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scm-ui/jest.config.js

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+module.exports = {
+  collectCoverage: true,
+  coverageFormats: ["json", "html"]
+};

scm-ui/src/users/containers/EditUserButton.js

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+//@flow
+import React from "react";
+import type { User } from "../types/User";
+
+type Props = {
+  user: User,
+  editUser: User => void
+};
+
+type State = {};
+
+class EditUserButton extends React.Component<Props, State> {
+  render() {
+    if (!this.isEditable()) {
+      return "";
+    }
+    return (
+      <button type="button" onClick={e => this.props.editUser(this.props.user)}>
+        Edit user
+      </button>
+    );
+  }
+
+  isEditable = () => {
+    return this.props.user._links.update;
+  };
+}
+
+export default EditUserButton;

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

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+import React from "react";
+import { configure, shallow } from "enzyme";
+import EditUserButton from "./EditUserButton";
+import Adapter from "enzyme-adapter-react-16";
+
+import "raf/polyfill";
+
+configure({ adapter: new Adapter() });
+
+it("should render nothing, if the edit link is missing", () => {
+  const user = {
+    _links: {}
+  };
+
+  const button = shallow(<EditUserButton user={user} />);
+  expect(button.text()).toBe("");
+});
+
+it("should render the button", () => {
+  const user = {
+    _links: {
+      update: {
+        href: "/users"
+      }
+    }
+  };
+
+  const button = shallow(<EditUserButton user={user} />);
+  expect(button.text()).not.toBe("");
+});
+

scm-ui/src/users/types/UserEntry.js

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+type UserEntry = {
+  loading: boolean,
+  error: Error,
+  user: User
+};
+
+export type UserEntry;