Isolate actions strategies in order to code improvement and programmatic usage. (#749)

* Isolate cut, copy and core helper functions.

* Update tests to accommodate new proposal

* Add/update tests

* Add tests to static copy/cut methods

* Update condition syntax based on PR reviews

* Migrate clipboard-action-default to functional approach. Update tests. Add tests

* Improve folder structure. Clean up code.

* Add types. Fix tsd check env. Improve in-code doc comments

* Improve in-code doc comments

test/common/command.js

@@ -0,0 +1,49 @@
+import select from 'select';
+import command from '../../src/common/command';
+
+describe('#command', () => {
+  before(() => {
+    global.stub = sinon.stub(document, 'execCommand');
+    global.input = document.createElement('input');
+    global.input.setAttribute('id', 'input');
+    global.input.setAttribute('value', 'abc');
+    document.body.appendChild(global.input);
+  });
+
+  after(() => {
+    global.stub.restore();
+    document.body.innerHTML = '';
+  });
+
+  it('should execute cut', (done) => {
+    global.stub.returns(true);
+    select(document.querySelector('#input'));
+
+    assert.isTrue(command('cut'));
+    done();
+  });
+
+  it('should execute copy', (done) => {
+    global.stub.returns(true);
+    select(document.querySelector('#input'));
+
+    assert.isTrue(command('copy'));
+    done();
+  });
+
+  it('should not execute copy', (done) => {
+    global.stub.returns(false);
+    select(document.querySelector('#input'));
+
+    assert.isFalse(command('copy'));
+    done();
+  });
+
+  it('should not execute cut', (done) => {
+    global.stub.returns(false);
+    select(document.querySelector('#input'));
+
+    assert.isFalse(command('cut'));
+    done();
+  });
+});

test/common/create-fake-element.js

@@ -0,0 +1,13 @@
+import createFakeElement from '../../src/common/create-fake-element';
+
+describe('createFakeElement', () => {
+  it('should define a fake element and set the position right style property', (done) => {
+    // Set document direction
+    document.documentElement.setAttribute('dir', 'rtl');
+
+    const el = createFakeElement(document.body);
+
+    assert.equal(el.style.right, '-9999px');
+    done();
+  });
+});