suite', function () {
+    var ErrorHandler;
+    var errorHandler;
+
+    beforeEach(function () {
+      module('ErrorHandlerFactory');
+    });
+
+    beforeEach(function () {
+      inject(function (Private) {
+        ErrorHandler = Private(require('components/vislib/modules/_error_handler'));
+        errorHandler = new ErrorHandler();
+      });
+    });
+
+    describe('validateWidthandHeight Method', function () {
+      it('should throw an error when width and/or height is 0', function () {
+        expect(function () {
+          errorHandler.validateWidthandHeight(0, 200);
+        }).to.throwError();
+        expect(function () {
+          errorHandler.validateWidthandHeight(200, 0);
+        }).to.throwError();
+      });
+
+      it('should throw an error when width and/or height is NaN', function () {
+        expect(function () {
+          errorHandler.validateWidthandHeight(null, 200);
+        }).to.throwError();
+        expect(function () {
+          errorHandler.validateWidthandHeight(200, null);
+        }).to.throwError();
+      });
+    });
+
+  });
+});