add tests for view of delete button

scm-ui/package.json

@@ -32,7 +32,10 @@
     }
   },
   "devDependencies": {
-    "prettier": "^1.13.7"
+    "enzyme": "^3.3.0",
+    "enzyme-adapter-react-16": "^1.1.1",
+    "prettier": "^1.13.7",
+    "react-test-renderer": "^16.4.1"
   },
   "babel": {
     "presets": [

scm-ui/src/users/containers/DeleteUserButton.test.js

@@ -0,0 +1,54 @@
+import React from 'react';
+import {configure, shallow} from 'enzyme';
+import DeleteUserButton from "./DeleteUserButton";
+import Adapter from 'enzyme-adapter-react-16';
+
+import 'raf/polyfill';
+
+configure({ adapter: new Adapter() });
+
+it('should render nothing, if the delete link is missing', () => {
+
+  const user = {
+    _links: {}
+  };
+
+  const button = shallow(<DeleteUserButton user={ user } />);
+  expect(button.text()).toBe("");
+});
+
+it('should render the button', () => {
+
+  const user = {
+    _links: {
+      "delete": {
+        "href": "/users"
+      }
+    }
+  };
+
+  const button = shallow(<DeleteUserButton user={ user } />);
+  expect(button.text()).not.toBe("");
+});
+
+it('should call the delete user function with delete url', () => {
+
+  const user = {
+    _links: {
+      "delete": {
+        "href": "/users"
+      }
+    }
+  };
+
+  let calledUrl = null;
+
+  function capture(url) {
+    calledUrl = url;
+  }
+
+  const button = shallow(<DeleteUserButton user={ user } deleteUser={ capture } />);
+  button.simulate("click");
+
+  expect(calledUrl).toBe("/users");
+});