Move copy-to-clipboard to props of signMessageComponent

... for the sake of testability. Else copy-to-clipboard was opening
window.alert which failed the tests

src/components/signVerify/signMessage.js

@@ -1,9 +1,11 @@
 import { connect } from 'react-redux';
+import copy from 'copy-to-clipboard';
 import { successToastDisplayed } from '../../actions/toaster';
 import SignMessageComponent from './signMessageComponent';
 
 const mapDispatchToProps = dispatch => ({
   successToast: data => dispatch(successToastDisplayed(data)),
+  copyToClipboard: (...args) => copy(...args),
 });
 
 export default connect(

src/components/signVerify/signMessageComponent.js

@@ -1,7 +1,6 @@
 import React from 'react';
 import Input from 'react-toolbox/lib/input';
 import Button from 'react-toolbox/lib/button';
-import copy from 'copy-to-clipboard';
 import lisk from 'lisk-js';
 
 import InfoParagraph from '../infoParagraph';
@@ -32,7 +31,7 @@ class SignMessageComponent extends React.Component {
   }
 
   showResult() {
-    const copied = copy(this.state.result, {
+    const copied = this.props.copyToClipboard(this.state.result, {
       message: 'Press #{key} to copy',
     });
     if (copied) {

src/components/signVerify/signMessageComponent.test.js

@@ -1,12 +1,17 @@
 import React from 'react';
-import { expect } from 'chai';
+import chai, { expect } from 'chai';
 import { mount } from 'enzyme';
 import sinon from 'sinon';
+import sinonChai from 'sinon-chai';
+
 import SignMessageComponent from './signMessageComponent';
 
+chai.use(sinonChai);
+
 describe('SignMessageComponent', () => {
   let wrapper;
   let successToastSpy;
+  let copyMock;
   const publicKey = 'c094ebee7ec0c50ebee32918655e089f6e1a604b83bcaa760293c61e0f18ab6f';
   const signature = '079331d868678fd5f272f09d6dc8792fb21335aec42af7f11caadbfbc17d4707e7' +
     'd7f343854b0c619b647b81ba3f29b23edb4eaf382a47c534746bad4529560b48656c6c6f20776f726c64';
@@ -26,12 +31,24 @@ ${signature}
 
   beforeEach(() => {
     successToastSpy = sinon.spy();
-    wrapper = mount(<SignMessageComponent account={account} successToast={successToastSpy} />);
+    copyMock = sinon.mock();
+
+    wrapper = mount(<SignMessageComponent
+      account={account} successToast={successToastSpy} copyToClipboard={copyMock} />);
   });
 
-  it('allows to sign a message', () => {
+  it('allows to sign a message, copies sign mesage result to clipboard and shows success toast', () => {
+    copyMock.returns(true);
     wrapper.find('.message textarea').simulate('change', { target: { value: message } });
     wrapper.find('.sign-button').simulate('click');
     expect(wrapper.find('.result textarea').text()).to.equal(result);
+    expect(successToastSpy).to.have.been.calledWith({ label: 'Result copied to clipboard' });
+  });
+
+  it('does not show success toast if copy-to-clipboard failed', () => {
+    copyMock.returns(false);
+    wrapper.find('.message textarea').simulate('change', { target: { value: message } });
+    wrapper.find('.sign-button').simulate('click');
+    expect(successToastSpy).to.have.not.been.calledWith({ label: 'Result copied to clipboard' });
   });
 });